[Boatanchors] Receiver questions

[Michael OBrien]

Hi all
I whould say hq-180(a) and sp-600
Mike

--- On Thu, 12/16/10, Ian Wilson <ianmwilson73 at gmail.com> wrote:

> From: Ian Wilson <ianmwilson73 at gmail.com>
> Subject: [Boatanchors] Receiver questions
> To: boatanchors at mailman.qth.net
> Date: Thursday, December 16, 2010, 12:16 PM
> I was using a Drake 2-B this morning.
> This receiver has some very nice
> things about it
> (the preselector, and the variable IF bandwidths). On the
> other hand, the
> product detector
> isn't very strong, and I imagine that front end large
> signal handling is
> moderate.
> 
> In the 3-30MHz range, what receiver(s) has(ve) the "best"
> (CW and SSB,
> primarily):
>   - performance in the presence of large adjacent
> interferers?
>   - product detector?
>   - legibility?
>   - audio?
>   - AGC?
>   - product detector?
> 
> Using tube-only technology, it seems to me that the best
> architecture for an
> HF receiver would
> be something like the Squires-Saunders(sp?) SS1:
>   - no RF amplifier
>   - beam deflection mixer (single conversion)
>   - crystal filter immediately following the mixer
>   - frame grid IF amplifier tubes (e.g. 6EH7)
>   - beam deflection product detector(?)
> 
> Questions:
>   - IF- or audio-derived AGC?
>   - audio? (Single-ended triode for AM? <g>)
>   - single conversion means problems with oscillator
> stability, or
> difficulties
>     with birdies if using heterodyne schemes.
> Double conversion is much
> easier
>     but significantly weakens the front end
> performance. What to do?
>   - how useful are audio CW filters?
> 
> I would like to look at real circuits, so observations
> about receivers for
> which
> schematics are readily accessible would be helpful.
> 
> 73, ian K3IMW
> ______________________________________________________________
> Boatanchors mailing list
> Home: http://mailman.qth.net/mailman/listinfo/boatanchors
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:Boatanchors at mailman.qth.net
> 
> List Administrator: Duane Fischer, W8DBF
> ** For Assistance: dfischer at usol.com ** 
> 
> 
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>