I acquired a Phelps Dodge 636 3/3 mobile duplexer tuned for TX freq. of 163.8xxx and a RX freq. of 167.5xxx. What I was wondering was if this could be tuned down into the ham band with any success for a mobile repeater using some hand held radios. I was looking in my Tessco catalog and saw that this unit resembles the RFS Celwave 636-6A-3/3 with specifications of: Freq. range 164-174 Mhz, max power 50 watts, min. separation 4.5 Mhz, insertion loss 1.2 db, isolation 80 db both TX and RX. I then looked at the the RFS Celwave 636-6A-1/3, which is exactly the same aappearanceand specs. except for the freq. range, which is 144-154 Mhz. That made me question, are these duplexers the same only tuned from the factory differently giving it the slightly different model number. Or are they completely different inside and not worth the trouble of retuning. The tuning rod are sticking out a good ways, about an inch. So maybe there
is some room for adjustment. If anyone has messed around with a ssimilarunit or has any info on this unit and could share their stories of success or other wise (if I should just toss it as useless junk) I would greatly appreciate the info.
Thanks for all the good info on this list, T.J.
73 KC8LTS
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