After Flex Radio’s newest Signature series software defined radios hit the market there’s been a steady decline in value and interest in their original Flex series radios (Flex-5000, 3000, 1500).  The only one still marketed is the Flex-1500, and only time will tell how much longer it will last.  Flex now refers to these radios as their “legacy” series of radios and unfortunately has ceased developing software for them as well.  To the best of my knowledge the Flex-1000 was their first radio and is considered first generation SDR technology as it required a soundcard interface with the computer.


In spite of the excellent performance of the newest generation of SDRs on the market there still remains a dedicated core group of Flexers using their “legacy” radios.  Recently I’ve found a bit of good news for those who haven’t yet jumped ship to the current offerings available from Apache Labs or Flex Radio.  Darrin Kohn KE9NS has been developing an independent version of PowerSDR Ver. 2.7.2.  He has an entire page on his website devoted to his Flex-5000A and all items relevant to its operation.  I’ve heard rumor of one other ham doing a bit of software development, but Darrin’s is the best I’ve seen so far.  His improvements have been well done and easy to implement.  The upgrade is as easy as downloading the PowerSDR.exe zip file from his webpage and extracting it.  Rename the PowerSDR.exe file that currently resides on your local machine to something like PowerSDRbak.  You’ll also need to rename the config file as well since the latest version also upgrades the config file.  Drop this new file in the same folder where your current files reside.  It loads up without issues.  Darrin does recommend exporting the database just in case, but I haven’t experienced any issues.  The new file doesn’t change anything in the database.  He has the instructions on his Flex webpage as well.


This also makes all these older Flex radios on the market more of a value.  Current prices are very low compared to their original purchase price.  Mine was purchased in 2010 with a $100 “Dayton Discount” for $3100 which included the wide range antenna tuner, but without the second receiver.  I could probably buy one better than mine for half that now.  And performance is still on par with just about any current model offered by the mainstream manufactures.  Sherwood Engineering still ranks the Flex-5000A in the top ten based on receiver performance.


So far Flex Radio has been willing to work with independent developers like Darrin.  Their source code is available, but requires an email request.  In a recent correspondence with Tim Ellison W4TME, Customer Experience Manager of Flex, he directly told me that they encourage independent development of PowerSDR and see it as the primary reason many hams get involved in the hobby.  I sincerely hope that’s the case as they haven’t been apologetic in saying that they are done with developing the software and compare it to the depreciation of PCs as folks upgrade every few years when they get old.  In reality, the reason I purchased an SDR in the first place was the hope that as times change, so would the software.  Meaning that my radio wouldn’t be defined like the traditional knob and button rigs, but always evolving.  Now I sometimes wonder if we’re just one MS Windows OS away from failure.  At any rate, my station is running great on a Win 10 machine with one of Darrin’s custom versions so far.


The developers at HPSDR are doing a great job with their version of PowerSDR as well.  It’s actually based on older source code, but they have been able to implement some great features.  Two of which are CESSB and PureSignal active pre-distortion.  The CESSB cleans up the audio on the mic side of the rig and actually results in higher average power output.  PureSignal cleans up the output side generating a signal with much lower IMD and harmonic suppression.  Hopefully some of the features can be shared between these two.  For now I’m glad that there are hams like Darrin who continue to develop PowerSDR for legacy Flex radios such as my Flex-5000A.  He’s currently up to Ver. 2.7.2 R12.


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It’s been a long and busy summer and my blog has suffered.  I’ve neglected amateur radio quite a bit due to a heavy work schedule.  With the onset of Indiana winter and the first snow on the ground I may be able to carve out a little more shack time now.  I’ll try to do a quick recap of the last five month and hit any ham radio highlights.

We were sorely in need of some better antennas and feedline at the WD9BSA shack.  We were able to trade off some excess equipment for a 500 foot spool of LMR-400 feedline.  This allowed us to make brand new runs out to the antennas.  We now have two multi-band antennas in the air and ready to go whenever the Scout radio station is activated and on the air.

