At 06:29 AM 3/12/2007, Edward Cole wrote:
At 05:15 AM 3/12/2007, Stargate wrote:
Is a sequencer needed when using a 160w switchable preamp from ARR? (Advanced Receiver Research)
Thanks, RoD KD0XX
Let's analyze this:
You send a voltage to run the preamp. It needs voltage to switch to Tx mode. When RF from your transmitter arrives it switches over to bypass the preamp. I would guess if you turn off the power to the unit, it can't operate correctly, so how is a sequencer going to help? I have not owned one of these units so not familiar with their power wiring. If you have two 12 volt power contacts then you might run the preamp separately from a sequencer.
I had one thought after I sent the above: if the ARR switchable preamp defaults into bypass when unpowered, then you could connect it like any other preamp using a sequencer. When the sequencer shuts off power to the preamp it would switch into transmit configuration bypassing the preamp circuit. I would read the literature with the preamp to ascertain how it operates or contact ARR and ask them.
73, Ed - KL7UW ====================================== BP40IQ 50-MHz - 10-GHz www.kl7uw.com 144-EME: FT-847, mgf-1801, 4x-xpol-20, 185w DUBUS Magazine USA Rep dubususa@hotmail.com ======================================