Dan, Most circulator manufacturers no longer offer low-band units, although they might custom-make one for you for perhaps $800 to $1,000. The least-expensive route is to find a used but working low-band isolator, and arrange with Telewave, EMR, or TX-RX to remanufacture it to your exact transmit frequency. Due to the physical constraints of the internal ferrite and magnetic components, low-band isolators cannot be tuned more than a few hundred kHz or so away from their original frequency. Since moving a low-band circulator or isolator to the 6m band normally involves grinding material away to raise the setpoint, it may be possible to modify it for a reasonable price- probably $300 or so. Some isolator manufacturers will refuse to work on a used unit if it has been opened. The advantage of having your isolator remanufactured is that it will be perfectly tuned to your frequency and will have a guarantee of workmanship.
73, Eric Lemmon WB6FLY -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dan Sent: Sunday, June 07, 2009 8:36 PM To: [email protected] Subject: [Repeater-Builder] Six-Meter Isolator Circulator Do you know where I can get a reasonably priced isolator or circulator for the six-meter band? I see lots of items for 2 meters, 1.25 meters, and 70 centimeters, but nothing for low band applications. Regards, Dan at K7MM, VU3MMW