Unfortunately, I missed Field Day this year because of work.  I was able to operated portable Field Day style at Ransburg Scout Reservation.  After a more than twenty year absence from Boy Scout camp, I returned with my oldest son, Jared, for a week in July.  I had a portable station setup in the STEM area and managed several contacts.  The station included a Buddipole antenna and an older Kenwood TS-450SAT with matching power supply.  Some contacts of interest were:  W100AW ARRL Centennial station, W9ZL special event station at EAA Airventure, and DX station CO6LC in Cuba.  Our troop’s Senior Patrol Leader earned his ham license so we were able to communicate throughout camp with HT’s.








I have numerous old boatanchor radios in the shop.  They’re in various stages of disrepair, unfortunately.  I was, however, able to get two of them fired up using a variac.  The two I’ve been working on are a Hallicrafters S-53A and Hammarlund HQ 100A.  They both exhibit some audio hum and could use some refurbishing, but so far they receive pretty well on a wire antenna.  The S-53A now rests on the mantle in my family room and is occasionally fired up for a little AM listening enjoyment.IMAG0146[1]

My most recent project is getting the shack cleaned up for winter operation.  I’ve moved around a bunch of gear to improve the overall layout.  Some items have been packed away for a later date and new projects are on the bench.  I built a new shack computer to operate the Flex-5000 and all the software that goes along with modern radio operation.  In the last couple days it’s been getting a workout on 10m due to some decent propagation to Europe.  I have more ham blog goodness on the way…but that’s a teaser to keep you coming back.  73 for now.

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My home digi in operation.

My home digi in operation.

For a long time I thought that APRS was pretty much a solution to a nonexistent problem.  It provides position tracking, but how many times can you follow your buddies around on a map before that gets boring?  It uses a 1200 baud packet radio protocol, but most packet has been dead for years.  The only exceptions are a few DX cluster nodes and some emcomm stuff.  And even at that, 1200 baud is slow when most any gear can run 9600 now.  So, what’s the attraction?

My thoughts changed after tracking a high altitude balloon.  APRS really proved itself invaluable in this endeavor.  We were able to not only copy direct packets from the balloon, but also see the beacon packets on using a smart phone when we were out of range.  This made recovering the payload much easier–of critical importance when there’s the potential for a high altitude to travel outside of state lines and beyond.

At some point the location beacons stop getting reported to the APRS-IS network if it gets out of range of a digipeater.  The last two times it was when the balloon was still 2-3000 feet up.  This prompted me to examine how many digipeaters were in my local area.  I live directly between two fairly large cities.  Indianapolis and Lafayette both have wide area digipeaters but there aren’t any local digi’s in my area.  Just one I-gate in Lebanon.  I thought it might be nice to set one up.  This should help provide coverage for local passing motorists and may be of help to the local ARES team in the future.  Just last fall we had a destructive tornado come through my county only 10 miles away!

I’ve done a lot of reading on different ways to setup digi’s and I decided to purchase an older Kenwood TM-D700.  This dual band data radio will operate APRS on one VFO and also VHF or UHF FM phone on the other VFO simultaneously.  This is different than many dual banders that will operate phone on both bands, but not data and phone at the same time.  The added benefit is that I now have a handy radio in the house for repeater/simplex operation.  It was easy to setup the APRS features and get the packets beaconing.  Then I enabled it to digipeat local WIDE1-1 packets and saved this config to one of the Programmable Memories.  Phase two involved taking the digi to the next level.  I downloaded

The guts of the system are housed in this box under the table.

The guts of the system are housed in this box under the table.

aprsisce/32 on my spare laptop.  I had to make a couple changes to the xml file and then it would operate as a digi.  Then I changed the 700 to run as a KISS TNC and connected it to the laptop.  This proved simple once I found correct straight through F/F serial cable.  The 700 still has an old school DB9 male serial port so I didn’t have to construct a special serial cable with a mini DIN connector like the newer TM-D710 requires.  After making all these changes I saved the config to another Programmable Memory channel.  Now my digi can operate stand alone or with the laptop.  Using the laptop is nice since it shows all the activity in the area and also handles APRS messaging.

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I have a feeling this is going  to be a long blog post.  But hey, sometimes I have a lot to say.  Occasionally, it’s even interesting.  If you like older Kenwoods or just playing around with different rigs, then this will be for you.  It’s not really a product review, just some general observations.

