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Robb, you can't just use two separate antennas and not get interference problems. If the two GP's are mounted one above the other by a couple wavelengths you will have some isolation due to the nulls but it won't be enough to overcome desense. Desense is when the rx sensitivity is severely degraded due to the frontend being creamed by an extremely strong sigbal, which the tx would pose, and you needthe rx operating at the same time as the tx. BTW, as for duplexers, you rarely if ever get a used unit tuned for your freq pair. Most hams that have the ability to build a repeater also have the ability and equipment to retune them.

[QUOTE="Captain Kilowatt, post: 361678, member: 39"] Robb, you can't just use two separate antennas and not get interference problems. If the two GP's are mounted one above the other by a couple wavelengths you will have some isolation due to the nulls but it won't be enough to overcome desense. Desense is when the rx sensitivity is severely degraded due to the frontend being creamed by an extremely strong sigbal, which the tx would pose, and you needthe rx operating at the same time as the tx. BTW, as for duplexers, you rarely if ever get a used unit tuned for your freq pair. Most hams that have the ability to build a repeater also have the ability and equipment to retune them. [/QUOTE]

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