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17th Nov 2008, 2:34 pm | #1 |
Retired Dormant Member
Join Date: Nov 2008
Location: dublin, republic of ireland
Posts: 3
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droitwich locked frequency standard
Does anyone have the circuit diagram for the radcom 1984 project?.I would like to build one to use as a frequency reference.Thanks!, terry lynch.
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17th Nov 2008, 4:24 pm | #2 |
Heptode
Join Date: Jun 2004
Location: Ilkley, West Yorkshire, UK.
Posts: 656
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Re: droitwich locked frequency standard
Terry, I have a 1978 RSGB publication that has an article detailing a design for a 200kHz frequency standard using the Droitwitch transmission which is used to control an otherwise free running oscillator in a phase locked loop intergrated circuit. It provides a 100kHz and a 1MHz output. Not sure if this is the one you're looking for but if you're interested I'll scan the article which includes the circuit, calibration and build details, and email it to you.
rgds Colin
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Colin Armstrong |
17th Nov 2008, 4:26 pm | #3 |
Nonode
Join Date: Aug 2007
Location: South Bradford, West Yorkshire, UK.
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Re: droitwich locked frequency standard
I should have a copy and can scan it when I get home.
I'm not sure if this was for Droitwich when it was on 200kHz or the current frequency of 198kHz. There was also a circuit for a 198kHz locked standard in PW about a year ago. Keith |
17th Nov 2008, 4:33 pm | #4 |
Moderator
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Location: Ipswich, Suffolk, IP4, UK.
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Re: droitwich locked frequency standard
See post 2 in this thread:-
https://www.vintage-radio.net/forum/...ad.php?t=23488 I still have the scans mentioned, but they are earlier than 1984.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
17th Nov 2008, 5:57 pm | #5 |
Retired Dormant Member
Join Date: Nov 2008
Location: dublin, republic of ireland
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Re: droitwich locked frequency standard
graham,that info would be very welcome!, thanks, terry lynch.
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17th Nov 2008, 6:02 pm | #6 |
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Re: droitwich locked frequency standard
PM me you email address then.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |
17th Nov 2008, 7:14 pm | #7 |
Retired Dormant Member
Join Date: Nov 2008
Location: dublin, republic of ireland
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Re: droitwich locked frequency standard
Graham, my e-mail address is- [email address deleted] Thanks! terry lynch
Please exchange email addresses using the Private Message system. You may not post an email address in the forum public areas. Paul Sherwin Forum Moderator |
17th Nov 2008, 8:04 pm | #8 |
Nonode
Join Date: Aug 2007
Location: South Bradford, West Yorkshire, UK.
Posts: 2,571
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Re: droitwich locked frequency standard
Having scanned the article from June 1984 Rad Com I'm posting it here as it's only a 400k file.
It appears that LW stations changed to a 9kHz spacing in 1988. From the article it was known that the frequency was going to change hence it was designed for either frequency. Keith |
17th Nov 2008, 8:32 pm | #9 |
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Re: droitwich locked frequency standard
I've emailed a copy of the standard described in "Test Equipment For The Radio Amateur" to terry lynch.
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Graham. Forum Moderator Reach for your meter before you reach for your soldering iron. |