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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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16th Aug 2010, 4:57 pm
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#1 |
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Retired Dormant Member
Join Date: Aug 2010
Location: Bristol, Avon, UK.
Posts: 31
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Where did I get this crystal holder and why?
Hi all,i just discovered this item in a box of assorted RF items i have,the details below are whats written on the unit.Sorry about pic clarity...my dslr is in for a service.
Navy Type CRV-40062 Crystal Holder For Model 7BS-4 Transmitter Serial -5600 Cut - v Total Dev (cant read that) Channel Freq - 72.100 Cal Temp - 25 c Navy Dept Bureau of Ships by Radio corporation of America Contractor-General Electric The unit has an anti tamper wire and seal in place and unbroken. Does anyone have any history of this or know if its worth anything? |
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16th Aug 2010, 5:24 pm
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#2 |
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Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Where did i get this crystal holder and why?
Sounds as though its out of a Collins though Bendix is another transmitter.
David gm8jet |
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16th Aug 2010, 5:25 pm
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#3 |
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Dekatron
Join Date: Aug 2007
Location: W.Butterwick, near Doncaster UK.
Posts: 8,932
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Re: Where did i get this crystal holder and why?
Only value apart from historical is if anyone needs one.
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16th Aug 2010, 7:02 pm
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#4 |
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Octode
Join Date: Jan 2004
Location: Southport, Merseyside, UK.
Posts: 1,156
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Re: Where did i get this crystal holder and why?
Looks like a standard FT243 crystal, except for the anti tamper wire.
John |
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16th Aug 2010, 8:47 pm
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#5 |
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Retired Dormant Member
Join Date: Aug 2010
Location: Bristol, Avon, UK.
Posts: 31
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Re: Where did i get this crystal holder and why?
Hi,definately not a FT243 type as the pins on this are about an inch apart...on a FT243 there 1/2" apart.
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16th Aug 2010, 11:44 pm
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#6 |
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Octode
Join Date: Feb 2009
Location: Bletchley, Buckinghamshire, UK.
Posts: 1,219
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Re: Where did i get this crystal holder and why?
I used to have some of these but they were in blue enamel, not red. The pin spacing is the "10X" size and they were used in WW2 US Navy transmitters. There are some good websites about that kind of equipment - try looking up the 7BS-4 via Google.
Not worth anything really, maybe a pound to a collector. |
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17th Aug 2010, 12:49 am
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#7 |
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Rest in Peace
Join Date: Jun 2006
Location: Chard, South Somerset, UK.
Posts: 7,457
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Re: Where did i get this crystal holder and why?
I suspect that "Channel Freq - 72.100" refers to the final O/P freq. of the transmitter when this crystal was inserted. Therefore, "72.100" will not be the actual crystal freq. The first thing I would do is to try to determine the actual freq. of the crystal - this, if anything - will go a long way to determining just what it is actually worth.
Al. / Skywave. |
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20th Aug 2010, 1:04 pm
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#8 |
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Pentode
Join Date: May 2010
Location: West London, UK.
Posts: 102
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Re: Where did i get this crystal holder and why?
Isn't this the size that the B40 uses? I haven't got mine any more to check
 NHH
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B.Rgds Nick H. BVWS member |
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20th Aug 2010, 1:37 pm
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#9 |
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Rest in Peace
Join Date: Dec 2008
Location: Burton upon Trent, East Staffordshire, UK.
Posts: 1,686
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Re: Where did i get this crystal holder and why?
Pin spacing for B40 crystals appears to be just under 3/4".
It's not easy to measure 'down the hole' Alan |
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21st Aug 2010, 8:09 am
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#10 |
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Retired Dormant Member
Join Date: Aug 2010
Location: Bristol, Avon, UK.
Posts: 31
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Re: Where did I get this crystal holder and why?
Many thanks for all the replies
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