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dave · July 19th 14, 03:04 PM posted to rec.radio.shortwave

On 07/18/2014 05:36 PM, wrote:
On Friday, July 18, 2014 12:29:27 PM UTC-4, Michael Black wrote:
On Fri, 18 Jul 2014, dave wrote:

On 07/17/2014 04:49 PM, Michael Black wrote:

On Thu, 17 Jul 2014, Scott Smith wrote:

SB-303 heathkit repairs, I bought a heathkit SB-303 radio off ebay,

all it gets are various tones when I tune the dial, any idea on

repairs, thanks in advance, email .

Does it have the crystals? If that's the ham band one (rather than the

one for shortwave), the crystals are the same frequency as used in the

full SB line of ham band equipment. Buying crystals these days has

become quite expensive, so if someone needed the crystals for whatever

reasons, they may have stripped a receiver, rather than buy the crystals

new, or find a set of crystals on the used market.

It's a receiver that tunes a 500KHz segement (I think around 3MHz) with

a crystal controlled converter ahead of it, a crystal needed for each band.

Michael

Anybody roll their own quartz crystals? You need an oven. Big bucks for

energy.

I gather the radio magazines did show how to make your own crystals, back

in the thirties.

I'm sure they started with a slab of quartz, and cut it down and started

grinding.

Michael

Very , very difficult. Even after it is close enough(!)in resonant frequency- there are a few MORE extremely critical parameters involved ... This is why true "Crystal Filters" were so expensive,even when they were mass produced ...

You can get nice 5 pole filters for about a hundred bucks can't you (I
haven't checked for a few years). For relatively wide band SWL cascaded
ceramic resonators should suffice).

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