On 4/30/2020 10:39 AM, Bob kb8tq wrote:
At 1.5 GHz something like a 50 to 100 pf NPO is probably the best
pick for a blocking cap.
Why? It does a fine job at the intended frequency. It acts as a high pass
down lower where lightning energy is a bit higher ….
Hi Bob and all,
You are 100% correct! I decided to look up my notes on my modification
and I see that I did use a 100 pF NPO cap versus the 0.01 uF value I
originally mentioned. I should know better than to try to remember
anything off of the top of my head like that. :(
I'll bet that I used 100 pF based on discussions here, as it's almost
impossible I would have made the right choice on my own! I'm a
mechanical engineer, after all... ;)
I also found my VNA test results: my modified splitter was -9.1 dB loss
at 1.525 GHz. :) Theoretical should be 7.8 dB, so it's not great, but
it's not horrible either.
Works just fine - feeding two Trueposition units, an NTP server, a
lightning detector, and a uBlox M8N. When my HP Z3801 was working, it
was on the sixth port...but it went nuts about six months ago and since
I had the TruePosition units, I never bothered to do more than basic
troubleshooting on it.
thanks much and 73,
ben, kd5byb
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