Hi Ian,
I had exactly the same problem with my XV 432 and scratched my head for some
time. The outcome was that I had during construction switched the coils to
be used for L4 and L19 (the two unshielded coils).
This had the effect of not allowing me to set the LO on frequency. it would
slide off
Hello Ian,
Comments below
On Fri, Jan 25, 2013 at 8:48 AM, Ian Greenshields
ian.greenshie...@gmail.com wrote:
Thanks for all the help and comments received so far, on and off reflector
- I have to say the responsiveness and quality of help on this reflector is
second to none!
To
The LO on my XV432 transverter seems to be very unstable. I think it's
something more than just temperature drift as the frequency will sometimes
jump by several kHz. It's almost as if the crystal is hunting between
different modes of oscillation.
Prodding wiggling the components in the LO
Ian,
Two possibilities occur to me. First, detune the LO inductors L3, L4
and L5 a bit to give you 3 volts maximum at TP1 and see if it stabilizes.
Secondly, try adjusting L4 a bit. It may be that the adjustment of L4
puts the crystal right on the 'hairy' edge of oscillation which would
Wasn't there some issue with the 78L09 at some point? I seem to recall
replacing the low-power versions with standard 7809s .. I'd have to
pop them open to check
de w1rt/john
On Fri, Jan 25, 2013 at 9:01 AM, Don Wilhelm w3...@embarqmail.com wrote:
Ian,
Two possibilities occur to me. First,
Not true on any XV series transverter I have worked on. The leads of a
7809 would not fit the board.
73,
Don W3FPR
On 1/25/2013 9:14 AM, John D'Ausilio wrote:
Wasn't there some issue with the 78L09 at some point? I seem to recall
replacing the low-power versions with standard 7809s .. I'd
Ian,
Does the LO frequency jump if you tap the crystal's can using a plastic
rod such as an alignment tool or pencil? If it does, and if all of the
soldered connections in the LO's circuit are sound, the jump and drift are
most likely caused by some mechanical fault within the crystal
Thanks for all the help and comments received so far, on and off reflector
- I have to say the responsiveness and quality of help on this reflector is
second to none!
To summarise:
1. I have tried detuning L4, along with L3 and L5. L4 is very sensitive as
is probably to be expected, L3 and L5
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