[amsat-bb] Icom IC-9700 and Kantronics TNC

Sun Sep 6 18:28:24 UTC 2020

Tim,

It seems a modulation issue of some type.

I don't have a 9700 but I do have a 7600 and had a modulation distortion problem. When using the accessory port insure that "DATA OFF MOD" is set only to "ACC", not "MIC+ACC". All the others should be set to "USB".

___
Sent from my two way wrist watch
73 de W3AB/GEOOn Sep 5, 2020, at 22:00, Tim N8DEU <n8deu at outlook.com> wrote:

I made several measurements with the deviation starting at 0.75 kHz up to 4.00 kHz in 0.25 kHz steps. At each step 10 packets were transmitted and multiple receivers were used for decoding. At no point did the success rate go above 50% decoding. At 3.25 kHz and 3.50 kHz the transmit decode rate was 50%. All other settings were less.

The Kantronics 9616 cannot drive the IC-9700 any higher than 4.07 kHz deviation and that level is achieved at XMITLVL = 114. Increasing the XMITLVL does not produce any additional increase in FM deviation using the square wave tone from the CALIBRATE mode.

I have worked with 1200 baud packet for 33 years and set up quite a number of systems and this one will require some more observation. The same Kantronics 9612 connected to a Yaesu FT-736 or and an FT-847 show a 100% packet decode rate at 1200 baud. Both of these radio’s work fine at 9600 baud which is something not mentioned anywhere for the IC-9700.

I was checking to see if others are having issues with the IC-9700. This started with a friend asking questions for the past 2 months about having trouble with the IC-9700 connected to a KAM XL and I walked him through all the logical steps. Finally, I decided I better try hooking my 9612 up to the Accessory Port to see how it works. This should not be too complicated. My results were exactly the same poor results he encountered on transmitting 1200 baud packets.

Increasing TX Delay does nothing to help as that does not seem to be the issue. 

1200 baud packets are decoded through the receiver perfectly fine.

The problem is transmitting 1200 baud packets for a successful decode rate on the IC-9700 through the Accessory Port.

Best Regards,

Tim Cunningham – N8DEU

From: GEO Badger
 Sent: Saturday, September 5, 2020 3:00 PM
 To: Tim N8DEU
 Cc: amsat-bb at amsat.org
 Subject: Re: Icom IC-9700 and Kantronics TNC

Can you look at the deviation? 

---  
 Ciao baby, catch you on the flip side 

 73 de W3AB/GEO     

 http://www.w3ab.org 

You can say "over", you can say "out", you just can't say "over and out". 

On Friday, September 4, 2020, 08:59:04 PM PDT, Tim N8DEU <n8deu at outlook.com> wrote: 

Simplex is the only method I tried at this point to keep it simple. 

Two different IC-9700 Radio radios, one with a Kantronics 9612 and one with a Kantronics KAM XL. Both using simplex and both exhibiting the same results. 

- Tim 

From: AMSAT-BB <amsat-bb-bounces at amsat.org> on behalf of W3AB/GEO via AMSAT-BB <amsat-bb at amsat.org>
 Sent: Friday, September 4, 2020 6:52:05 PM
 Cc: amsat-bb at amsat.org <amsat-bb at amsat.org>
 Subject: Re: [amsat-bb] Icom IC-9700 and Kantronics TNC 

Tim,

 Have you tried simplex contacts?

 ⁣___
 Sent from my two way wrist watch
 73 de W3AB/GEO

 On Sep 4, 2020, 14:53, at 14:53, Tim N8DEU via AMSAT-BB <amsat-bb at amsat.org> wrote:
 >Has anybody interfaced a Kantronics 9612 or the KM XL TNC to the
 >accessory port of the Icom IC-9700?
 >
 >The reason I am asking is there are two IC-9700 users using the same
 >firmware who are experiencing the same issue with both of these TNC’s.
 >Packets are decoded with little to no issue on the receive side, but
 >the transmit side is a different story.
 >
 >It seems only about 30% of the transmitted packets are decoded by other
 >stations using 1200 baud. The deviation of the transmit signal and the
 >TX delay are not the issue. The same TNC works with no issue on a Yaesu
 >FT-736 and the FT-847.
 >
 >
 >Thank You,
 >Tim Cunningham - N8DEU
 >
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 _______________________________________________
 Sent via AMSAT-BB at amsat.org. AMSAT-NA makes this open forum available
 to all interested persons worldwide without requiring membership. Opinions expressed
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 Not an AMSAT-NA member? Join now to support the amateur satellite program!
 Subscription settings:  https://www.amsat.org/mailman/listinfo/amsat-bb 