Icom718 Cannot Transmit

I am using the digirig to connect my Icom 718 to my laptop.

I am using the usb cable and cat cable from digirig. I can receive signals no problem and decode them, however currently I am unable to transmit through the computer/digirig.

I have tested and I can transmit SSB and CW through the radio without the digirig. I have tested transmitting the digital modes, PSK, FT8 and RTTY using digirig with N1MM using the Fldigi and WSJT-X addons and in all cases the waterfall shows my transmission as if it is being transmitted but no one can hear me, I have checked with people who I know who are monitoring and they have confirmed i am not sending anything.

I have tried plugging my headphones into the audio out in the digirig and can confirm I can hear the signal from the laptop so that is not the problem.

I have been through the troubleshooting and the only bit I wasn’t sure about was switching from Mic to line out, I can’t specifically find anything that says this is required for 718 or how to do it, I have switched to Vox mode however on the radio (and using for WSJTX as well).

I have looked through some other posts on the board regarding Icom718 but couldn’t find anything directly comparable.
Any ideas greatly appreciated.

the 718 is pretty straight forward.
i’m pretty sure it is similar to my ic-736 ‘generation’ rigs.
using the rear acc jack will trigger ptt and pass audio without additional menu settings on the radio itself.

since you verified audio out from the digirig, i’ll move onto PTT

does the TX LED ‘light up’ when when software is asserting PTT?
can you test PTT by unplugging the audio/ptt cable from the digirig and shorting the ptt ‘ring’ to ground and see if the radio goes into tx?

are/were you using RTS for ptt in software?
was the correct comport identified and used by only 1 software application at a time?

i’m not well versed with the n1mm software so i’m not much help there.
wsjt-x by itself should work just fine when defining the radio, comport for ci-v, and comport for RTS though.

good luck

kb0wlf

Thanks for clarifying regarding the need to set the line out although I have had a look and there is an option for CI-V transmit which was turned off and I have now turned to on, still does not solve the issue though.

The TX Led does not light up on the radio when I press transmit in the software, I have tried ‘shorting to ground’ i.e. unplugging the audio cable of the digirig and holding it to the metal chassis of the radio and my shelving unit and it does not enter transmit.

Also, and I think this is probably key, I have noticed that when I make a loud noise the radio goes into transmit mode, this implies that it is transmitting using the microphone array in my computer to transmit instead of the digirig, when I check the settings in WSJT-X within N1MM it shows that both the input and output devices are set to digirig, therefore I am unsure where this is being picked up from unless the transmit side of the digirig is configured incorrectly, this is what I am looking into now.

No I am not currently using RTS, I am using VOX mode with no rig selected as every other option gives a hamlib connection error, although I can see the Serial port showing clearly in Device manager, confirmed only being used by 1 program at a time, I have also tried simply opening WSJTX separately and have the same issue.

Thanks very much for your help!

ok, i’m almost positive there is NO vox available on the rear acc jack.
so that would account for no ‘tx led lighting’ when using software to tx without using RTS or CI-V for PTT option.
my 736 era radios absolutely do not have vox ptt capability when using the rear acc jack.

so do you have the radio microphone plugged in the front?

if so, that may be why the radio is keying upon a loud noise.

you can choose ‘none’ for radio, in wsjt-x and still use RTS for keying the radio.
you’d have to disable vox on the radio ‘i think’.
(sorry, my 736 era radios have a pushbutton for vox rather than a menu option so i’m not 100% on this)

kb0wlf

I’ve checked the manual and it’s called the CI-V REMOTE CONTROL JACK [REMOTE] see below screenshot from the manual - the two circled are the ones I have plugged into the Digirig with 4 going into the ‘Serial’ port on the digirig with the green end and 6 (the CI-V) port connected to the audio port in the digirig with the black cable, let me know if this incorrect but I understood this was right.

I think the issue with the detection may be due to the digirig settings on the PC, when I go to the digirig recording device in the computer sound settings and listen to the device I can hear the input from the radio, is this correct or should I not only be hearing my transmissions on this?

6 is audio + ptt
4 is serial (remote control/ci-v)

you might have misstyped the ci-v but sounds like you have it plugged in correctly.

so in windows the ‘listen’ function is kinda like a switchboard where you can use the speakers of one audio device to ‘listen’ to the microphone of another audio device.

in normal operation, this is not checked but shouldn’t make a difference in operation.
just whether you like hearing tones outputted or not.

the part of your troubleshooting where shorting the audio cable doesn’t PTT the radio is where i would look first.

gotta get a ptt source. shorting ring 2 to sleeve should put the radio into TX.
:slight_smile:
kb0wlf

So I tried unplugging the rig cable and the good news is I was able to transmit testing on FT8! Bad news is I turned off N1MM for a bit went back on it and no longer seem to be able to get it to work again lol but it seems that if I just have the CAT-V connection without the other one it does work, strange it has stopped again though as I didn’t change settings that I know of, ah well I’ll keep playing. Been playing with it a while now and can’t get working again frustratingly, but I know it is possible now.

Right, so I have now confirmed all working pretty much perfectly using RTS in WSJT-X, however when I try to do the same in N1MM using WSJT-X I just can’t get it to transmit, it seems like it is an issue with the N1MM settings though, when I have RTS as always on it just stays on Transmit, however when I have it on PTT or always off I can’t get to connect at all, I’ll keep working on this but I’ll probably head over to the n1mm support as it seems that is the issue now, thanks very much all for your help.

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Same here. I got it to work, transmit, once using RTS but it never unkeyed, just continuted transmitting till I powered the radio off. Something clearly not yet right.
I have not had time this week to work in it but will this weekend, maybe something will work.

Sticky PTT is typically an RFI situation.
Please check out the corresponding section of the troubleshooting guide at:

I had read that somewhere else in the group.

At the time I got it that far I was out of time for a bit. I have a digirig891 and know there is some small fiddling around needed.

Thanks for the reminder.