[Elecraft] Station Monitor

[Dave]

There's an article in this months QST that might do what you are looking 
for, it's in Technical Correspondence on pages 58 and 59 headed "Use a 
Signal Sampler to Monitor Your Transmitted Signals" written by Larry D. 
Wolfgang (WR1B).  The designer is given, at the end of the article, as being 
Bud Colclough (K1LC).  There's an address and an email address for K1LC 
given at the end of the article as well.

Basically, it looks like a VSWR meter but with an output to a 50 ohm BNC 
connector in place of the more usual meter.  50 ohm microstripline joins an 
input and an output socket, half way down the stripline is a tap off via a 
capacitor to a resistive divider circuit (with decoupling capacitor) to an 
output socket giving a -60dB output on the frequency being monitored.

The designer says that he's tesed his circuit up to 600W and believes that 
it could handle full legal (in the USA) power from 1.8MHz to 30MHz.

Might be worth a look.

Dave (G0DJA)

----- Original Message ----- 
Sent: Wednesday, January 01, 2014 2:31 PM
Subject: [Elecraft] Station Monitor


>
> HNY all:
> Apropo of the recent discussions on "dirty" RF I have been considering
> putting together a "station monitor" to monitor my RF output.  I have a K3
> (7588) but also an ICOM 7200, Drake TR7A, Drake C-line & a couple of 
> amps.  I
> have a 70MHz occilliscope that I would like to place between amp  & feed
> line to various antennas.  I want to make sure my CW & SSB  output is 
> clean
> without clicks or splatter, especially at higher output.   This would 
> allow me
> to see if there is any effect on waveform from the amp  compared to the
> transmitter output as well.  Some sort of attenuator is  needed to protect 
> the
> 'scope but also to make sure it doesn't change  the impedance the amp or
> tuner sees.  I understand the Bird wattmeters  have such a "sniffer" 
> circuit.  I
> also understand the 'scope alone may not  be sufficient for such a 
> "station
> monitor". Any suggestions would be greatly  appreciated.  If this is not
> appropiate for this reflector, I apologize,  and would be happy to take
> replies off list.  Tnx & hny to all.
>
> 73 Mike DeLong KD8RQE