Re: External PTT connection

Bob Hoffmann, K4CQO

Finally got it to work!

I saw in the manual that there was a 16 pin connector that was provided with the ic-7000 and wanted to look to see if I could use it to replace the one that I had in case the wrong pin was found to be used.

Well, the connector had a cable and an RCA plug on the end. So, I decided to try it. Plugged it into the ic-7000 and the RCA plug into the QRM-180 noise canceler. When I turned the units on, I could switch the band and the relay did not change – still in the receive mode. Then I keyed the transmit, and the QRM-180 switched to transmit mode and then back again to receive mode when the ic-7000 was back to receive mode. Exactly like it should work.

I noticed when looking at the manual that there was a user change to power pin 5 of the connector. I think that what was done and the cable (the one that I purchased from eBay that even has “7k” written on the connector) looks at pin 5 instead of pin 3. So the cable I got was an incorrect cable.

All is good and it is working to switch the QRM-180 to a bypass mode when the ic-7000 is transmitting. Now I just need to get the receive antenna connected and I can see how it works.

Thanks everybody for responding.




73 – K4CQO

Bob Hoffmann



From: <> On Behalf Of Rich Seifert
Sent: Thursday, September 26, 2019 3:45 PM
Subject: Re: [ic7000] External PTT connection



On Sep 26, 2019, at 11:47 AM, Bob Hoffmann, K4CQO <rjhoffmann@...> wrote:


Thanks for responding Rich.

However, what I am seeing is -- if on 2m & 70cm receive, the relay -- presumable from having voltage applied -- shows not connected. This is whether I am transmitting or not.

For any HF setting (including 6m), it shows that the relay is connected -- presumable by the voltage disconnected from the relay. Again this is whether I am transmitting or not. So the relay is on / off depending on what band the ic-7000 is set to.

Assuming that the hsend is connected to the relay -- that would mean that hsend is grounded whenever an HF band is selected, and not grounded when 2m or 70cm are selected. I was wandering if that is an operation on a different pin than 3 -- meaning that i have the wrong cable, or if there is something that is set in the ic-7000 that does that. 

It looks like there is no such setting -- only the scope of the vsend / hsend. So, can it be that I have the wrong wired cable -- is there a different pin that does that?

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