W???QFC wrote:
Happy Holidays to all list members!
Again, I must call for help from this great group.
I want to use my 5302A to measure the frequency of a high power transmitter (50 watts +), so how would this be done?
Would I construct some sort of 'RF pick-up loop and if so, how would I do it?
As always, I really appreciate the help.
73,
Gene, W???QFC (OK on QRZ)
Spring Hill, Florida 34606
WEB SITE:
Gene,
Check
It uses a common T BNC connector adapter, a short piece of coax cable with a BNC plug, a resistor and a BNC socket.
I put the T in series with the output of the transmitter (between the Tx and the antenna or the load (better)) and the standalone BNC goes to the counter through another BNC cable. If you want to, you can simply cut a BNC cable somewhere in the middle and put the resistor in series with the center conductor. Adjust the resistor value to provide the right attenuation, i.e. to get 5 mW into the counter, which should be safe, from a 50W Tx, you need 40dB of attenuation, which is a ratio of 100 in voltage. If the counter has 50 ohm input, you put a 5k resistor in series and you are done.
I use the same setup to inject a low level signal from a signal generator into the RF input of a receiver for instance.
Good luck es 73,
Didier KO4BB
