[AMPS] Network analysis of suppressors

[Tom Rauch]

> What W8JI probably meant to say (and I *did* say, at that time) was that
> the use of nichrome in the suppressors made more difference to the Q at HF
> than it did at VHF. From N7WS's measurements, that was totally beyond
> dispute.
> 
> This would mean that for the same degree of effectiveness in suppressing
> parasitics at VHF, the losses in the nichrome suppressor at HF would be
> higher.


That's right Ian.

The primary advantage of nichrome in a suppressor is it lowers the 
HF Q more than it lowers the VHF Q.

On amplifiers with HF parasitics, that's a good thing. On amplifiers 
with VHF parasitics, it doesn't mean a thing. A conventional R/L 
suppressor would do just as well at VHF with only a minor change.

By the way, the nichrome suppressor submitted in the test was 
nothing like Rich's normal suppressor that he sold. The nichrome 
suppressor tested had a lot more inductance.

If you compare Rich's normal  suppressor with a stock AL-80B 
suppressor the stock AL-80B suppressor provides lower VHF Q 
than the Measures suppressor.


73, Tom W8JI
w8ji@contesting.com

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