Jim, TNX,
The receiver I was referring to with audio derived AGC was my early model
Argo 505. And I too built an outboard audio filter, with both SSB and CW
bandwidths selection. In and out jacks were used on the 505's rear apron and
yes, it all was ahead of the AGC point and worked great.
73, Roy K6XK/0
-----Original Message-----
From: Jim Loase <jloase@ozline.net>
To: Roy Koeppe <royanjoy@ncn.net>
Cc: tentec@contesting.com <tentec@contesting.com>
To: <tentec@contesting.com>
Date: Monday, January 25, 1999 7:20 AM
Subject: Re: [TenTec] questions
>
>Roy,
>Your statement here is generally true but there is one rig the TenTec
Argonaut
>509 that used audio for the agc. Then they added an out board filter that
plugs
>into the rig and inserts itself in the agc line. I have one of these and
built
>my own filter . I am always amazed at how well this works. I always figured
that
>the agc should be in the IF but for the 509 at least it works very well.
>
>Regards
>Jim Loase
>
>Roy Koeppe wrote:
>
>> Greg,
>>
>> One big difference between using audio filters, as opposed to IF filters
for
>> CW is that the audio filter does not activate the receiver's AGC. So,
it's
>> common to have an interfering signal pass through a wider IF filter, and
>> "pump" the receiver's AGC, while it is being rejected in the narrower AF
>> filter's bandpass.
>>
>> See the dilemma? You can't hear what's doing that dastardly deed to you!
>> (Some receivers do use use audio-derived AGC, and I like the way they
>> perform then with narrow AF filters AHEAD of the AGC circuit).
>>
>> 73, K6XK
>>
>> -----Original Message-----
>> From: Greg Deiss <deiss@camasnet.com>
>> To: tentec@contesting.com <tentec@contesting.com>
To: <tentec@contesting.com>
>> Date: Sunday, January 24, 1999 10:29 AM
>> Subject: [TenTec] questions
>>
>> >
>> >Dear group,
>> >
>> >I have a couple of questions I'd like to bounce off of you.
>> >
>> >What is the practical (audible) difference between using a CW audio
>> >filter (#224) and 8 pole "ladder" filters (#217 or #219). I have a
>> >reasonable understanding of the design differences; how do they differ
>> >in use? Has anybody done some "side-by-side" listening on these?
>> >
>> >Secondly, I just took possession of an Alinco DJ-500T dual-band HT. I
>> >am fairly certain that the antenna it came with is not original and not
>> >correct for the radio. Does anybody out there have one of these that
>> >can give me physical specs or a description of the proper antenna for
>> >this radio?
>> >
>> >Thanks in advance.
>> >
>> >Greg, kl7qx
>> >
>> >--
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>> >
>>
>> --
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>
>
>--
>FAQ on WWW: http://www.contesting.com/tentecfaq.htm
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>Administrative requests: tentec-REQUEST@contesting.com
>Problems: owner-tentec@contesting.com
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>
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