[AMPS] TL-922 Filament Transformer Protection

[Rich Measures]

>
>Rich,
>Subject:        	Re: [AMPS] TL-922 Filament Transformer Protection
>Date sent:      	Sat, 5 Jun 1999 23:39:42 -0700
>From:           	Rich Measures <measures@vc.net>
>To:             	<W8JI@contesting.com>, <amps@contesting.com>,
>       	"Peter Sundberg" <sm2cew@telia.com>
>
>I wrote:
>> >VHF oscillations will not arc bandswitches because they are 
>> >shunted to ground  by the low reactance of the tuning cap. 
>> 
>> €  As I recall, during the grate parasitics debate, Mr Rauch disclosed
>> that had measured self-resonances in Tune-caps that were in the 100 to 200
>> MHz range.  
>
>The "omission of fact" that you used to distort the answer was that 
>the particular capacitors I measured with high VHF low UHF 
>resonances contained SERIES resonances, where the impedance 
>went through a wide DIP in impedance.
>
€  What is the likely Z of a high-Q series-resonant circuit on 
frequencies above and below the frequency of resonance?  As I recall, you 
measured an AL80 Tune-C series-resonance at c. 180MHz, and the parasite 
took place c. 160MHz.  

>You did the same thing with the measurements N7WS made on 
>suppressors. It seems to be your pattern.

€   According to Wes' measurements, there was about a 40% decrease in 
VHF-Q with the resistance-wire suppressor compared to the copper-wire 
suppressor.  Are you suggesting that more suppressor Q equates to more 
stability? 

-  later, Tom. 


Rich...

R. L. Measures, 805-386-3734, AG6K, www.vcnet.com/measures  


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