[Premium-Rx] Preselector for hf receiver

[Michael O'Beirne]

Hi there,

A slightly delayed response to your email.

I have a SURF and can confirm the excellence of the construction.

It has a characteristic impedance of 50 ohms and so can be used with any 
aerial or receiver or low power transceiver (NMT 40W PEP though).  You could 
therefore use it with a Wellbrook Loop which is designed for this impedance, 
but it has only low current DC continuity (to read the meter in the TURF 
ATU) and so you would have to modify it, but that would not be too taxing 
for a skilled chap like you!

The through loss is under 0.75dB when correctly aligned.  I have verified 
this with my TF2380 analyser.

A good bit of kit.

73s
Michael
G8MOB

----- Original Message ----- 
From: <GandalfG8 at aol.com>
To: <Premium-Rx at mailman.qth.net>
Sent: Saturday, May 26, 2012 11:53 PM
Subject: Re: [Premium-Rx] Preselector for hf receiver


> In a message dated 26/05/2012 22:37:51 GMT Daylight Time,
> enriqueeeeee2001 at yahoo.es writes:
>
>
> Sorry  to know that the Harris has a high noise  figure.
>
> I have seen some photos of the clansman SURF  preselector, it looks very
> well constructed inside. However it seems to be  mainly used with
> wires,dipoles and whip antennas and I use a loop , a  Wellbrook 330S, and 
> in a near
> future I would like to get an ALA  100M.
>
> My main interest  shortwave listening , tropical  band segment,  but it
> would be fine one starting on long  wave.
>
> It's said that the Redifon are quite good on  HF.
>
> Cheers
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