I can offer a little help.
The FT1000D second receiver front-end module has a small rf sens relay
built in but the trip point is set way too high to do any good. I
modified the circuit so that it would trip the relay before the front end
overloaded. The second receiver never overloads nor do I have to worry
about a rf burnout.
Dave
WA0ZZG
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> Today's Topics:
>
> 1. FT1000MP Rx Jack Isolation (jcowens1@comcast.net)
> 2. Re: FT1000MP Rx Jack Isolation (Tom Lappin W0UY)
> 3. Re: FT1000MP Rx Jack Isolation (G4GED Dave)
> 4. Fw: FT1000MP Rx Jack Isolation (Paul Playford)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Tue, 19 Jan 2010 00:04:11 +0000 (UTC)
> From: jcowens1@comcast.net
> Subject: [Yaesu] FT1000MP Rx Jack Isolation
> To: Yeasu Reflector <yaesu@contesting.com>
> Message-ID:
>
> <835593507.10646661263859451659.JavaMail.root@sz0050a.emeryville.ca.mail.comcast.net>
>
> Content-Type: text/plain; charset=utf-8
>
>
>
> 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
>
> ------------------------------
>
> Message: 2
> Date: Tue, 19 Jan 2010 07:58:01 -0600
> From: Tom Lappin W0UY <lappint@sbcglobal.net>
> Subject: Re: [Yaesu] FT1000MP Rx Jack Isolation
> To: jcowens1@comcast.net
> Cc: Yeasu Reflector <yaesu@contesting.com>
> Message-ID: <4B55BA69.6060102@sbcglobal.net>
> Content-Type: text/plain; charset=UTF-8; format=flowed
>
> John,
>
> 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.
>
> 73
> Tom
> W0UY
>
> 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
>> _______________________________________________
>> Yaesu mailing list
>> Yaesu@contesting.com
>> http://lists.contesting.com/mailman/listinfo/yaesu
>>
>
>
>
> ------------------------------
>
> Message: 3
> Date: Tue, 19 Jan 2010 14:49:10 -0000
> From: "G4GED Dave" <radiodave.g4ged@tiscali.co.uk>
> Subject: Re: [Yaesu] FT1000MP Rx Jack Isolation
> To: <jcowens1@comcast.net>, "Yeasu Reflector" <yaesu@contesting.com>
> Message-ID: <C136B74F1B674B07B511E721EFF96C9C@SN046981320192>
> Content-Type: text/plain; format=flowed; charset="UTF-8";
> reply-type=original
>
> ----- Original Message -----
> From: <jcowens1@comcast.net>
> Subject: [Yaesu] FT1000MP Rx Jack Isolation
>> 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. >
>
> John,
> This question has arisen before on this or some other Reflector.
> I thought the consensus of opinion was that the RX Only port was either
> disconnected or earthed during Transmit.
> It would be nice if someone fully knowledgible could catagorically confirm
> this please?
>
> Anyway, I've been using the RX only port on my FT-1000MP to various
> co-sited
> RX antennas whilst transmitting high power on 160m to an Inv L for the
> past
> 5 years without any problems. (Hope I'm not tempting providence!)
>
> 73 Dave
>
>
>
> ------------------------------
>
> Message: 4
> Date: Tue, 19 Jan 2010 09:53:35 -0700
> From: "Paul Playford" <paul@w8aef.com>
> Subject: [Yaesu] Fw: FT1000MP Rx Jack Isolation
> To: "Yaesu@contesting.com" <yaesu@contesting.com>
> Message-ID: <04B9B21389F84523A690D11987C39ACD@Desktop>
> Content-Type: text/plain; format=flowed; charset="iso-8859-1";
> reply-type=response
>
>
>
> --------------------------------------------------
> From: "Paul Playford" <paul@w8aef.com>
> Sent: Tuesday, January 19, 2010 09:52
> To: "G4GED Dave" <radiodave.g4ged@tiscali.co.uk>
> Subject: Re: [Yaesu] FT1000MP Rx Jack Isolation
>
>> I have been looking at the technical supplement and I don't see anything
>> that disconnects or grounds the RX ANT port during transmit.
>>
>> Not disconnecting and/or grounding the RX ANT port during transmit can
>> allow transmit rf to enter the radio via the RX ANT port creating hash
>> and
>> garbage on your transmit signal that, without a monitor scope on the
>> transmit output, you will not be aware of, but your neighbors sure will.
>>
>> de Paul, W8AEF
>>
>> ZF2JI/ZF2TA FO8DX/FO8PLA 8Q7AA XZ0A VU7RG TX5C
>>
>>
>> --------------------------------------------------
>> From: "G4GED Dave" <radiodave.g4ged@tiscali.co.uk>
>> Sent: Tuesday, January 19, 2010 07:49
>> To: <jcowens1@comcast.net>; "Yeasu Reflector" <yaesu@contesting.com>
>> Subject: Re: [Yaesu] FT1000MP Rx Jack Isolation
>>
>>> ----- Original Message -----
>>> From: <jcowens1@comcast.net>
>>> Subject: [Yaesu] FT1000MP Rx Jack Isolation
>>>> 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. >
>>
>>
>
>
> ------------------------------
>
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>
> End of Yaesu Digest, Vol 85, Issue 5
> ************************************
>
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