Re: Steve ugly-build LZ1AQ using MPS2222 sweeps uploaded to Photos

Everett N4CY All Messages By This Member #19686 When Sweeping a LZ1AQ amp you need to use a 1:1 transformer between the VNA and the amplifier. You also need to calibrate the VNA on the amp side of the 1:1 transformer. What I use for a 1:1 transformer is a BN73-302 binocular core with 6 turns on each side. ? Steve and I both use the SDR-KITS VNA, which does very good job. ? Everett N4CY? In a message dated 7/12/2024 3:27:41 PM Central Daylight Time, davearea51a@... writes: ? toggle quoted message Show quoted text I'd also suggest -50 or -60 dBm input through the CM to DM transformer.? With gain, -30 dBm is a bit much to assure remaining in the linear region.? Used as the '2222 are in the amp, I have no idea of the IP1 (1 dB output compression power). ? And, yes, absolutely use a CM to DM 1:1 transformer on the input.?? ? Dave - W?LEV On Fri, Jul 12, 2024 at 6:29?PM Caaarlo via <caaarlo=[email protected]> wrote: While replying to steve I realized I might be close to saturating the VNA input. So I will insert an attenuator after LZ1AQ output and see how it goes. ? ? -- Dave - W?LEV

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