ISS on Kenwood D710 - Help!

Well, having now driven myself officially insane, I have a giant favor to ask...My grandson and I have been trying to set up the 710 to APRS the Space Station...I have followed several YouTube videos to the letter...I have a been using a good tracking program...In three nights of listening on 145.825 we have not heard a single packet, had a single "hit" on APRS...I know now that the VHF is down and the ISS is using 437.55...So do I simply change the Beacon Freq to that and transmit the Beacons as usual? These were pretty good passes, too...(EL 39*)...Could anyone out there give me a listing of exactly how to set up the 710 for ISS/APRS? I know this is a huge favor, but our frustration level is rising...There is a good pass tonight (EL 77*) so I am hoping we might have some luck...I do not have a directional antenna, but I do have a good outside vertical on the roof...Any advice is much appreciated!

Steve KA1OWC
Kevin KE0MBK

LTCSZ – Sun, 2017 – 03 – 26 13:08

Your D710 was working tonight


I saw KA1OWC on the ISS pass around 0245 UTC this evening (Monday 27 March, on the UTC clock). You figured out the path needed for the ISS digipeater to retransmit your packets, and I saw your position packets on my TH-D74A HT here in Arizona. You can see a picture of my HT's screen with your call sign and location at:

Were you only operating on 437.550 MHz, or did you have a group of memory channels programmed as listed in this AMSAT document:

I was using H0UND (H-zero-UND) as my "call sign" on that pass, with my WD9EWK call in the comment sent with my position packets. My greyhound was out in the yard during that pass, so I use that "call" when she is around. Did you copy those packets, or see anything else coming back from the ISS on that pass?

Until the ISS crew puts a VHF radio in place and turns it on, we'll have ISS packet on UHF for a while longer. How long - nobody knows, or nobody is saying when the change will be made.


Twitter: @WD9EWK

Submitted by WD9EWK on Sun, 2017-03-26 23:41.

ISS VHF radio should get swapped middle of April

ISS Packet Radio currently UHF 437.550 Mhz

ISS radio to be swapped out and returned to VHF 145.825 Mhz tweeted from RF2Space

It takes 30 minutes of scheduled time for the swap vs. 5 min. for the power on. Should get swapped by middle of April.

Submitted by G7HCE on Fri, 2017-03-31 16:00.

ISS radios likely to be swapped out to VHF next 24hrs

#ARISS radio likely to change from UHF (437.550 MHz) to VHF (145.825 MHz) packet in the next 24 hours. #hamradio #iss #AMSAT #ARRL as tweeted by RF2Space

Submitted by G7HCE on Thu, 2017-04-13 13:41.

ISS Digipeater is back on VHF 145.825Mhz 13:58 UTC

The ISS APRS packet digipeater is back on 145.825Mhz heard over Exeter at 13:48 UTC and heard IR0UGN-1

Submitted by G7HCE on Fri, 2017-04-14 11:00.


I guess I got it figured out! I was using 437.550 without the Doppler correction that I am now aware of...I have a lot to learn about APRS! Thanks for the report and the encouragement!

Steve KA1OWC

Submitted by LTCSZ on Fri, 2017-03-31 12:58.

Doppler correction

Hello, I have had the same problem to detect the ISS. I programmed for each PM, the frequency of Rx in A and Tx in B, as explained in

I also defined the DATABAND as A: Rx B: Tx, in menu 601 for each PM.
But I still can not hear the ISS !!

I'm using a 5.5dB omnidirectional antenna and the TM-D710. I would like to know how was the APRS configuration with which you detected the ISS.

Thank you so much

Submitted by EstebanCR on Fri, 2017-04-07 16:35.

Re: Doppler correction D710


There is now no need to program memory channels for split frequency on your D710 as the ISS radio packet digipeater is now back on VHF 145.825 Mhz FM and doesn't require the doppler correction.
Use Data Band A (default) Menu 601. Set DCD SENSE to IGNORE DCD you can either close squelch or open the squelch fully to hear weak signals. Packet Path set to Others and Path: ARISS.
If your radio has GPS Enable GPS so it's blinking. Set Beacon to Manual and press beacon button to transmit your GPS beacon.

It's best to use Kenwoods free programing software (requires PG-5G cable) to easily program memory channels and APRS User Phrases etc. The software download can be found here:

Submitted by G7HCE on Fri, 2017-04-14 16:22.

Re: Doppler correction


You need to use free Kenwood MCP-6A programming software for editing memory channels and make sure the box is ticked to use the Split Channel function when editing the memory channel for Receive and Transmit frequencies. Set each memory channel as per Patrick WD9EWK/VA7EWK shown in previous post.

Use Data Band A (default) Menu 601. Set DCD SENSE to IGNORE DCD and open the squelch fully to hear weak signals. Packet Path set to Others and Path: ARISS
Enable GPS so it's blinking. Set Beacon to Manual and press beacon button to transmit your GPS beacon.

Omnidirectional antenna is poor on UHF and is best when passes are below 30-deg and unusable for overhead passes.

Submitted by G7HCE on Fri, 2017-04-07 18:28.

programming for 70cm ISS packet


G7HCE's post beat mine by a few seconds. I wrote that document on the AMSAT web site, and it does not mention using two VFOs in any radio, but to program a group of memory channels. G7HCE also added some information specific for your radio, so you can get it working with the ISS packet on 437.550 MHz until things change back to 145.825 MHz.

Have you tried just listening to the ISS packet as the station passes over you? Start at 437.560 MHz early in the pass, then tune down and end up on 437.540 MHz near LOS. How well do you copy the packets? Make sure you use the VFO that is the data band in your TM-D710.


Twitter: @WD9EWK

Submitted by WD9EWK on Fri, 2017-04-07 18:30.

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