[HBR] HBR progress - crystal question

[Bry Carling]

Anyone from the group still needing 3500 kc. crystals, I have some available.

Bry, AF4K

On 2 Apr 2012 at 17:08, Chris Howard w0ep wrote:
 
> I was working on an old Hallicrafters SX-11.  It has a crystal
> in the IF chain, between two transformers.
> 
> And, I happen to have a an old Valpey crystal module
> thingy, about the size of a golf ball, that says 81.962 on it.
> (It's chromed too.)
> 
> So I have some vague idea that, if I ever get my HBR
> working, maybe I should then go back and see if I
> can incorporate this crystal as a CW filter in the IF stage.
> 
> I'm mentioning the idea now because it may have a bearing
> on my mixing scheme if I want to use that.  My IF transformers
> are from the command set, 85 kHz.
> 
> Here's your opportunity to tell me this is/is not a good
> line of thought.
> 
> Chris
> w0ep
> 
> 
> On 4/2/2012 4:48 PM, Chris Howard w0ep wrote:
> >
> > I'm making progress on acquiring parts for my HBR project.
> >
> > Today I received in the mail a 3500 kHz crystal from
> > a command set, an ebay purchase.  It is in a metal octal
> > container with a little mushroom cap on top which
> > has 3500 printed on it.  I've found a reference
> > on the 'net which says I should use pins 3 and 7.
> >
> > An 0A2 voltage regulator tube is supposed to be
> > coming in the mail soon.
> >
> > I have transformer, rectifier and two chokes for the
> > power supply.  Some of my power supply parts are overkill
> > in size (8 hry 250 ma) but what's in the junkbox
> > is much cheaper than what's in a catalog. With the hefty
> > iron, I'm thinking it may be smart to use a separate
> > power supply chassis.  If I ever get smaller parts
> > I can build one on board.
> >
> > I have 85 kHz IF transformers. I think I'm doing
> > pretty well for tubes.
> >
> > So I have enough junk to build a power supply and
> > see if I can make the 3500 kHz calibration oscillator.
> > Then I'll go for the BFO and the audio section.
> >
> > Chris
> > w0ep
> >
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