Internal Packet Modem Help

RadioMail
1

Hello,

I am having some trouble getting Radiomail to work with the internal packet modem. I think I have the levels set correctly using the built in tools. I am using the Digirig cables with a Yaesu FT-60.

I can get it to transmit but it never connects. I recorded the signal from Radiomail and from my home Winlink station. There is a distinct difference in the sound. I have attached the recordings here. The Radiomail transmissions just don't sound right.

Thoughts?

Thanks

(attachments)


2

Which DigiRig model are you using?

How did you make the recording?

3

Wow - fast response!

I am using the 2 cables below in series (Phone - VOX PTT cable - Yaesu cable - HT):

VOX PTT Cable for Smartphones - https://digirig.net/product/vox-ptt-cable-for-smartphones/

Yaesu HT Audio/PTT Cable - https://digirig.net/product/yaesu-ht-cable-for-digirig-mobile/

I made the recording with an iPad held in front of a 3rd radio tuned to the frequency I am using.

Mike

4

Something does not sound right. What device are your using? Are you connecting the DigiRig VOX PTT via a lightning to audio adapter?

When you use the audio output diagnostic in RadioMail, you should hear a clear sine 2200 Hz tone and nothing else. Make sure the volume on the phone is high enough.

5

I'm using an iPhone 13. Yes, I am using an lightning to audio adapter (OEM Apple).

I just did the "Audio Output Diagnostic" again while listening to the TX signal on another radio. I set the phone output volume so that the tone sounded the cleanest.

That did not rectify the issue. Listening again carefully, it sounds to me like the packet "sounds" are there in the background when it tries to transmit. But, there is a tone being transmitted on top of it. It sounds very much like the 2200 Hz tone I hear in the "Audio Output Diagnostic".

I just tried with another device (iPad) using a different audio adapter (this one is a USBc-to-audio instead of lightning-to-audio and also Apple OEM). I got the same results. When it should be transmitting AX.25, it is transmitting a tone. Or, it may be transmitting a tone over the packet audio, but the tone is covering it up.

Since it has the same behavior on 2 iOS devices using 2 different audio adapters, I wonder if it is a defective Digirig VOX audio cable?

6

Yes it seems to me that the right channel audio tone that's controlling the PTT is bleeding into the left channel that contains the signal. To rule out the device and software entirely, you can try to put a headphone in the audio jack directly and run the Audio Output Diagnostic. You should clearly hear the 2.2KHz sine tone on the left and a 1KHz square wave signal on the right. DO NO PUT THE HEADPHONE ON as it can be quite loud.

If the two tones are clearly distinct from each other, it might be a defective VOX cable.

7

Thanks for walking through this with me Georges.

Yes, I can confirm the AX.25 audio comes through the left channel and the tone comes through the right channel when using headphones.

Once we get past Christmas I’ll reach out to Digirig.

73
Mike

8

Hi Georges,

I'm not sure if you saw the emails from Denis at Digirig, but he suggests changing the PTT tone to something like 10kHz (or making an option to change it in the app).

Thoughts?

Mike