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Vintage Amateur and Military Radio Amateur/military receivers and transmitters, morse, and any other related vintage comms equipment.

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Old 16th Sep 2014, 5:48 pm   #1
G8BBZ
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Default 10XJ versus 10XAJ

Hi All,
Does anybody know the difference between the 10XJ style of crystal and the 10XAJ. Are they mechanically interchangeable? If so, are they electrically interchangeable?
cheers
Peter G8BBZ
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Old 16th Sep 2014, 5:52 pm   #2
HamishBoxer
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Default Re: 10XJ versus 10XAJ

10XJ is a pretty large crystal ,not found anything about xaj.
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Old 16th Sep 2014, 7:23 pm   #3
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Default Re: 10XJ versus 10XAJ

The differences ;
10X 3mm pins 20mm spacing. The body is typical Bakelite held on by screws with a rubber seal. The quartz is held between two sprung plates.
10XAJ 3mm pins soldered on to 1.2mm pins 13mm apart. If the outer pins are desoldered will plug into a HC6U socket. Metal can, solder seal, about half size of 10X.
Some equipment was fitted with 3 hole sockets that could accommodate both types.
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Old 16th Sep 2014, 7:40 pm   #4
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Default Re: 10XJ versus 10XAJ

What's the rock actually being used for?

In times-past it was considered OK to drive crystals rather hard - one recommendation in the 1920s/1930s was to wire a 6-volt 60mA filament-bulb in series with the crystal and not drive your oscillator/PA to too much brightness.....
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Old 16th Sep 2014, 10:24 pm   #5
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Default Re: 10XJ versus 10XAJ

Crystals are for Burndept BE201 VHF Tx/Rx.
10XJ crystals are in short supply these days so I am looking for alternatives.
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Old 17th Sep 2014, 8:07 am   #6
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Default Re: 10XJ versus 10XAJ

Any particular channel freq you're looking for Peter? I see the TX crystal is Fc/18 and RX Fc-9.72/18, which is around 8 and 7 MHz for Two metres. Could have a rummage in the rock boxes here if you have a ball-park frequency to look for.
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Old 17th Sep 2014, 9:13 am   #7
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Default Re: 10XJ versus 10XAJ

Quote:
Originally Posted by G8BBZ View Post
Crystals are for Burndept BE201 VHF Tx/Rx.
There's a blast from the past: I used to have one on 2M. Deaf as a post, and in terms of amps-in for RF-watts-out it must also have set some records as an underachiever.

For the crystals I used wander-plugs and short lengths of 14gauge wire to connect them to sockets for more-traditional HC6/HC18 type xtals. The BE201 doesn't drive the crystals any harder than, say, a valve Pye Vanguard.
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Old 17th Sep 2014, 8:02 pm   #8
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Default Re: 10XJ versus 10XAJ

I see I misread your post ! 10XJ was about the same size as 10XAJ, but used a phenolic
case with a labelled metal side held in by screws. Most of those I've seen are of US origin
marked FT-243 often with a channel number.They have the same pin spacing as 10XAJ.
http://www.twradio.co.uk/TW2%20Transmitter.html
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Old 17th Sep 2014, 9:29 pm   #9
Sean Williams
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Default Re: 10XJ versus 10XAJ

I think I have quite a lot of 10X type crystals here - I want them gone.....
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Old 19th Sep 2014, 1:55 pm   #10
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Default Re: 10XJ versus 10XAJ

Any chance of there being a 5317 kc amongst them, Sean? Or even better 2658.5?

73

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Old 19th Sep 2014, 3:06 pm   #11
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Default Re: 10XJ versus 10XAJ

Hi All,
Thanks to all who responded.
Sean/Roger - if you have anything in the range 5100kHz to 8333kHz I would be interested. No particular application in mind - there is little enough 2m activity in this part of the world on FM/SSB never mind AM. I am looking for a range of crystals which will the operation of the radio to be demonstrated - not used in anger!
Perhaps you could PM me if you have anything suitable.
Thanks again to all
Peter G8BBZ
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Old 22nd Sep 2014, 10:17 pm   #12
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Default Re: 10XJ versus 10XAJ

OK Peter, I'll have a look when I can get past the pile of gear in front of the shelf that has the crystal collection! I do have several 5-5.9 MHz rocks, some that are tantalisingly close to 60 metre spot frequencies or bandlets but just to far away to be of use, they might suit your needs. 8 MHz, not so many but I'll look and P/M.

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Old 23rd Sep 2014, 11:27 am   #13
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Default Re: 10XJ versus 10XAJ

Quote:
Originally Posted by G8BBZ View Post
Sean/Roger - if you have anything in the range 5100kHz to 8333kHz I would be interested.
Peter,

Are you sure about the receive crystal calculations being 5 MHz? The manual I downloaded from the VMARS site shows the receiver crystal to be FC-9.72/18, so for 145 MHz that is 7.515555 kHz for the crystal. I have my crystal collection boxes where I can get at them now, but wanted to be sure we agree on the offset before I start searching thru several 100 rocks!

By my manual, for the TX to operate in the band 144-146 MHz, the rocks should be between 8.0 and 8.1111 MHz. Te same receive range is 7.46 to 7.571 MHz

73

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