Re: Norton Amplifiers


Conrad, PA5Y
 

That looks very useful Neil but a bit too much gain.

I am glad that you weren't dreaming because to dream of such things would be a little, dare I say, odd?

73

Conrad


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Neil Smith G4DBN via groups.io <neil@...>
Sent: 19 May 2021 20:43
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Norton Amplifiers
 
Note dreaming after all. Phew. This is the Appnote I vaguely recalled.
Looks like it is about the ZRL-700+ (and the other models)

https://www.minicircuits.com/appdoc/AN60-039.html

Neil G4DBN

On 19/05/2021 19:23, Conrad, PA5Y wrote:
> Could you be referring to the HELA10B dual monolithic amplifier? I have a pair of these on my 2-channel adaptive EME system. They are there to overcome splitter losses and give a bit of extra gain for the IQ+. The path for one channel is HELA10B (11db gain 2.5dB NF on 144) then a Band pass filter, then a 3dB hybrid splitter. One side feeds the IQ+ (used for the adaptive RX) and the other my transverter which is used a linear polarisation (either +/- 45 deg) channel with the K3S.  The whole system seems to work very well.
>
> I will try one on 432 but the noise figure is significantly higher on the 4 that I built.
>
> https://www.minicircuits.com/app/AN60-009.pdf
>
> You need a heatsink!
>






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