Re: LF: Re: IC706 vs TS850

[Rik Strobbe <rik.strobbe@fys.kuleuven.be>]

Bryan,

if only (the lack of) selectivity is a problem and not sensitivity I
would recommend to insert a (passive) bandpassfilter in front of the
RX.
QRM/QRN level at 136 kHz is that high that even a few dB insertion loss
won't do any harm.
With my Kenwood TS440 and a tuned inverted-L antenna (12m high, 22m long)
I could insert  a 30 dB attenuator and the band noise was still a
lot stronger than the RX noise.

73, Rik  ON7YD / OR7T

At 08:40 9/06/2006 -0400, you wrote:

In a message dated 09/06/2006 12:35:12 GMT Standard Time, captbrian@ukonline.co.uk writes:

Thanks for that.  It certainly helps _me_.   I have a 706/2/g but no 850.

The front end of my 706 is so wide it recieves all the world at the same

time !  but I am only one mile from a MW broadcast station .

  I can see I need at least a V.  narrow tuned pre-amp.  Any ideas where to

find one? [ Newbury Rally next week ]

 
Hi.
 
The G3YXM / G0MRF pre-amp is fairly narrow. It certainly offers good rejection of MW.
But it is 50 ohms ish in and out.  - I think some simple response tests are listed on the web site.
 
Another possibility would be a tuned input FET which could be made a higher Z input.
 
73
 
David  G0MRF
 
www.g0mrf.freeserve.co.uk

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