[1000mp] Mark V Field Receive Desense

[Thomas Otterbein]

Hi Hank, 

I had a similar problem with my FT-1000MP Mk V Field as you, may 
be caused by the same problem.
The receivers sensitivity going sometinme dramatically down. 
A short push to the PTT brings the sensitivity back.
I could also repeat it by switching between the RX-Antenna and 
Main-Antenna several times with the Rx-Antenna switch.
Sometime the muting also occur direct after switching on the transcv.

I found in my case that the the RL1002, RL1005 at the RF-Unit was 
responsible for the muting. This relays had contact problems.

I send the  transceiver to YEASU, they repaired it an it works no. 
The repair report was: exchanging relays at RF-Unit and modifying. 
I didn´t get a response what they modified.

I believe my RX-Antenna (connected to the RX-Antenna input at the 
transceiver) which is close to the transmitting antenna was the 
reason. May be it brought to high rf-voltage to the relays. 

I think the best way is to let it check by Yeasu.

By the way, in the 1000MP archieves you can find several messages describing
this circumstances.


73 de Thomas
DG8FBV
 ---
mailbox at Otterbein-INet.de
www.Otterbein-INet.de






> -----Original Message-----
> From: 1000mp-bounces at mailman.qth.net
> [mailto:1000mp-bounces at mailman.qth.net] On Behalf Of Hank Lonberg
> Sent: Samstag, 15. Januar 2005 20:46
> To: 1000mp at mailman.qth.net
> Subject: [1000mp] Mark V Field Receive Desense
> 
> 
> I have a fairly new 1000 MP Mark V Field. During the NAQP
> test just now and actually for some time now the receive 
> desenses after I transmit. This doesn't occur every time but 
> quite often. It takes 10 plus seconds to come back up to full 
> value. This makes running a pileup hopeless as you can't hear 
> the response. I had a very good run going on 15m and had to 
> quit due to the problem.
> 
> My question is what is the culprit and is there a fix?
> 
> Thanks in advance
> 
> Hank / KR7X
> IH9P Pantelleria Contest Team
> Tikirriki Contest Club
> 
> 
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