Might try using a 10x scope probe on the DFM or just measuring through a
50K resistor. I had a similar problem --just had to fiddle around with
the input R depending on the instrument.
Curt
KU8L
Adrian Rees wrote:
Nigel
Thanks for this. I think you are right. Off to find another way of measuring
this.
Thanks
Adrian MW1LCR
-----Original Message-----
From: Nigel Gunn G8IFF/W8IFF [mailto:[email protected]]
Sent: 20 January 2010 15:01
To: [email protected]
Cc: [email protected]
Subject: Re: [Drakelist] TR7
Your DFM might be 50R input impedance and killing the signal.
On 20-Jan-10 14:38, Adrian Rees wrote:
Hello all
Quick question about the TR7 PBT/Reference Board. According to the
manual I should have 40MHz on Pin 19. This pin is connected to a 470
Ohm Resistor then to coax and back to the Transistor. I should be able
to measure 40MHz on this pin. I can do that fine.
The next step in alignmnet is 13.695MHz VCXO adjustment. According to
the manual I should be able to connect a DFM to PIN 17 and adjust
L1005 for exactly 53.695MHz (13.695 + 40MHz). On Pin 17 I cant measure
anything. Zip. Although the RX is working fine.
Are the Pin outs correct, and how did Drake number the edge connectors
? Top down or ???
Thanks
Adrian MW1LCR
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