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Author Topic: Icom r75 - ic-718 Transceive  (Read 324 times)

K0XY

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Icom r75 - ic-718 Transceive
« on: July 29, 2022, 01:27:27 PM »

my r75 and ic718 are capable of tranceive, as a pair, through an RCA connected cable to their respective CIV connectors (#4)...both units have the baud rates set to 9600 and the TRN menu set to ON...they will not allow tracked freq control by the main tuning knobs of either radio ...so I tried my ic7300 in this mix and neither of the radios would perform the tranceive function in any combination of the 3 radios set at 9600 and TRN ON... I do not believe all three of these radios are defective...It must be me or my configuration...ANY THOUGHTS on this problem....thank you Ron K0XY
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N8YX

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Re: Icom r75 - ic-718 Transceive
« Reply #1 on: July 31, 2022, 04:53:11 PM »

Try setting one to "Transceive" and the other to "non". The Transceive-enabled unit should control the other.

How about CI-V ID - what does the manual say in regards to that? If they're all set the same, they probably won't recognize one another.
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K0XY

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Re: Icom r75 - ic-718 Transceive
« Reply #2 on: July 31, 2022, 07:18:15 PM »

...let me try that and thank you...the units are all named differently from the factory...but the TRN on and off could be...I'll be back in a bit...
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K0XY

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Re: Icom r75 - ic-718 Transceive
« Reply #3 on: July 31, 2022, 07:27:01 PM »

...well I did switch one to ON and the other to OFF, and vice versa but neither worked...but I thought it was a great idea...and thank you !
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N8YX

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Re: Icom r75 - ic-718 Transceive
« Reply #4 on: August 01, 2022, 07:05:59 AM »

...well I did switch one to ON and the other to OFF, and vice versa but neither worked...but I thought it was a great idea...and thank you !
Baud rates the same?

I did a quick search of "CI-V Transceive" and ran into a few mailing list discussions regarding various scenarios and problems. Also have an IC-751A/R-71A pair here that I can run a few tests with.

You are using a "mono" cable to connect the CI-V ports, correct?

ETA:

I also found this:

https://www.universal-radio.com/catalog/commrxvr/0175rear.html

https://www.universal-radio.com/catalog/hamhf/0718rear.html

Note the rear-panel connector descriptions. You'll need the Mute connection (Connector 9 on the 718 to Connector 6 on the R-75), a way to feed the transceiver's Antenna connection to the receiver if not running a separate receive antenna (I use a Mini Circuits 50-ohm splitter) AND the CI-V connection (1/8 mono plugs) if you want true "transceive".

The IC-720(A) 745, 751(A) and other have Ant In/Out jacks on the rear panel to facilitate feeding both the transceiver's receive section and a separate receiver from the main antenna. It looks like the 718 lacks this, unless the connections are available via the Accessory socket.
« Last Edit: August 01, 2022, 07:15:36 AM by N8YX »
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K0XY

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Re: Icom r75 - ic-718 Transceive
« Reply #5 on: August 01, 2022, 10:09:14 AM »

...tnx for the response...yes, I have all baud rates set to 9600...and the transceive connecting cable from rear connector #4 to rear connector #4 is an rca type audio mono cable (civ to civ)...I have the mfj1408 antenna switch for ant switching and mute control and that part works fine...I have both units with TRN ON and then with one unit OFF even though the manual says ON... and the crazy part is I had this setup operational a few years ago with a different set of 718/r75 and they worked like a charm...of course I sold them both...duh...and even at Icoms suggestion I set up the TRN scenario with a 7300 and the 718 then the 7300 with the r75 and ...nothing...crazy...thank you and any other thoughts are appreciated...Ronnie K0XY
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N8YX

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Re: Icom r75 - ic-718 Transceive
« Reply #6 on: August 01, 2022, 10:16:00 AM »

Have a PC that you can test the CI-V comms with each individual unit? I'd start there, and if possible try to use the CT-17 interface with the mono cable you're using to connect them. That way you can rule out the interfaces and the cable itself.
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K0XY

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Re: Icom r75 - ic-718 Transceive
« Reply #7 on: August 01, 2022, 01:04:51 PM »

...thank you for your responses, I appreciate your effort...I believe your last response will sort out which item might be the culprit...but I do not have a ct-17 nor have I ever tried to connect any of my radios to a pc...the hookup may be beyond my 'pay grade'...so, I have a repair service I have used (not local) that I will have to contact and work with them on a setup or repair as necessary scenario...again, thank you...
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N8YX

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Re: Icom r75 - ic-718 Transceive
« Reply #8 on: August 01, 2022, 03:29:29 PM »

I don't think they're broken unless the CI-V port(s) took a voltage spike. The CT-17 will help rule this out. As an alternative, you can get the USB-to-CI-V cable that's used for radios like the IC-703, 705, etc. and test with it. I'd look on Icom's site for S/W to control your rig - they still support my PCR-1000.
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K0XY

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Re: Icom r75 - ic-718 Transceive
« Reply #9 on: August 03, 2022, 11:07:58 AM »

...I just noticed your YX and I am XY...what are the odds ? ...you have been a great help... for the current time I'm going to move ahead with Plan B...I,m making this up as I go, but I am 99% CW so this may make it easier...so one of the drawbacks of the r75 transceive  mode is that the freq's are locked together, so if the dx station is calling , 'up 1' then I have a problem...but as separate radios I can move in any direction any time...and with both radios having stable digital readouts I can get really close very quickly and if I have tested the freq readout differential I should be very close...so that is Plan B for the current time...I have not tried this yet...and if this does not work,  go to plan C ...which is turn on the ic7300 or ftdx10 andwork 'em that way and quit driving myself crazy ! ...thank you for your patience...
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N8YX

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Re: Icom r75 - ic-718 Transceive
« Reply #10 on: August 03, 2022, 11:38:49 AM »

If you really want to get convoluted:

I'm working here and there on a PIC/Arduino/Stamp solution which will sit between 1 or 2 transceivers and 2 through nth receivers. It will allow for split or transceive (synced) operation and let any number of the attached receivers play "follow the leader". When I get my new shack and lab up and running, I'll resume work on the project.
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K0XY

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Re: Icom r75 - ic-718 Transceive
« Reply #11 on: August 03, 2022, 04:09:27 PM »

...yes, that is a handful but you certainly have the expertise... and thank you for sharing some of that with me !!!
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K0XY

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Re: Icom r75 - ic-718 Transceive
« Reply #12 on: August 04, 2022, 07:42:45 AM »

....happy trails...I did set up both radios and tuned the same cw signals in an A-B freq check, and much to my shock they were spot on the same freq readout...so wired in the mfj  1708 for switching and muting and all went well...I;ll have to see if this is a tenable situation over time...or if I am in lalah land,,,carch you later...
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N8YX

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Re: Icom r75 - ic-718 Transceive
« Reply #13 on: August 04, 2022, 08:02:35 AM »

When you tune the 718, does the receiver track it?
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K0XY

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Re: Icom r75 - ic-718 Transceive
« Reply #14 on: August 05, 2022, 12:08:10 AM »

...no, they are independent on receive...so if you tune a signal on the r75 you must set the freq on the 718 manually..its a lot like using the spot feature on the fl101 and fr101 of yesteryear...
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