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Robyn T-240D alignment points?
- Thread starter Crambone
- Start date
you can get the schematics http://www.cbtricks.com/radios/robyn/t_240d/graphics/robyn_t_240d_om_sch.pdf
all i can remember is the tune and load is in the back left side and the modulation is right side behind speaker ...all these adjustments are on top chassis not underneath,,,,that is all i ever adjusted to make mine work into a pdx400,, i had back in the early 80s,,,,,,,
Thanks, I see the 2 power tune points but wasn’t sure of the modulation so that’s 1 down.
Shadetree Mechanic
Delaware Base Station 808
Now all you need is some toluene to soften the hard white enamel the factory dribbled onto all the tuning slugs. This stuff did a bangup job of preventing the slugs from slipping out of place while traveling across the Pacific ocean on its trip from Japan.
But it's hard, and glues the brittle ferrite tuning slugs firmly in place. Resist the impulse to just keep twisting the alignment tool harder until you hear a "CRACK!" sound. That sound means the slug has now fractured. After this happens, twisting the alignment tool simply forces the broken halves of the slug outwards against the inside of the coil form. Like the centifugal clutch in a moped.
Bad juju when that happens. Be very stingy dribbling toluene into the coil forms. Too much of it and the glue holding the coil from the the base will come loose. Breaks the wires inside the metal can when that happens.
These radios perform reasonably well when they're aligned properly. Changing a tube connected to one or more of these slug-tuned circuits will usually change the peak adjustment on that coil. Don't change tubes that aren't bad. Just muddies the water.
73
But it's hard, and glues the brittle ferrite tuning slugs firmly in place. Resist the impulse to just keep twisting the alignment tool harder until you hear a "CRACK!" sound. That sound means the slug has now fractured. After this happens, twisting the alignment tool simply forces the broken halves of the slug outwards against the inside of the coil form. Like the centifugal clutch in a moped.
Bad juju when that happens. Be very stingy dribbling toluene into the coil forms. Too much of it and the glue holding the coil from the the base will come loose. Breaks the wires inside the metal can when that happens.
These radios perform reasonably well when they're aligned properly. Changing a tube connected to one or more of these slug-tuned circuits will usually change the peak adjustment on that coil. Don't change tubes that aren't bad. Just muddies the water.
73
Shadetree Mechanic
Delaware Base Station 808
I got one of those a while ago. I will hook it up and talk on it today.https://www.worldwidedx.com/threads/robyn-t-240d-executive.233524/
Shadetree Mechanic
Delaware Base Station 808
Plate modulation mod. I have not tried this yet.
https://www.worldwidedx.com/threads/robyn-t-240d-plate-modulation-mod.141069/
https://www.worldwidedx.com/threads/robyn-t-240d-plate-modulation-mod.141069/
Shadetree Mechanic
Delaware Base Station 808
I forgot about this thread.
https://www.worldwidedx.com/threads/robyn-t-240d-plate-mod-for-justin.18355/
https://www.worldwidedx.com/threads/robyn-t-240d-plate-mod-for-justin.18355/
Thanks for the heads up, do you need straight toluene or does something like nail polish remover work as it’s toluene based?
Thank, sounds like the plate mod can cause more trouble than it’s worth. Will just use power mike and tune on the scope for best mod.