TS-450Over the weekend I hooked up a nice, old Kenwood TS-450SAT.  This is one of the radios I got from Mark Quebe N9EKG over the summer.  Some readers of this blog will remember my previous post on this adventure.  Sure was glad to have Dad and my sidekick Nick N9SJA there for the long day of work.  Initially, I’d hooked the radio up just to try it out and didn’t have spectacular results.  I could hardly make it work at all.  With disappointment I’d packed it away for another day.  Having  nothing better to do, I hooked it all back up again.  I think the cabin fever is setting in.  What I found out is that it seems to receive quite well, but has very little AF output.  This is likely something easily fixed.  Even better, it was now showing full power output into the dummy load.  I don’t remember it working at all last time so maybe it’s had some group therapy sessions in the shack with the other gear I’ve banished to the shelves.  Either that or reading the operator’s manual has paid off.  I don’t know which?

I attached an MC-60 mic and hooked it up to the hexbeam for some real testing.  This proved to be successful as I made several contacts on 17m, including DX.  For a smaller radio it has a good, solid feel to it.  Kenwood built some quality into these back in the day.  In spite or converting to a Flex-5000A as my main shack radio, I still love to spin the dial and push buttons.  But what to do about rig control?  I’ve gotten used to having all my gear interfaced to the computer with the Flex.  I had to keep reminding myself to manually input band, freq, mode, etc into the HRD logbook.  Then I remembered USB interfacethis USB rig interface kit I built years ago for an original Icom IC-756.  It was designed by N0XAS HamGadgets.  Sadly, it’s no longer produced, but it worked quite well on the 756 and also a Yaesu Ft-736R.  After I dug it out I found that it even had the correct 6-pin DIN plug on it for the TS-450, and it was wired correctly!  When you’re hot, you’re hot.  After a little bit if research I found that Kenwood used inverted TTL for their serial rig control.  I can’t even guess why they would do that other than to be different.  This normally requires buying their interface box or a homebrew lashup with opto-isolators and such to deal with the inverted logic.  Fortunately, the rig interface had a utility program on the software disk called MProg.  It allows you to change the settings and configuration for the FTDI chip and then flash them to it.  It worked quite well and I’m pleased to report that the radio is now communicating happily with the HRD suite.

Other than having to run the AF gain all the way up I’m pretty pleased with this radio’s performance.  The antenna tuner seems to be jammed up so I don’t use it.  Maybe when I dig into the low audio issue I can check out the tuner, too.  As I’ve researched it on the web there are very few known issues requiring mods.  That says a lot about the radio’s design.  It’s not fair to compare it with the Flex but it does perform solid.  I could improve it a little by adding better filters and maybe a Heil mic.  International Radio has an excellent assortment of them available.  Unfortunately, I could spend more than the radio’s worth on filters!  It’s still going to be an early ’90s compact HF transceiver, though.  I don’t want to try and make it more than what it is.  I think I’ll just enjoy it for now…and then on the the next project!

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TMD700New year, new projects.  Trying to kick off 2014 in grand style.  I’ve been so busy working on ham radio projects I’ve hardly even gotten on the air.  My online logbook looks pittiful!  Projects are really enjoyable for me…and often are very good learning experiences.  But I do miss making radio contacts.  One of my recent projects involves setting up an APRS digipeater.  Not a wide area one like in big cities, but something local that will help get packets from mobile or low power stations out to the bigger stations and onto the world wide networks.  This interest all started back in November when my buddy Nick N9SJA and I went chasing a high altitude balloon that had APRS tracking.  You can read about that adventure in my previous post.

I’m happy to say that the project is successful and fully operational.  However it’s potential is not yet fully realized.  I feel like I’ve just begun and have so much to learn about best practices and proper setups for a local digipeater station.  My choice of radio is a Kenwood TM-D700.  This radio is no longer in production, having been replaced by the TM-D710, but it’s still a good radio and available at a discount used.  It’s mounted in my family room and connected to a dual band J-pole antenna in the attic.  The antenna is one of those homebrew arrangements constructed from a piece of 450 ohm ladderline.  The nice thing about the Kenwood is that it has built in APRS capabilities that can operate on one band of the radio while letting the other band function for normal voice duty on 2m/70cm, simultaneously.  Right now this is a very simple arrangement.

