Antenna

[JeffreyAllenPederson]

36 Megacycles transmitter length ?

 

[rjenkinsgb]

One wavelength is 300,000,000 (speed of light in metres/sec) / frequency in Hz.
Or for convenience use (300 / frequency in megahertz),

300 / 36 = 8.333 Metres wavelength.

How that applies to an antenna depends on the antenna type:

A quarter wave ground plane would be approx. 219cm; a quarter of the wavelength, * 0.95 "end correction", allowing for the lowering in frequency caused by the antennas own capacitance.

 

[JeffreyAllenPederson]

Got is Monopole is 12 inches I used a clip lead, I think it is working changed to 32 MC as it is slightly longer running 102.1 Aberdeen W.A. through an old EICO 324 . I hope the FCC does not send me a nasty letter !

 

[JeffreyAllenPederson]

Yours says 86 inches I do not know Thanks for the info. I will play around with it. I will build a simple RF sniffer !

 

[danadak]

Just as an aside you can get fairly accurate testing using a Nanovna, a low cost Vector Analyzer.

NanoVNA | Very tiny handheld Vector Network Analyzer

Very tiny handheld Vector Network Analyzer

nanovna.com

https://www.pvrc.org/Powerpoint/NanoVNA%20IntroductionCombined-2.pdf

Look at youtube, ebay. Banggood for offerings, various display sizes/revisions/performance/price.


Regards, Dana.

 

[unclejed613]

I hope the FCC does not send me a nasty letter !

i used to have one of those eico generators, and they only put out a few milliwatts...

the complete manual for it can be found here: https://archive.org/download/eico_e...4/eico_model_324_rf_signal_generator_1954.pdf