km1h @ juno.com wrote:
>>
>>With a wide enough choice of R and L values, it is ALWAYS possible to
>>reproduce Rp, Lp and therefore Q, at ONE frequency. There is
>>absolutely
>>no doubt about that. Naturally you would choose the frequency of the
>>VHF
>>parasitic resonance in the PA that you're trying to suppress.
>
>
>Which is roughly determined to be the frequency of the highest amount of
>G-P feedthru...is that a valid assumption Ian?
Maybe... but it isn't directly relevant to this thread which is
basically about the network itself, not how you'd use it.
>In other words, the significant difference between the
>>two
>>types of suppressor is not at VHF, where their performance can be made
>>almost identical. The main difference is at HF.
>
>
>Contrary to other comments, I could not measure any meaningful power
>difference between either type on 10M in either a SB-220 or a TL-922.
>Have you run any actual tests at power Ian?
>
>Another point that disturbs me greatly is that the AG6K suppressor in
>the N7WS article does not come even close to matching what is shipped in
>Rich's kits or in his 2-11-96 5 page flyer. Rich....am I
>missing something basic here??
>
As far as I remember, the suppressors were supplied to Wes by Rich and
by Tom. The surprising thing is that the measured parameters ever came
CLOSE enough to allow some comparison.
> IMO, this appears to throw a big WHOA into the discussion. Just what did
>Wes measure???
>
>At this moment I think we need to consider a new evaluation from a less
>involved and seemingly biased source. I would suggest a test at the ARRL
>lab that is witnessed by at least a representative of both sides.
>
Well, Wes originally was such a source - just a guy who offered to help
because he had access to the equipment and was an uninvolved party. Even
now, nobody is disputing the actual measurement data, only the
interpretation.
73 from Ian G3SEK Editor, 'The VHF/UHF DX Book'
'In Practice' columnist for RadCom (RSGB)
http://www.ifwtech.demon.co.uk/g3sek
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