The D700 has a serial port on the front of the radio that will allow it to interface with a computer.  This will allow you to get a visual on what the radio is hearing.  One of the programs I’ve used for this is called APRSISCE/32.  It can operate as a monitor only or can actually control the radio.  After getting a passcode, it’ll allow you to beacon packets from the radio and also directly to the APRSIS network if connected to the internet.  With some modification to the XML file it will also act as a digipeater.  So now I have multiple options on how I wish to operate the station.  An added bonus is now I can monitor local simplex and repeaters without having to go out to the shack.

So where do I go from here?  I think I’ll mount it all in a box and do a little cable management so it looks better in the main room of the house.  I also think it would benefit from having a backup power supply in case of power outages.  This happened just last fall when a tornado ripped through my part of the county.  It’s my hope that the local ARES/Skywarn volunteers might be able to make use of my digipeater when needed.  When the weather gets up somewhere above freezing I plan to construct a new and improved antenna and locate it outside for better coverage.  This attic antenna is deaf compared to the Diamond X500 I have connected to the dual bander in the shack.  Crossband repeat might also be handy as I have a couple dual band HTs that could be pressed into service.  A final option is to setup different operating modes using the Kenwood Programmable Memory function for each scenario.  This allows for five completely different setups that can be programmed into preset buttons on the radio control head.  I’ve rambled on long enough.  Stay tuned for another upcoming project blog coming soon.  After that I may get around to making some contacts!

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Everybody wants good audio.  I know we’re not DJ’s and communications grade audio is from 300-3000 Hz according to Bell Labs, blah, blah, blah.  Even if we’re not on the cutting edge of high fidelity it’s still important to be clearly understood.  I bet even those guys who claim the don’t care are still pleased if they get an unsolicited comment of clean audio.  At some point many hams will decided they want to do something a little better than a stock hand mic.  There are many good mics out there and inexpensive mixers that can be added into the equation.  There are plenty of people out there running full pro audio setups and pushing the limits of the 3 KHz SSB signal, too.

One of the nice features of the Flex Radio and PowerSDR is the ability to tailor the transmit audio.  My Flex-5000A has line level and mic level balanced and unbalanced inputs.  The software also has a leveler, 10 band EQ, two different compression options and a downward expander.  Fortunately, it also has the metering to allow you to set these items correctly.  This is quite important as these are digital stages in the radio and will cause distortion if over driven past the 0 dBm level.  When each stage of the audio chain is properly adjusted there should be nothing but clean audio transmitted.

Flex Radio has a pretty good internet knowledge base as well as a couple email reflectors to help us out.  They also have a pretty good owners manual to assist in configuring the radio.  Audio seems to be something of a fuzzy area, though, to many of us who haven’t worked in the business.  We kinda know how we want it to sound but not necessarily how to get it that way.  We know we shouldn’t over drive or over compress it but we want to be heard over the noise.

Nige Coleman G7CNF has recently posted a few PowerSDR tutorial videos on Youtube since the newest version 2.6.4 was released.  It’s fairly long, but I guarantee you’ll learn something from it.  Of course it’s geared toward audio setup of a Flex-5000A using all the PowerSDR features.  He makes very good examples and clearly displays how and why he’s changing settings.  At the end…wow, what a difference!  I only hope I have mine setup that good.  If you have the time I can recommend it.  Enjoy the show.

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A couple years ago my parents’ not-so-old Dell crapped out on them.  They ended up replacing it and getting it fixed up for my dad’s man cave.  Well, Dad’s resurrected desktop died again last weekend.  Fortunately, he decided to buy a new one rather than spend any more cash on the old one.  I helped him set it all up and get the basic configuration going. For my reward I kept the old one.  Jared and Logan helped me disassemble it and rob the useful parts.  Once I got it open I found the reason for failure–many popped caps on the mobo.  Who knows what else might be bad.  I was able to salvage 2GB DDR2 memory, Intel CPU and a cooler assembly with a couple fans, 250GB HDD, video card, and a power supply.  I’m not really sure what to do with the case.  It’s fairly heavy duty.

The kids don’t really use my old Gateway desktop anymore.  I turned it into a linux box years ago after the Windows rot kicked in on the Vista OS.  Mainly it just sits around.  I decided it needed a new life.  I’ve been wanting a NAS box here at home for file storage.  Something network accessible rather than just an external USB HDD.  The factory units are pretty expensive and building up a dedicated machine, though powerful, would be even more so.  Price and quality seems to be all over the place on external HDDs and NAS boxes.  I managed to stumble across a cool piece of freeware on the net called FreeNAS.  It will turn an old desktop or just about any machine into a capable server.

