Two Meter Transverter with FLEX-6500 Questions

  • 1
  • Question
  • Updated 1 year ago
  • Answered
Good day, fellow hams! With respect to this thread's title of "Two Meter Transverter with FLEX-6500 Questions," I have searched for, found and read quite a few posts here about two meter transverters and the FLEX-6500. Quite a bit of good information has been shared.

The transverters that I am looking at are:

-  UT5JCW Assembled Transverter with Enclosure
- Down East Microwave Transverter with Enclosure
- Elecraft Transverter with Enclosure
- Kuhn Transverter with Enclosure

Prices range from about $125 up to $500 which is a pretty big spread. Now here is what I hope to do with the two meter transverter:

- Plug and Play (PnP) connectivity to the FLEX-6500, i.e. a tested and proven interface.
- Enable data transmissions on two meters via DAX on the FLEX-6500 and the appropriate terminal software.
- Operations will be on USAF MARS networked two meter repeaters in the Pennsylvania, Maryland and Virginia areas initially. Ultimately, operations will extend up to Maine as more Region 1, Region 2 and Region 3 repeaters are interconnected.
- USAF MARS frequencies are below the Amateur two meter band for receive and above the Amateur two meter band for transmit with a split of around 5 MHz.

QUESTIONS:

  1. The UT5JCW transverter is very low cost (about $125) compared to other transverters in the $400 to $500 range. Obviously, there must be some features in the more expensive transverters that are not offered in the UT5JCW transverter. Has anybody analyzed these transverters and tabulated the differences in the four transverters listed?
  2. Does anybody have any of these transverters operational on MARS frequencies outside of the Amateur bands? If you do, please indicate how far below and how far above your transverter can go outside of the Amateur two meter band.
  3. Does anybody have operational data modem software using the DAX capabilities of the FLEX-6500 and is successfully transmitting and receiving data transmissions? If you do, please reply with which mode(s) that you have successfully used for data transmissions. USAF MARS uses proprietary software with encryption that is easily passed via HF using the FLEX-6500. I want to expand this capability to two meters using the same software.
  4. Finally, does anybody have a block diagram of your setup and/or a set of instructions with FLEX-6500 settings to do the above that you could either post or eMail to me?
Thanks for your time in reading this post and know that I will greatly appreciate any help that you can offer regarding my four questions. Please know that I am disabled with semi-quad paralysis that prevents me from building kits. I also have cognitive issues due to a terminal illness that I have (MELAS) so I tend to get things mixed up a bit. That is why I am looking for a PnP solutions with written instructions to get everything to play nice together.

For the FlexRadio engineers that are reading this, the ideal solution would be a single part number that I could order from FlexRadio to accomplish the above. FlexRadio could handle this like the Linear Amplifier that was recently added to the product lineup. Having a FlexRadio approved system would be an ideal scenario for me.

73, Dave Hamm, K4EET
Photo of Rev. David E. Hamm, K4EET

Rev. David E. Hamm, K4EET

  • 83 Posts
  • 13 Reply Likes
  • great!

Posted 1 year ago

  • 1
Photo of Ria - N2RJ

Ria - N2RJ, Elmer

  • 2254 Posts
  • 879 Reply Likes
Hi Dave,

The DEMI transverters are basically plug and play as they design them specifically for Flex, and Flex also has SSDR support for them. However, any transverter will work because SmartSDR is very flexible in its support for them. 

I am not 100% sure about the Kuhne transverters because they all seem to be for 144-146MHz and not 144-148. Maybe you an ask them to do something custom. Maybe DEMI can also do something custom for your MARS needs. 

I and others use all kinds of data modes on the flex, including WinMOR. As long as the software has a sound card output it will work via DAX. 
Photo of Ryan - NC4RA

Ryan - NC4RA

  • 43 Posts
  • 7 Reply Likes
I was going to order the new DEMI 2MLDPA but for some reason it will only work with the 6700 and not my 6500....
Photo of David Warnberg

David Warnberg

  • 538 Posts
  • 56 Reply Likes
Ryan, that is a 2m 75 watt power AMP\LNA module... a transverter for the 6500 would be the L144-28 or the L144-28CK for the 25 watt model or you could go with the L144-28HP ...

But call them as I'm as sure they can help you with any of your questions and suggest a model that fits your needs..

No I am not a DEMI rep.. I have Elecraft Transverters

Good Luck
Photo of Ryan - NC4RA

Ryan - NC4RA

  • 43 Posts
  • 7 Reply Likes
Ok David that makes sense now. Thank you for the clarification !
Ryan
Photo of David Warnberg

David Warnberg

  • 538 Posts
  • 56 Reply Likes
David.... check the MARS frequencies against what the usable transverter band width...

example: the elecraft transverter when aligned as described in the manual the usable frequency range is 144 - 146 MHz and the power output (20 watts) will fall off sharply outside of that range.  So the alignment will be for the transmit side, receive is not an issue outside the ham bands.

