[TowerTalk] Two radio overload?

[Michael Tope]

Doug,

Put a 1/8 watt 50 ohm resistor in place of the 756PRO, and then run the other
station full tilt boogie key down for a few minutes to see if the 1/8 watt
resistor gets warm. That will give you a baseline as to about how much power
you are dumping into the 756 PRO (1/8 watt ~ +20dBm). If you have a scope
with > 30 MHz BW, you can actually measure the voltage across the resistor
and get a better estimate of the coupled power. Compare this with the specs
on the radio. I don't have a real good feel for this, but I would start to get
concerned at around +10 dBm. If the band is hot enough, you might be able
to run some attenuation ahead of the 756 PRO receiver as an extra margin of
safety. I used a pair of back to back diodes on 160 successfully to keep the 
fuse in an MFJ Noise Cancellor from blowing when the sampling antenna 
was close to the transmit antenna. 

73 de Mike, W4EF............

----- Original Message ----- 
From: <W0AH@aol.com>
To: <towertalk@contesting.com>
Sent: Wednesday, December 06, 2000 7:38 AM
Subject: [TowerTalk] Two radio overload?


> A friend of mine and I plan to operate this weekend's 10M test and are 
> thinking of using his IC-756PRO barefoot connected to a 3 element monobander 
> at 40' pointing mainly toward the Carribean and South America.  My FT-1000 
> and Titan 425 at one KW out will be connected to the KT-34XA at 40' pointed 
> mainly at Europe or Asia/Pacific.
> Question.  With the towers and antennas about 90' apart do we risk damaging 
> the fronts ends of the transceivers, especially the IC-756PRO?
> Can anyone suggest an better way to use the second transceiver for South 
> America plusS+P while running with the FT-1000 and amp.
> Doug  W0AH
> 
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