The program works by loading the open source FreeBSD OS onto a 4GB flash drive.  After setting the BIOS to boot from the flash drive it allows the entire capacity of all HDDs connected to the mobo to be used for storage.  Pretty clever arrangement.  It has a lot of feature on what type of file system to use, configuring sharing, global settings for access by the web, and plugins.  It will even do multi-disk RAID arrays of multiple types.

I configured one HDD to be a backup location and mapped it as a network drive.  Now my computer backs up the whole system disk to one HDD.  The other HDD is setup for storing media.  I can now save all my episodes of and Ham Nation to it, or any other videos I like, without filling up the HDD on my desktop.  This is nice since I like to view the HD versions that are around 1GB file size.  I loaded a program called minidlna on there and it will stream the videos to my Blu-ray player so I can watch them on the TV.  It’s been a little challenging to get it all working but I’m pleased that it’s been a successful learning experience.

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Now that it’s February and well into the new year I might as well get around to making some resolutions.  Not really resolutions so much as an attempt to set targets for a variety of projects I attempt each hear.  2013 is no different.  I only have the cash to fund some of them but you just have to do your best.

One of the things I’ve been busy with lately is the WD9BSA Memorial Scout Radio Station.  It’s located at Camp Belzer in Indianapolis.  I just recently became active with the group, but the other dedicated members have been working on it for over two years.  Tabb, W9TTW, has been helping me with this, and together, we’re launching a social media blitz to try to get the word out about it.  We’re also the only ones who know much about digimodes so we’ve made it our mission to get those up and running in the station as well.

Here at my home shack I’ve been busy updating the computer to the latest and greatest new software for the Flex5k.  This has been surprisingly painless, and each new upgrade yields new features or better performance.  Going along with this theme is an upgrade to Ham Radio Deluxe Ver. 6.  I paid for the subscription to the new version when it becomes available.  I have it downloaded but not yet installed.  It’s still a Beta, but nearly ready for release.  I’m looking forward to taking it for a test drive.

For projects I’m planning a tape measure beam.  One of the events we’d like to plan for the WD9BSA station is fox hunt.  It would be a good outdoor activity for the boys that incorporates radio and physical activity.  There are a lot of plans for these and parts are cheap.

One last item is to recreate a solid state linear amp from an article in the Oct. 2012 QST.  It only uses one transistor in the PA and is good for up to 1kW.  The one in the article was for 2m EME use but the transistor is very broad banded and there’s no reason it can’t work on HF.  With proper low pass filtering on the output, I think it would make a great no-tune amp for the shack.

FreeDV is another item I might actually get going fairly quickly.  Since it’s really just software it shouldn’t require too much in the way of construction and building.  I found out about it from a post on the Flex Radio Reflector while back.  Then I saw further discussion about it on Episode 47 of Ham Radio Now.  It was the topic of one of the talks from the TAPR/ARRL DCC conference.  Nick, N9SJA, beat me to the punch on getting it up and running.  We hope to experiment with it some here locally, maybe on 6m SSB.  You can see his impressions of the software so are at his webpage here.

That’s all for now, folks.  This should be enough to keep me busy for years to come!  It also breaks a two month streak without a post.  All the best!

de n9iz

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Lots of stuff in this post.  Really should be three posts but everything is pretty much intertwined.  I guess this is what happens when you wait too long between posts…too much stuff!  Consider yourself forewarned.

I’ve been contemplating an antenna project for quite some time.  I recently attached a fiberglass cross bar on my tower with pulleys and rope in hopes of raising something interesting.  I’ve actually had it since I put the tower up but just never got around to attaching it.  The idea was that I could easily raise and lower a project antenna because of the pulleys.  I still have a lot of interesting ideas but with winter upon us it was time to act.  I decided to buy a Carolina Windom 80 from Radio Works.  I guess it’s really just a hybrid off-center fed dipole that’s supposed to work all bands with a tuner.  It has some kinda special matching balun and line isolator to allow part of the feedline to radiate while also keeping RF out of the shack.  It was supposed to go in the top of the oak tree at about 65′ but there were too many uncooperative branches.  For now it’s pretty happy at about 38′ from the tower cross bar.  Thanks a lot to Tabb and Nick.  Time will tell how this works.

