[RFI] Topband: Tecsun 660

[JW]

Good point, Courtland.
Most little HF receives like the Degen/Kaito 1103 series utilize "active antenna" technology (using a JFET as a buffer amp) in conjunction with the whipantenna, and the Degen 1103 bypasses the Hi-Z"active antenna" input circuitry when the externalantenna input is used via the dedicated ANT jack.
73,Jim WB5WPA
      From: Cortland Richmond <ka5s at earthlink.net>
 To: rfi at contesting.com 
 Sent: Monday, March 14, 2016 4:06 AM
 Subject: Re: [RFI] Topband: Tecsun 660
   
On 3/13/2016 1:52 PM, Jim Brown wrote:
> Not surprising -- the TH-F6A has pretty poor sensitivity below VHF. 
Jim,

It's been years since I tested mine – before it died – but as I recall, 
it was quite sensitive in the HF range – if you use a 50 ohm signal 
generator. A short whip is something like 10,000 ohms of impedance and 
not very much capture area so you'd expect poor performance with those.

Cheers,

Cortland KA5S
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