"Floyd Sense" <[EMAIL PROTECTED]> made an utterance to the drakelist gang
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Well, sometimes you just get lucky. I reheated all the solder joints on the
components involved in the oscillator and then gave the 13.695 Xtal a few
sharp raps with a wooden pencil (very scientific!). Reinstalled the PBT
board and now the oscillator can be adjusted properly and with more of the
slug inside the coil form than before. Thus far in the alignment process,
all appears well.
I spent some time researching purchase of a new crystal and spoke with an
engineer at International Crystal. They had no info on that particular TR7
crystal, but asked that I email him a scan of the oscillator schematic. It
turns out that crystals do change value with age and that can be quite a bit
over time, but nowhere near where mine appeared to be oscillating. He
speculated that the crystal may have not been working at all and that the
oscillator might just be free-running, hence the rather large frequency
error. I'm not qualified to pass judgement on that, but he may have been
right. At any rate, it's good to know that International is still a very
helpful organization and can provide just about anything you need in the way
of a crystal for a reasonable price. If you need band crystals for
something like an R4C, they have information on the rig and will tell you
exactly what to order.
73, Floyd - K8AC
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