[Moon] 432MHz LNAs current state of the art.

[Máximo EA1DDO_HK1H]

Hi Conrad,

Hope you are good.

I am sure you know Sam G4DDK´s VLNA70, it is quite good too;
http://www.g4ddk.com/VLNASept13.pdf
http://www.g4ddk.com/

Another very low noise preamp are made by Pete WA2ODO.
He is reachable here; pmanfre at gmail.com
Pete uses to announce his preamps for sale in this list; test-equip-trader at groups.io

My two pence. Hope this helps.

73, Maximo EA1DDO


-----Original Message-----
From: Moon [mailto:moon-bounces at moonbounce.info] On Behalf Of Conrad PA5Y via Moon
Sent: lunes, 27 de septiembre de 2021 13:51
To: moon at moonbounce.info
Cc: 'pe1itr. com'
Subject: [Moon] 432MHz LNAs current state of the art.

Hello I currently use a VLNA 432 from HA8ET or a VHF Design EME LNA, both use the SAV541+ and claim to have noise figures of <0.3dB. I have several of these LNAs and measure between 0.28 and 0.35dB which is very good but of course how much can I really trust a Noise Com NC346A and an Mauri Microwave (Alitect) 2075 noise figure meter? I have an R&S FSV with the FSV-K30 Noise figure application at work and the correlation between the systems is good.

However I seem to be 1dB down on what I expect from celestial sources. Maybe it is antenna pattern and noise ingress. I am using a PGA103+ as a second stage with a very good band pass filter in between.

I would like to know what the current state of the art is for 432MHz LNAs. If I can be sure of my first stage LNA then I can start looking at other factors. I have small system and every scrap on RX counts. There are more QRP stations on 432 than I am accustomed to on 144MHz, I would like to have a shot at hearing them.

To those who are suffering noise on 144 you could do worse than give 432MHz a try, it is an excellent EME band. It is so nice to hear an even undisturbed noise floor again!

73

Conrad PA5Y
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