I guess I'm a bit slow but what is the buffer in tom's lash up for? and also
Steve where is a good source for a variety of different sizes of ferrites?
I haven't used those very often. Thanks, 73
Ed K7UC
----- Original Message -----
From: "Steve Forst" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Saturday, April 09, 2011 6:21 AM
Subject: Re: looks like it's back to the head scratching on my 20-meter RFI
Problem
> Tom,
>
> I agree. You can get a cable on ebay for about 20 bucks. I'd be
> surprised if the rig buffer is your problem, but stranger things have
> happened. You could always add ferrites to the RCA cables between the
> buffer and amp.
>
>
> If it were me, I'd run the full set up, as is, on the second antenna and
> see if there is the same problem. If you isolate it to the DXCC, you
> are half way home. This would be a good time to have a dummy load that
> will handle full power from your amp, to see what happens when the
> antennas are out of the equation.
>
> BTW, a few months ago, you had mentioned an interest in adding a LDG
> break out box to your wish list. If you have one in the shack, use
> the supplied 8 pin din from the 480 to the box, then RCA cables to the
> amp. This way you get the buffer out of the system without spending
> money on a cable you may not need once you find the real problem.
>
> 73, Steve KW3A
>
>
>
> On 4/8/2011 10:56 PM, John Miller wrote:
>> You can get cables on eBay or I think amaratron now has them, where you
>> can
>> connect the radio directly to the amp and you don't need any boxes or
>> anything, probably cheaper on ebay and might be worth a shot.
>> ----- Original Message -----
>> From: "tom behler"<[log in to unmask]>
>> To:<[log in to unmask]>
>> Sent: Friday, April 08, 2011 9:40 PM
>> Subject: looks like it's back to the head scratching on my 20-meter RFI
>> Problem
>>
>>
>>> Hi, all.
>>>
>>> Well, Bob Heil checked out my Heil GM5 mic, Kenwood interface cable, and
>>> FS2
>>> foot switch in his lab with his TS480 and amplifier, and couldn't
>>> replicate
>>> my 20-meter RFI problem.
>>>
>>> So, it looks like it's back to the drawing board for me.
>>>
>>> You may recall that I had the original RFI problem when using my Alpha
>>> Delta
>>> DXCC antenna, and when using the FS2 foot switch, so, I think something
>>> is
>>> creating an RF ground loop somewhere.
>>>
>>> You also may remember that if I plug the amplifier cable on the foot
>>> switch
>>> directly into the amplifier relay jack, it partially keys the amplifier,
>>> even without my pressing the foot switch.
>>>
>>> I am considering four things to try when I get back home from Missouri:
>>>
>>> 1. Trying the original set-up on my Carolina Windom 160 Compact, since
>>> that
>>> antenna was not working when I initially experienced the problem.
>>>
>>> 2. Taking the ARB704 buffer box completely out of the circuit, although
>>> I'm
>>> not sure how I'm going to directly hook up my Ameritron AL811H
>>> amplifier
>>> to
>>> the remote jack on the TS480. The remote interface cable I now have has
>>> two
>>> mini-din plugs, while there is no jack to accommodate such a plug on my
>>> Ameritron amp.
>>>
>>> 3. Purchasing and installing the 1 to 1 line isolator balun from the
>>> wire
>>> man that Kevin suggests, at least for the Alpha Delta DXCC antenna; and
>>>
>>> 4. Making a 20-meter counterpoise wire like some suggest, with one end
>>> connected in the shack, and the other hanging out the shack window.
>>> Regarding that counterpoise wire, should it be 15 or 16 feet long, and
>>> where
>>> do I connect the shack end?--to the ground lug on the TS480, or to the
>>> common ground lug on my MFJ window feed through panel?
>>>
>>> If anyone has comments on any of these four strategies, or if anyone has
>>> any
>>> other suggestions of things to try, please let me know.
>>>
>>> Thanks, and 73 from Tom Behler: KB8TYJ
>>
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