[Collins] 51J series input coil antenna requirements.

[Dr. Gerald N. Johnson]

On Thu, 2008-05-01 at 18:23 -0400, Bill wrote:
> I couldn't find the antenna impedance for the 51j-2 in the manual but 
> one of the RF tuning sections said to feed the sig gen through a 270
> (250?)
> ohm resistor to one leg of the input and ground the other input.

Signal generator output probably 50 ohms, so that hints at a 300 input
characteristic impedance.
> 
> Of course I did see what the output impedance of the sig gen was.
> 
> Since the 51j-2 is transformer coupled, there is no antenna trim cap.
> 
Which is not to say that with an imperfectly matched antenna that an
antenna trimmer might not improve receiver performance.
-- 
73, Jerry, K0CQ, Technical Advisor to the CRA
All content copyright Dr. Gerald N. Johnson, electrical engineer