Fw: RE: [HBR] THE BEST receiver

[Bob AH7I]

Pullen is good because of linearity.
Low distortion noise.
On 40m you really don't need much gain because of background noise.

Any CW signal copiable on the fanciest commercial RX out there, I can copy
on my National SW-3. Provided the band isn't too crowded with signals.
These days, unless there is a contest, that's the way it usually is.

Heck, I can copy most stuff on an el-cheap-o NE602 based single IC
RX from ramsey at $9.95 hamfest special price.

RX are kind of like cars or motorbikes. All will do the job of getting you
around if operating as they should. The rest is all optimization and fine
tuning for specific performance...

73,
-bob


On Fri, 29 Jul 2005 windy10605 at juno.com wrote:

> Yep, that brings up another point ....mixers. I've seen many articles on
> how much better Pullen mixers are from a noise standpoint. I think this
> is basically because it's made up from 2 triodes which would make it more
> quiet ....HOWEVER, the gain you see is much less than that of a
> Pentode/Pentagrid and by the time you add another stage to equal the
> gain, the total noise introduced may be back to the same level ??
>
> 73 Kees K5BCQ
>
> --------- Forwarded message ----------
> From: "Ian Wilson" <ianmwilson at earthlink.net>
> To: "'HBR Receiver List'" <hbr at mailman.qth.net>
> Date: Fri, 29 Jul 2005 07:25:51 -0700
> Subject: RE: [HBR] THE BEST receiver
> Message-ID: <001001c59449$738ed0b0$6902a8c0 at trabucoian>
>
> Tubes, like all other physical parts, generate thermal noise.
> Additionally, multigrid tubes like pentagrids generate 'partition' noise
> (caused by the random division of the electron flow between candidate
> targets).
>
> 73, ian K3IMW
>
> >
> > Tubes generate NO internal noise, as ALL "PN" junctions do, thus tubes
> ARE
> > quieter in the noise-floor department.
> >
>
>
> ************************************
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>
>
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> ************************************
> Visit the HBR Receiver Web Site with over 100 pictures of receivers and
> construction notes...... via http://www.qsl.net/k5bcq/
> there is also a mirror (faster response)at http://k5bcq.edebris.com/
>
>
> Retrieve reflector archived data via http://mailman.qth.net/mailman/listinfo/hbr
>
>