Help with APRS to ISS

Greetings all..

I am new to working APRS. I am seeing conflicting info about uplink and downlink freqs for ISS digipeater. Is it 145.825 up/down? I am seeing some things list 145.99 uplink. I hear the ISS and decode it fine on 145.825.

Second question- I am running UISS pro with the path set:
to: APEG02
via: RS0ISS-4

Is this correct? I am also running a satgate connected to the net. Can I still run the satgate while trying to digi through the ISS at the same time?

Thanks so much for the help!


WU2V – Thu, 2012 – 05 – 31 20:02

The ISS does not do APRS

APRS stands for Automatic Packet Reporting System, which is a system developed by Bob Bruninga, WB4APR wherein location, information, and other data is shared on a network (usually on 144.39) using packet radio.

Packet radio uses (A)X.25 tone to pass data at 1200 and/or 9600 baud, usually though a terminal node controller (TNC).

The radio on the ISS is a packet station, and has nothing to do with APRS.

73, de N8WCT

Submitted by N8WCT on Tue, 2012-10-09 08:52.

Kenwood D700 on ISS

The ISS has a Kenwood D700 which is a APRS capable device. You are correct that the ISS does not utilize this capability and mainly acts as a digipeater. I think the hardware type contributes to a lot of the confusion between packet and the subset operations of APRS.

Kenneth - N5VHO

Submitted by N5VHO on Tue, 2012-10-09 11:55.


So on a D710 would you set the TNC to APRS or Packet to contact ISS?

Submitted by KJ0NAS on Fri, 2012-11-16 14:32.


Either. They are both using AX.25 protocols but you will likely find it easier to use the APRS settings instead of hooking up a computer to the radio to take full advantage of the PKT settings.

Submitted by N5VHO on Sun, 2012-11-18 20:29.

Re: Help with APRS to ISS

Hello Matt,

ISS aprs/packet system works on 145.825Mhz (FM/N) simplex.
The old uplink 145.990Mhz not used for a long time
anymore (sadly people leave that freq. on their website).

If you install UISS for the first time you will see the path:
To: CQ

People should not chance that settings.

73's Cor PD0RKC

Submitted by pd0rkc on Fri, 2012-06-01 07:07.

Question about how to prepare an APRS contact via ISS

Hello !

I just started working in APRS and there are a lot of things that I try to understand when it comes to make a contact via ISS. I have a MAAS AHT-2UV transceiver connected with a pair of audio cables to a Android phone, which runs APRSdroid application. For "terrestrial" APRS, all it is perfect, I can receive and transmit APRS packets without any packets, using normal DIGI PATH WIDEn-N.

Now, my question is: for ISS operation, the DIGI PATH field im my application sould be set with the following string: UNPROTO CQ VIA ARISS ?

Thank you !

Best 73 !
Catalin, YO3FVR

Submitted by yo3fvr on Thu, 2012-09-13 10:38.


If you replace WIDEn-N with ARISS then you should be ready to go.

Submitted by N5VHO on Thu, 2012-09-13 14:34.

It works !

Thank you Ken for the hint ! It works perfect !

Submitted by yo3fvr on Fri, 2012-09-21 06:59.


I have question about APRSdroid is possible this apps can make contact with ISS? and how to setup with my smartphone.

Thank you


Submitted by 9W2DYA on Sun, 2012-10-21 10:59.


Hi !

Today was the 3rd time when I succeed to sent packets via ISS, using APRSdroid 1.2 and portable whip antenna in 5w transceiver. Now, I'm a beginner in this area and I'm not sure if that means to make a contact with ISS. But, I think that the packets were received via ISS because YU7RD and YO8BMF confirmed me this:

2012-10-29 06:48:05Z

2012-10-29 06:46:49Z

Anyway, the main settings for APRSdroid ar in the APRS Connection section:
a) Connection Protocol must be set with: AFSK via Speaker/Mic
b) Connection Preferences / APRS digi path: ARISS

I used a HTC Gratia Smartphone, connected directly with the VHF transceiver, using a dual audio cable. On the transceiver side, the VOX is enabled, in order to activate the PTT function.

Unfortunately, not every smartphone can be used with a direct connection via audio cable ! In this case, the speaker's phone must be placed near the transceiver's MIC (also with VOX function enable) and the transceiver's speaker output level must be set at a proper value in order to be "heard" by the APRSdroid.

The APRSdroid provides a Bluetooth TNC function but I don't tested !

73 & GL !

Submitted by yo3fvr on Mon, 2012-10-29 09:23.

Good Info

hi, Catalin
Thank you for information i am very appriciated that give more knowledge about APRSdroid. I will tried this soon.

73, Jojet

Submitted by 9W2DYA on Wed, 2012-10-31 13:43.

Date UTC Az El Lat Lon Orbit Vis

Select your Location


Live APRS Tracking