[Yaesu] FT-1000D T/R Switching

[Warren Robinson]

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
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