I'm looking at a pair (not physically yet) for VHF.
Pair?
They are in a cabinet which has seen better days but the cavities look good. He said they
are 6" in diameter (4 ea) and they have a tuning stub mounted on each one with a "T".
Best guessing is the Q204 series. Currently tuned to 146 range. Any thoughts? Value?
Looks like an old Q202G.
Issues that I would be concerned about:
I don't remember ever seeing hose clamps on the tuning assembly on any Sinclair cavities - there was always a setscrew. I have to wonder if there was an issue with noise, buggered-up threads, or something else that precipitated adding those hose clamps that are choking the threaded female side of the fine-adjust.
Figure you'll need to replace those old RG213 cables for starters.
Are any of the cavities noisy from age/oxidation?
Was this duplexer actually ordered for 146 MHz and 600 kHz split, or something else? From the looks of it, one of the dielectric tuning rods is near its end of travel, whereas all of the others have a lot of length extended, so I would question the "currently tuned to 146 range" as being valid, or even if they will tune to a 600 kHz split.
With the above questions unanswered combined with the time/money you'd need put into it, I'd say the as-is value approaches zero. If you had more info on it, including that the cavities weren't noisy, maybe it's worth something...perhaps $100 or $150 tops. My opinion anyway. Personally, I wouldn't put the time or money into a duplexer that old (on the order of 40 years), but that's just me...
--- Jeff WN3A
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