[Elecraft] Controlling KAT500/KPA500 with Icom 7610

[Buck]

Auto-sense works.  I just don't understand why Icom/Elecraft would even 
suggest hooking up the molex connector to the KAT500 if it doesn't do 
anything.  It is a waste of time.

I got the W2GNY plug to fool the 7610 into transmitting as 10 signal and 
it works.  I guess I will stick with that.

Buck, k4ia
Honor Roll
8BDXCC
EasyWayHamBooks.com

On 4/19/2021 2:31 PM, Ken Winterling wrote:
> Buck,
> 
> I have had the IC-7610 and KAT500/KPA500 for almost three years and they 
> are a very nice pair (or trio..). The IC-7610 doesn't "control" the 
> KAT500 per se. Changing bands/frequencies on the IC-7610 doesn't cause 
> any response from the KAT500. Only when the IC-7610 transmits does the 
> tuner detect (sense) the RF and then adjust the capacitors and inductors 
> to match to the current antenna. An Elecraft transceiver, OTOH, does 
> communicate with the KAT500 (and KPA500) and changes 
> bands/frequencies/antenna ports as the bands and frequencies are changed.
> 
> The KPA500 responds the same way and changes bands by sensing transmit 
> RF. You can build a "band data" cable to interface the IC-7620 to the 
> KP500 and it will, with restrictions, follow the band selected by the 
> IC-7610. The restriction is that Icom's band data voltages do not 
> support the WARC bands. As a result, both 24 mHz and 28 mHz select 
> 28mHz; both 18 mHz and 21 mHz select 21mHz. So, for all bands except 
> WARC, the KPA500 will follow band selections made on the IC-7610 (or 
> almost any other Icom such as the IC-7300, etc.).
> 
> I can send you a diagram of the band data cable if you would like. It is 
> only marginally useful and most ops of non Elecraft gear seem to just 
> let the KPA500 (and KAT500) RF sense the transmitted RF to make 
> necessary selections. Be sure to read the KAT500 manual section 
> regarding "training" your tuner.
> 
> GL!
> 
> Ken
> WA2LBI
> 
> 
> 
> 
> On Mon, Apr 19, 2021 at 2:05 PM Buck <radiok4ia at gmail.com 
> <mailto:radiok4ia at gmail.com>> wrote:
> 
>     I made up the cable from the Molex to the TUNE on the KAT500 as
>     described and have checked continuity from end to end.  All OK.
> 
>     I have the SEND from the 7610 connected to the PTT RLY on the KAT500.
> 
>     When I change bands, nothing happens.  Is there another setting I need
>     to change in the 7610?
> 
>     Buck, k4ia
>     Honor Roll
>     8BDXCC
>     EasyWayHamBooks.com
> 
>     On 4/19/2021 10:35 AM, Lyn Norstad wrote:
>      > Buck -
>      >
>      > The KAT500 Rev D1 Manual, pages 13, 14 and 15 cover the Icom
>     connections.
>      >
>      > The "AH4" cable (the one you're describing) powers the KAT500 and
>     controls
>      > the "Tune" function.  If yours isn't doing anything, the cable is
>     probably
>      > defective.
>      >
>      > What else do you have connected?
>      >
>      > 73
>      > Lyn, W0LEN
>      >
>      >
>      > -----Original Message-----
>      > From: elecraft-bounces at mailman.qth.net
>     <mailto:elecraft-bounces at mailman.qth.net>
>      > [mailto:elecraft-bounces at mailman.qth.net
>     <mailto:elecraft-bounces at mailman.qth.net>] On Behalf Of Buck
>      > Sent: Monday, April 19, 2021 7:42 AM
>      > To: elecraft at mailman.qth.net <mailto:elecraft at mailman.qth.net>
>      > Subject: [Elecraft] Controlling KAT500/KPA500 with Icom 7610
>      >
>      > Anyone who has succeeded, I could use some help.  The connection from
>      > the 7610 molex antenna tuner jack to the "Icom in" jack on the
>     KSAT500
>      > doesn't do anything.
>      >
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