Hi Gary Ah you need 274kHz for the feed to the EXT pin it goes to the input
of a divide by two to give square wave drive to the PA stage. Still you
should be getting more than that out of it. It sounds as though something is
not right...50mV is far too low. Is there a LPF on the output?? It may be
that there is a component problem there.
Cheers de Alan G3NYK
----- Original Message -----
From: "G4WGT - Gary" <[email protected]>
To: "Rsgb_Lf_Group" <[email protected]>
Sent: 02 February 2004 21:21
Subject: LF: Re: G0MRF 300w Tx & DDS VFO
Hi to Alan, David, Laurence & LF,
Thanks for your replies & suggestions, I was not able to get any output
with
any of the arrangements. I then put the DDS VFO on the scope & found that
the output at 137 KHz is only 50mV P-P & at 15 MHz is still low at only
300mV then its down to 50mV at its high end of 40 MHz, so its no were near
its so called spec of 1V P-P. I will have to investigate further. May be
the
answer is an intermediate amplifier.
73
Gary - G4WGT
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