[HBR] HBR progress - crystal question

[Chris Howard w0ep]

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
>
> ______________________________________________________________
> HBR mailing list
> Home: http://mailman.qth.net/mailman/listinfo/hbr
> Help: http://mailman.qth.net/mmfaq.htm
> Post: mailto:HBR at mailman.qth.net
>
> This list hosted by: http://www.qsl.net
> Please help support this email list: http://www.qsl.net/donate.html
>
>