[Hallicrafters] Re: [Boatanchors] SX-115 Xtal oscillator question

[jeremy-ca]

It may also have been done if the owner was into 6M DX and used a converter 
with a 28 mHz IF. By doing so he could tune down to many foreign commercial 
and TV stations as propagation indicators.

What is your serial # ?   Mine is 15000  140053 The two groups of numbers 
are different sizes and Im assuming that the real serial is the latter and 
mine is #53 of that run.
Has anyone started a registry of the SX-115 or has production info?

Carl
KM1H

----- Original Message ----- 
From: "Bob Macklin" <macklinbob at msn.com>
To: "Paul Vasek" <w2ec at bmjsports.com>; <hallicrafters at mailman.qth.net>; 
<boatanchors at mailman.qth.net>
Sent: Monday, October 15, 2007 10:08 PM
Subject: Re: [Boatanchors] SX-115 Xtal oscillator question


> You have a SX-115 that has been modified to cover part of the CB segment.
>
> Bob Macklin
> K5MYJ
> Seattle, Wa,
> ----- Original Message ----- 
> From: "Paul Vasek" <w2ec at bmjsports.com>
> To: <hallicrafters at mailman.qth.net>; <boatanchors at mailman.qth.net>
> Sent: Monday, October 15, 2007 6:47 PM
> Subject: [Boatanchors] SX-115 Xtal oscillator question
>
>
>> I'm just starting to work on an SX-115 that needs some cleanup and a
> little TLC restoration. The oscillator crystals for WWV thru 10 meters 
> were
> not installed in their sockets but had come loose. In sorting them out in
> order to ensure they were all there, I found a strange situation involving
> one crystal. In the SX-115 there are four 10 meter band segments, each 
> 500kc
> wide, consisting of band 10-1 (28.0mc to 28.5mc), 10-2 (28.5mc-29.0mc), 
> 10-3
> (29.0mc-29.5mc) and 10-4 (29.5mc-30.0mc). According to the schematic, the
> oscillator xtals should be: 10-1 = 34.505mc, 10-2 = 35.005mc, 10-3 =
> 35.505mc, 10-4 = 36.005mc.
>>
>>   Heres my problem, I found the correct crystals for bands WWV, 80, 40, 
>> 20
> and 15 meters, plus those for 10-2, 10-3 and 10-4. I do have an additional
> crystal left over for band 10-1, howevr it is 33.505mc, NOT 34.505 mc as
> needed for band 10-1 (28.0mc to 28.5mc). Since I don't have the radio
> working yet I can't just plug in the crystal and see what I get when I
> select band 10-1. Doing the math it looks like a 33.505 crystal (assuming
> the circuit will oscillate OK) will have band 10-1 operating on 27.0mc 
> thru
> 27.5mc, which is pretty much the 11 meter CB band, what a co-incidence.
>>
>>   So I either have an SX-115 with a crystal that was mismarked 33.505mc
> instead of 34.505mc 40 some years ago, or someone modified their SX-115 to
> cover the 11 meter/CB frequencies. I'm guesing the latter, so does anyone
> have a spare 34.505mc crystal for an SX-115 in case I need one?
>>
>>   73, Paul W2EC
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>>
>
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> ** For Assistance: dfischer at usol.com **
> $ For vintage radio info, see the HCI web site $
> http://www.w9wze.net
>
>