A preselector is necessary for any serious use of my Flex5K anywhere outside
of the ham bands below ~ 20Mhz, and it can and does help at times even above
that. The input impedance of the Rx section is rarely 50 ohms, even in the
ham bands in many cases.
73....Jordan VE6ZT
----- Original Message -----
From: "Robert Costa, KB6QXM" <[email protected]>
To: "Jeff Singer" <[email protected]>; <[email protected]>
Sent: Monday, January 14, 2013 11:52 AM
Subject: Re: [Flexradio] Heros VLF Converter
Jeff,
Don't you believe that the Heros pre-selector would be advantagous to SWL
listeners? Considering that there is no filtering on the Flex outside of
the ham bands, wouldn't the pre-selector help with selectivity issues on
the general coverage of the Flex?
73,
Robert
KB6QXM
"Ham Radio Open Conversation"
Yahoo group owner/moderator
----- Reply message -----
From: "Jeff Singer" <[email protected]>
To: <[email protected]>
Subject: [Flexradio] Heros VLF Converter
Date: Mon, Jan 14, 2013 10:37 am
Please folks, the Heros VLF converter is vastly more sophisticated than
the
lower priced units with limited filtering from Palomar (which I own) or
Jackson Harbor or the others. The Heros is very fairly priced.
Still, most of us will NOT benefit from the Heros unless we're in an area
of
very high RF density. My $89 Palomar works great with my 5000.
Here are details on the impressive Heros VLF converter:
http://herostechnology.co.uk/pdf/VLF_LF_Converter_brochure_web.pdf
Regarding the Heros preselector: that's another waste for almost all U.S.
hams. But maybe a nice addition if you live in rf-noisy downtown London.
Jeff K0OD
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