Regarding a low cost radio around $100 I'm testing a prototype of a SDR/DSP receiver based on our Sentinel 2 SDR receiver ($242) at the moment. It's running at the workshop as a receive igate, G4HYG-3

I would say that the unique feature would be the simplicity of use. As it's a DSP based receiver you don't need to run a SDR program for it to work. For monitoring the 30m HF APRS frequency all you wo

Just a receiver at the moment based on our SDR-4/ Sentinel 2 SDR receivers. A transceiver may be a future option but would need a lot more work. Regards, Chris

It's possible to go too low in price by picking inferior components. Unfortunately the QCX set is let down by the choice of a Si5351A as the synthesiser. It does generate a lot of phase noise compared

The minimum PC requirement is anything that can run APRS Messenger and the UZ7HO soundmodem programs together to allow it to igate FSK300 bd signals as well. An old laptop could be used or if you were

The point of a receive only HF igate is that we are no longer at the peak of the sunspot cycle and in many urban and suburban locations RF noise is killing HF listening. A few HF APRS receiver igates

Yes it certainly radiates! Regards, Chris

I've just uploaded v3.52 of APRS Messenger to the web page. This version has many updates and new features: MFSK-4 and MFSK-16 modes have been optimised for weak signal use. MFSK-4 is similar in perfo

Replies to a few points raised so far: The increase in audio level comes as a result of adding the PTT function for UZ7HO. It keys the PTT without any modulation from APRS Messenger for a short period

Interesting comment as v3.34 ran heavy squelch settings on all modes and if the signal faded out the text for the decode was lost. The received text was parsed for ".~" and "~ " to find the start and

Whatever it is it's top ff the list for fixing in the next version. The PTT keys and it sends a short transmission but at zero audio level so nothing gets radiated. Ghosts in the machine... There are

Hi Scott, Good to hear that you are enjoying using APRS Messenger. One of the features in the program is that there is a time delay of around 4 seconds between the end of the transmission and sending

The Internet to HF option allows an igating station to relay messages from the APRS-IS to HF. When enabled it only relays messages to stations in the "HF stations heard" list using GMSK-250. Although

On the first page that opens the callsign entry boxes are at the bottom of the window. Click the "Stop the clock..." click box to give you time to study the options. When you have entered the callsign

OK, I'll keep the Internet to HF option in the program. One point I forgot to mention is that for internet to HF to work the station's callsign must be included in the Group callsign box on the set-up

In previous versions of APRS Messenger the com port list covered the full 255 possible com ports. To increase program start-up speed in version 3.52 I reduced this to 64 com ports. This probably expla

The original idea behind the Group call was for use in emergency communications where one station was the control station. If all the stations in the group put the control stations callsign in the Gro

The only thing you would need to do would be to contact the station doing the Internet to HF transmitting and ask him to put your call in his Group call box. It would then work exactly as you describe

I decided to spend most of Easter Monday working through the list of bugs in v3.52 reported by users. I also took the opportunity to remove some obsolete feature like the Raynet spreadsheet, remote ig

I've just downloaded and tried Franson GPSGate on my Windows 10 PC. From what I can see it only works with very old programs and doesn't show up on other modern programs. I tried it with APRS Messenge