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Re: [Yaesu] FT1000MP Rx Jack Isolation

To: jcowens1@comcast.net
Subject: Re: [Yaesu] FT1000MP Rx Jack Isolation
From: Tom Lappin W0UY <lappint@sbcglobal.net>
Date: Tue, 19 Jan 2010 07:58:01 -0600
List-post: <yaesu@contesting.com">mailto:yaesu@contesting.com>

I have used a similar set up with a MarkV MP radio and FT-1000D.  My 
transmitting antenna was an Inverted L and the receiving antennas were 
480 foot Beverages.  My transmitting antenna was about 400 feet from the 
receiving antenna using a maximum power of 800 watts on CW.  If you can 
not get good separation of the antennas I think you would want to 
disconnect the receive antenna during transmit using a reed relay or at 
least a silicon signal diode to conduct to ground if the voltage got 
above it's conduction voltage of 0.3 volts.  Another possibility would 
be a low voltage incandescent lamp like a #47 to conduct voltage to 
ground.  At one time there was a box available that controlled the 
receive antenna connection and prevented the linear PPT from turning on 
the amplifier before the receive antenna was disconnected.  Not sure 
that is still available but you could build something similar.

I don't profess to be an expert on this subject, just thought I'd pass 
along my experiences as food for thought.  Good luck with your 160 meter 
station, maybe I'll catch you on top band sometime.  This winter I am in 
Texas rather than Kansas and have no room for 160 meter antennas.


cowens1@comcast.net wrote:
> I am wanting to transmit high power to an Inverted L on 160M on the A 
> Connector while receiving on a separate anternna connecterd to the Rx jack on 
> the same band. Would like to speak with anyone doing similar, and what your 
> experiences are re isolation (relay disconnect on transmit, etc.). I am told 
> the the Rx jack is not isolated or muted on receive when transmitting on 
> either the A or B connector.
> JOhn Owens  -  N7TK
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