>
>
>sorry for the late reply - spamcop has the whole of the UK's biggest ISP
>blocked so I couldn't post to the reflector. I'm trying this through a
>webmail account.
>
// My ISP is rabidly anti-spam - yet SpamCop managed to label him a
source of spam, which naturally blocked yours truly. Perhaps SpamCop was
created by spammers?
cheers
>-----Original Message-----
>From: Steve Thompson <g8gsq@qsl.net>
>To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
>Date: 17 January 2002 07:38
>Subject: Re: [AMPS] rc feedback and "pills"
>
>
>>
>>-----Original Message-----
>>From: skipp isaham <nospam4me@juno.com>
>>To: amps@contesting.com <amps@contesting.com>
To: <amps@contesting.com>
>>Date: 17 January 2002 02:52
>>Subject: [AMPS] rc feedback and "pills"
>>
>>
>>>
>>>-
>>>Thanks Steve, I didn't mention it at the time,
>>>one can find feedback to reduce the entire stage
>>>gain at lower frequencies and across the actual
>>>device(s). Sometimes both in the same circuit.
>>>-
>>>One purpose is to level the stage gain, the other
>>>to prevent "or cure" problems.
>>
>>Indeed - you can always add a rfc in the path if gain levelling isn't
>>needed. In the manufacturing side, hfe is deliberately kept low where
>>possible to help prevent instability problems, but the circuit designer has
>>to do their bit too. It's interesting, and often frightening to redraw a
>>circuit as it looks at lf. There's often no damping at all, and what you
>>draw is the circuit of an oscillator. I much prefer to try and get the bias
>>and supply loading right, so the stability is there without the feedback
>>components.
>>>-
>>>Other than your pill information below, the only
>>>mention of pills as rf transistors that I have seen
>>>has been by CB'er amp hacks "because they
>>>look like pills." They weren't using "pill" because
>>>they were on the manufacturing side of the device.
>>
>>For sure - I guess there was a common root to the usage.
>>
>>Steve
>>
>
>
>
>--
>FAQ on WWW: http://www.contesting.com/FAQ/amps
>Submissions: amps@contesting.com
>Administrative requests: amps-REQUEST@contesting.com
>Problems: owner-amps@contesting.com
>
>
- R. L. Measures, a.k.a. Rich..., 805.386.3734,AG6K,
www.vcnet.com/measures.
end
--
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