So with that in mind whatever transverter you purchase be sure to have it aligned with the center frequency were you will be operating mainly otherwise you will get zero output. 

I am a MARS operator in Florida and I do have a local MARS repeater, however I am using my transverter for SAT and local repeater work mainly.  I modified a Kenwood TM-281 for my local repeater MARS work.. but I could re-align my Elecraft Transverter to operate in the frequency range needed.

Hope this helps

P.S. as far as digital modes with the 6500 and transverter it will work fine

David
(Edited)
Photo of David Warnberg

David Warnberg

  • 538 Posts
  • 56 Reply Likes
FYI.. I did a quick test... I can verify the elecraft transverter will work when transmitting below the HAM frequencies... quite well actually
Photo of David Warnberg

David Warnberg

  • 538 Posts
  • 56 Reply Likes
David.. I truly wish you were closer to me... Region 4 MARS here.. do you have someone that can assist you?  As long as you are not in any hurry I would be happy to build the XV144 Elecraft Kit for you if that is a direction you would like to persue.  With my current work schedule it would take me close to a month to complete it with alignment and testing.

My e-mail is good on QRZ.. call sign KK4QOE
Photo of Greg AB4GO

Greg AB4GO

  • 3 Posts
  • 0 Reply Likes
I have a set of the UT5JCW transverters for 2m and 70cm.  I can verify that they have good sensitivity and rated RF power output.  I have not had time to use them on the air.  They are a good value.  I look forward to using them in AMSAT communications using our Quadrifilar Helical Antennas. 73, Greg AB4GO
Photo of David Ahrendts

David Ahrendts

  • 80 Posts
  • 10 Reply Likes
Greg, I'd love to know more about how you will set up the two transverters for sat work. I assume you'll run both concurrently with one 2m waterfall and one 70cm waterfall?  David A., KK6DA, LA
Photo of David Warnberg

David Warnberg

  • 538 Posts
  • 56 Reply Likes
Take a look at this artical, very good info on using the Flex with transverters for a full duplex SAT setup...  

https://helpdesk.flexradio.com/hc/en-us/articles/206972363-A-Full-Duplex-VHF-UHF-Satellite-System-us...

Same principal for the Flex Signature radio's...  

I've set my up a little different.. just 2 switches (RX and TX) instead of 3, key is setup as a profile to key 70cm or 2 meters and using SatPC32..

Anyway I know you asked Greg...

73's

David
Photo of KENT HUFFORD

KENT HUFFORD

  • 65 Posts
  • 9 Reply Likes
I have the 2m UT5JCW 2m kit. Works fine on 2m repeaters and even DSTAR with a ThumbDV.

This is the Ukrainian Transverter kits. Good YouTube on one

 https://www.youtube.com/watch?v=w8JQ0SIUlI8&t=132s

Photo of Greg AB4GO

Greg AB4GO

  • 3 Posts
  • 0 Reply Likes

I want to operate my transverters this coming Easter weekend.  On my Flex 6500, my intention will be to open two slices; one for 2 m transmit using ant 1 port, one for 70 cm receive using ant 2 port, or vice versa.  The Flex 6500 slices will be tuned for 10 meters.  Separate Quadrifilar Helical Antennas will be used for 2 m and 70 cm.  I will try for FO-29 and SO-50.  I will use HRD to correct for Doppler frequency shift. Greg, AB4GO


Photo of David Warnberg

David Warnberg

  • 538 Posts
  • 56 Reply Likes
Take a look at the XW-2(A,B,C,D,F) SATS they are very easy to work as well
Good luck

David
KK4QOE
Photo of Jd Dupuy

Jd Dupuy

  • 155 Posts
  • 60 Reply Likes
FYI, you might want to check your prices for Kuhne Transverters. They run well over $1,000.00. I own 6 and they are the Top Class in transverters. I will email you some information later today.
Photo of Chris DL5NAM

Chris DL5NAM

  • 589 Posts
  • 128 Reply Likes
Dave, have also look to one of best still on market: http://www.ha1ya.hu/transverters.htm

I am not a 2m operator but a good friend of mine is over 40 years a "2m operator only" , running one of the best 2m station ( 8x 15 ele, 150 feet tower, top of a hill) in Germany (maybe in EU)

He using http://www.ha1ya.hu/htmkepek/me2t_protransverterspec.htm and use 14 MhZ 
Maybe it help

73 Chris
Photo of Rev. David E. Hamm, K4EET

Rev. David E. Hamm, K4EET

  • 83 Posts
  • 13 Reply Likes
To everyone, I truly appreciate all of the comments and equipment information. I have a lot to digest now which will take me some time. My intentions of this thread have been met. Provide a one-stop shop for everything that I was asking about. And all of you have met that need with flying colors. Thanks again. Now I am off to start digesting the presented information. If I have any further questions, I'll post them in this thread. And if anybody else has something to share in this thread, by all means please do. 73, Dave