[Yaesu] FT-1000D T/R Switching

[dgmaley at inav.net]

Good Morning to all.  Worked on this radio last night
and thought I would pass along what I found:
Replaced this diode with a standard 1N4007 power supply
diode.  Seems to work just fine.  I did this after using
the NTE cross reference and noting this is just about what
it crossed to.  I would have suspected this to have been
a spot for a hefty PIN diode, but maybe not.
My next project is to check the muting relay inside the
second receiver bandpass filter network.  I suspect
it's not working.  I'm also building up my arm muscles
just lifting this radio <grin>.
Thanks for the help.
Dave  WA0ZZG
AR

Yaesu 
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Re: [Yaesu] FT-1000D T/R Switching
from [Warren Robinson] [Permanent Link][Original] 

To:  <dgmaley at inav.net>, <yaesu at contesting.com> 
Subject:  Re: [Yaesu] FT-1000D T/R Switching 
From:  "Warren Robinson" <warren at rakon.co.nz> 
Date:  Wed, 2 Jun 2004 07:48:11 +1200 
List-post:  <mailto:yaesu at contesting.com> 

Hello Dave,
Had a similar problem with spurs every 15KHZ (Approx).
These were very strong at 150 -300Khz.
I changed the GM-3B  diode and this made no difference.
The 15 Khz oscillation was coming from the transistors and 
RF chokes
around the diode. In the end I sent it to YAESU SERVICE in 
CA.
They had to replace the LPF board to fix this problem.
Hope this has been of some help
Warren ZL1AIX


----- Original Message ----- 
From: <dgmaley at inav.net>
To: <yaesu at contesting.com>
Sent: Wednesday, June 02, 2004 6:26 AM
Subject: [Yaesu] FT-1000D T/R Switching


> Good Afternoon.  I've been tracking a receiver problem
> on my 1000D that showed up as multiple spurs on all bands.
> It looks like the switching diode on the LPF board is very
> leaky.  The receiver is switched out of line, during xmit,
> by a relay and it looks OK.  This diode switches the xmtr
> output to the antenna.  Yaesu service manual shows it to
> be a type GM-3B diode.  NTE cross reference crossed it to
> a standard power supply diode. Before I try a 1N4007 in
> the circuit, has anyone had experience replacing this 
> diode with good results?  Thanks in advance.
> Dave WA0ZZG
> AR
> _______________________________________________
> Yaesu mailing list
> Yaesu at contesting.com
> http://lists.contesting.com/mailman/listinfo/yaesu
> 

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