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LZ1AQ amp


 

In case anyone is interested, I bought an LZ1AQ type amp from Everett before Christmas and finally got it up today.? I'm using a 4 foot loop made from 1/2 hardline, fed with about 50 feet of RG6, and 8 feet AGL.? I was fat, dumb, and happy with my homebrew? amp based on the G8CQX design with a pair of 2N5109 transistors and a 3 foot loop of the same material but as a mobius.? The difference is amazing.? Just as a point of reference for myself , I am now receiving solid copy NAVTEX on 518Khz from Labrador and seeing signals from Greenland. ?Those stations where not even a squeak previously. Florida and PR boom in like they are local. I am in coastal NJ.? ? NDB stations are all over the place.? 160 and 80 are a pleasure with an S1 noise floor and very little reduction in signals from my transmitting antennas.? Good stuff!


 

Just received one myself. Still building out the box and loop. How far from the amplifier did you place the bias tee? Seems closer is better. I have been thinking about bnc-bnc the bias tee at the amplifier.?


 

No need to place it near the amp. I have mine in the "shack" next to my SDR.
Regards,
Simon

On Tue, Jan 28, 2025, 2:20?PM Superlite via <superlite17=[email protected]> wrote:
Just received one myself. Still building out the box and loop. How far from the amplifier did you place the bias tee? Seems closer is better. I have been thinking about bnc-bnc the bias tee at the amplifier.?


 

My bias tee is in the shack about 50 feet or more of coax run to the amp.? I built mine with a PTT trigger relay to cut the power to the amp during transmit.? I also included a DC filter board in the enclosure..because I had the room, so why not. ?https://www.amazon.com/dp/B09JLNYMGV?ref=ppx_yo2ov_dt_b_fed_asin_title