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Vintage Test Gear and Workshop Equipment For discussions about vintage test gear and workshop equipment such as coil winders. |
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16th May 2010, 7:20 pm | #21 |
Octode
Join Date: Oct 2007
Location: Exeter, Devon, UK.
Posts: 1,553
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Re: which frequency counter ?
I wonder if we are confusing ourselves about two different types of counter, when people say "such and such is too fussy to use". There is the straightforward frequency meter, like the Racal 9915 series, and the Black Star 600. Usually with two inputs, one to 50Mhz, direct into TTL dividers, and the 120Mhz to 500Mhz upwards, which use a decade divider in front. Usually the ubiquitous Plessey/GEC SP8000 series, eg SP8630 to 500 Mhz, SP8660 to 150Mhz etc.
Then the elaborate and much more tricky to use Counter-Timers, which measure frequency, time intervals etc etc, like the Philips PM6611 to PM6615 series, the Marconi TF2416 or TF2438, Venner/Malden 7737 and lots of Systron Donner/EMI models. I use both a Racal 9915 and the Philips 6615, whichever comes to hand when measuring just frequency. I can help with circuits or manuals of all those I mention, and SP8000 data sheets. I have a copy of a neat circuit/PCB published by Siemens using a common TV divider which goes to 1.2GHz and divides by 100, so will work with almost any "old" counters. I keep planning to make it up. 4 IC's on a scrap of board. Bill m0wpn |
16th May 2010, 9:17 pm | #22 | |
Pentode
Join Date: Aug 2009
Location: Sheffield, South Yorkshire, UK.
Posts: 167
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Re: which frequency counter ?
Quote:
Much obliged-Roger. |
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17th May 2010, 11:44 am | #23 |
Octode
Join Date: Oct 2007
Location: Exeter, Devon, UK.
Posts: 1,553
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Re: which frequency counter ?
Having mentioning a pre-scaler, I then had to search for it. Success, just when I began to think it was lost.
Two circuits. One from RSGB in 1978, using an rather low sensitivity standard ECL decade divider with a pre amplifier, which I find works works well up to 200Mhz using the 95H90. Then the Siemens circuit, which uses a prescaler intended for TV or Mobile use. The clever bit is the extra TTL which converts x64 to x100. These TV/mobile pre-scalers are much cheaper and more easily available than the decade ones. I intend to make up the Siemens circuit. Some time after the original application note by Siemens, a journal (Elecktor) published the PCB layout, so that is included. Sending by email to Roger M0TDM. Bill m0wpn |
17th May 2010, 4:17 pm | #24 |
Retired Dormant Member
Join Date: May 2010
Location: Portsmouth
Posts: 2
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Re: which frequency counter ?
When I try opening the service manual pdf I get sent to a "you are not logged in page", but I clearly am. and if I log in as requested I get sent back there. I can open any other link or pdf that I try but not this one, I don't understand it. Have you got any ideas. Sorry to be a pain - John.
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17th May 2010, 5:21 pm | #25 |
Pentode
Join Date: Aug 2009
Location: Sheffield, South Yorkshire, UK.
Posts: 167
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Re: which frequency counter ?
Dont have a problem here might be something to do with your security settings in internet explorer. PM me your email and i'll send it you direct...
regards-Roger. |
5th Jun 2010, 2:17 am | #26 |
Retired Dormant Member
Join Date: Jun 2010
Location: Manchester , UK
Posts: 2
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Re: which frequency counter ?
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5th Jun 2010, 9:07 am | #27 |
Nonode
Join Date: Aug 2007
Location: South Bradford, West Yorkshire, UK.
Posts: 2,571
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Re: which frequency counter ?
Jupiter 500 user manual. I don't have the service manual but the 8038 function generator IC datasheet may be useful.
Keith |
5th Jun 2010, 2:59 pm | #28 |
Retired Dormant Member
Join Date: Jun 2010
Location: Manchester , UK
Posts: 2
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Re: which frequency counter ?
Thanks for the Jupiter 500 manual - you're a star !
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