I’ve had the FT-897D complete radio station in a go box since the trip to Dayton this year.  There’s a post about it somewhere down in the previous blogs.  Until now it’s been sitting in my shack playing second fiddle to the Flex 5k.  Now it resides in my family room with the server and old desktop computer to keep it company.  It’s actually a nice fit in this location.  I’ve had a radio in here before but due to little children it had to get relocated for its own protection.  The boys are older now and somewhat interested in the thing.  For now it’s something of a fascination for them.  This may be just the right time to introduce them to the magic of ham radio.  Since I have a new antenna and plenty of feedline why not hook it up to the go box radio in the house?

This is where the linux stuff comes into play.  Now that I have the nice, new antenna connected to a suitable radio station I need a way to log and also run digimodes.  I could just use my old paper log but this is the 21st century, right?  I carry a radio all day at work so it’s nice to work digimodes and not have to talk…or even listen since all there is to hear is tones.  They’re pretty efficient and seem to overcome the local noise I get due to having power lines around three sides of my house.  Several years ago I converted my old Gateway desktop to a linux box.  It’s currently running the latest version of Ubuntu.  I was going to need some linux-friendly software for logging and digimodes.  I was able to install a logging program called CQRLog (CQRL) that reads the band, mode, frequency, etc from the radio and also completes logging fields using lookups once the callsign has been entered.  It’s nowhere on the scale of Ham Radio Deluxe (HRD) but about as good as it gets for linux.  For digimodes I installed Fldigi.  Something neat I found is that it works with CQRL similar to how Digital Master 780 works with HRD.  All I have to do to go from operating SSB or CW to digimodes is select Remote Mode in CQRL and it automatically opens up Fldigi.  CQRL goes into an offline mode and accepts all logging fields and radio parameters directly from Fldigi.  I’m pretty impressed!  As usual with linux the install was a little quirky.  I could get the programs from Ubuntu’s software repo’s but they weren’t the most current.  I ended up having to do some manual installs.  Also had to open a terminal window and work with the command line.  Still not bad for free stuff that actually works.  I usually end up learning something in the process, too.

So this takes up us back to the beginning…how’s it work?  The 10M band was open all weekend.  Since this antenna isn’t really resonant there I figured it would be a good test.  Well, the LDG AT-897 Plus tuned it right up.  Was able to work Brazil and also a strong station in California that was part of a 10-10 special event station.  Switched to 20M and worked a strong station in Michigan on psk-31.  He helped me get the transmit level set on the SignaLink USB so it wasn’t overdriving the waterfall display.  Well, there’s three QSO’s on two bands.  It’s a good start.  Jared seems to be interested in what I’m doing.  He even made his own lego radio to set next to mine.  All is well in the world for now….



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One of the nice things about the Flex 5k is the way audio inputs/outputs can be interfaced.  The front mic connector is just the beginning.  On the rear of the chassis is a jack for a true balanced mic input as well as RCA jacks.  Since I purchased it I’ve been using a Heil PR-781.  This is a balanced studio grade mic that has been optimized for high end amateur radios.  Up until now I’ve just been using Heil’s mic cable that goes from XLR to the front mic jack.  This basically converts the balanced mic to the unbalanced front connector.  With the Heil foot switch attached I found that I’d get RF into my audio on 17m.  The addition of ferite beads cut this down but it has always bothered me a bit.

I recently decided to purchase a new balanced mic cable.  This one has the required XLR plug on the mic end and the 1/4″ TRS plug on the other end that goes into the back of the radio.  I can still use the foot switch as it will plug into the back panel, too.  I’m hoping this will be a nice improvement for my station.  This will also give me an excuse to go back through the mic setup procedure and verify all my levels are correct.  The audio capabilities in the Flex are extensive if one desires to go through all of them.

I know, I could’ve built this cable up myself from pieces.  I’m sure it would be cheaper for a couple connectors and a few feet of mic cable.  However, this has left me time for some summer fun activities.  We went to the Extreme Flight Championship for R/C planes and heli’s.  Jared’s plane is fully flightworthy and he’s made several flights with the 4H club.  I also found time for some minor repairs to the model rocket launcher.  Summertime fun is some good stuff!

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