Hello group,
In early February, I mentioned that I have the x-lock installed on my TR7 and
generally find it a very good modification. I wanted to follow up on that
comment to include one minor annoyance.
As best I can tell this is an annoyance for any huff-puff circuit installed
using the RIT line for frequency lock control. I believe that a more complex
installation of a huff-puff circuit could fix this, but have not had time to
analyzed it closely.
A huff-puff (x-lock included) circuit using the TR7's internal RIT line as
frequency lock control does not understand dual PTOs that are present with an
active RV7. This appears to be because the TR7's RIT voltage is common to both
the internal PTO and the RV7's PTO. Since the x-lock fully supports RIT, this
only presents an issue if you are chasing DX and need to run the RV7 for wide
frequency splits.
I still highly recommend the x-lock modification to stabilize the TR7. I have
no monetary interest in x-lock or it's company Cumbria Designs.
73,
Ron WD8SBB
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