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KAT100 Won't Tune When IC706 Also Turned On

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Gottlieb, Jonathan

KAT100 Won't Tune When IC706 Also Turned On

Any thoughts on this one: Today I hooked up an antenna switch so I could run the K2/100 and the ICOM 706 and switch between them and use one or the other when I want to. Both radios run off the same Astron SS-25 power supply. When I have the 706 turned on and RX only, the KAT100 will not tune 40 or 80 meters. If I turn off the 706, the KAT100 works perfectly. It tunes all other bands with the 706 turned on. The 706 is only receiving so I wouldn't think it would be drawing enough current to effect the K2. Any ideas on this gremlin?

Jonathan Gottlieb
WA3WDK
K2/100 #4856
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Don Wilhelm-3

RE: KAT100 Won't Tune When IC706 Also Turned On

Jonathan,

We need to understand your setup with the new switch included a bit better
before giving a proper answer, but I will 'go out on a limb' and make some
assumptions to see if it provides you with a quick answer.

Where did you put the switch? If it is between the K2/100 and the KAT100,
that would be a reasonable explaination for your problem - the KAT100 must
be connected to the K2 on both the coax and the interconnecting cable to
tune properly (RF must flow during the tune operation). The switch must go
on the antenna side of the KAT100 - and if it is located there and the 706
is connected to the antenna for receive, you will attempt to tune the KAT100
into an open circuit if the K2 TUNE button is pressed.

Another possible answer (guess) is that the 706 is putting DC on the coax
(for use with an external preamp maybe?) and somehow interferes with the
tuner operation.

73,
Don W3FPR

> -----Original Message-----
>
> Any thoughts on this one: Today I hooked up an antenna switch so
> I could run the K2/100 and the ICOM 706 and switch between them
> and use one or the other when I want to. Both radios run off the
> same Astron SS-25 power supply. When I have the 706 turned on
> and RX only, the KAT100 will not tune 40 or 80 meters. If I turn
> off the 706, the KAT100 works perfectly. It tunes all other
> bands with the 706 turned on. The 706 is only receiving so I
> wouldn't think it would be drawing enough current to effect the
> K2. Any ideas on this gremlin?
>
> Jonathan Gottlieb
> WA3WDK
> K2/100 #4856
>

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Gottlieb, Jonathan

RE: KAT100 Won't Tune When IC706 Also Turned On

In reply to this post by Gottlieb, Jonathan

Here is the set up: Two antennas come into the house to an MFJ two position switch, antenna A and B. A three foot run of RG8X goes to a second MFJ two position switch, Xcvr A is K2, Xcvr B is IC-706. That's it. I set the antenna switch to antenna A or B, and then choose which xcvr to use, the K2 or the 706. When I switch between the xcvrs, one is connected directly to the antenna, and the other is switched out of line.

Jonathan
WA3WDK

-----Original Message-----
From: W3FPR - Don Wilhelm [mailto:[hidden email]]
Sent: Saturday, August 20, 2005 4:29 PM
To: Gottlieb, Jonathan; [hidden email]
Subject: RE: [Elecraft] KAT100 Won't Tune When IC706 Also Turned On

Jonathan,

We need to understand your setup with the new switch included a bit better
before giving a proper answer, but I will 'go out on a limb' and make some
assumptions to see if it provides you with a quick answer.

Where did you put the switch? If it is between the K2/100 and the KAT100,
that would be a reasonable explaination for your problem - the KAT100 must
be connected to the K2 on both the coax and the interconnecting cable to
tune properly (RF must flow during the tune operation). The switch must go
on the antenna side of the KAT100 - and if it is located there and the 706
is connected to the antenna for receive, you will attempt to tune the KAT100
into an open circuit if the K2 TUNE button is pressed.

Another possible answer (guess) is that the 706 is putting DC on the coax
(for use with an external preamp maybe?) and somehow interferes with the
tuner operation.

73,
Don W3FPR

--
No virus found in this outgoing message.
Checked by AVG Anti-Virus.
Version: 7.0.338 / Virus Database: 267.10.13/78 - Release Date: 8/19/2005

____________________________________________________________________________________________________________

CONFIDENTIALITY NOTICE: The information contained in this e-mail is confidential, may be legally privileged, and is intended only for the use of the party named above. If the reader of this is not the intended recipient, you are advised that any dissemination, distribution, or copying of this e-mail is strictly prohibited. If you have received this e-mail in error, please immediately notify us by telephone and destroy this e-mail.
____________________________________________________________________________________________________________
_______________________________________________
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Post to: [hidden email]
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