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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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17th Dec 2014, 6:56 pm | #21 | |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
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Re: 1-500MHz frequency counter
Quote:
Given that the prescaler as-designed had about a 10mV VHF sensitivity, the extra series-resistance didn't cause any problems. This was good-enough protection that the prescaler survived having 15 Watts of RF shoved up it on rather more than one occasion. |
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17th Dec 2014, 6:57 pm | #22 |
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Re: 1-500MHz frequency counter
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17th Dec 2014, 7:11 pm | #23 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
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Re: 1-500MHz frequency counter
BNC [or for preference N] for things on the outsides-of-instruments, but fitting a BNC or a N to a modern microscopic SMD PCB is a real pain. Using SMA on-board makes sense - a short flexible lead to your connector-of-choice on the actual case means you remove connect/disconnect stresses from the PCB.
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17th Dec 2014, 8:18 pm | #24 |
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Re: 1-500MHz frequency counter
The advantage of BNC is that if you try a 50ohm one into a 75 socket, no damage unlike Ns.
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18th Dec 2014, 7:08 am | #25 | |
Pentode
Join Date: May 2014
Location: Amsterdam, Netherlands
Posts: 202
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Re: 1-500MHz frequency counter
Quote:
Still, had I owned test equipment with SMA sockets I'd put a BNC-F->SMA-M adapter on it. Unless it's for microwave frequencies. Tjerk, 9ZZ |
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15th Oct 2015, 11:56 pm | #26 |
Dekatron
Join Date: Nov 2009
Location: Lincolnshire, UK.
Posts: 4,985
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Re: 1-500MHz frequency counter
I’ve revived this thread as there’s been two other threads started by different people on the same subject, and this thread has the most appropriate thread title for anyone looking for information regarding these great little frequency counters.
I always think it’s a shame that different threads get started with unrelated titles on the same pieces of kit, although this is understandable. It would be a bit of a mammoth, or even impossible task for anyone to try to edit all three threads into one complete and informative thread, so I’m going to put a link to the most recent thread, which doesn’t have a related title at the time of typing this post, although has a link back to this one, but also a link to the other thread (which does have a related title) which is in the hidden section (until a high enough post count) of the forum – complicated? Hopefully, anyone doing a ‘search’ for information on these counters will be able to find what they want to know a bit easier now as I feel that these cheap little units are a very useful piece of kit for the vintage radio enthusiast. Link:- https://www.vintage-radio.net/forum/...d.php?t=120297 |