[Elecraft] KSYN3A and below 490 KHz?

[Edward R Cole]

Would not an external preamp designed for 100 KHz not improve 
sensitivity?  Many operators use small loop antennas with preamps on 
both 600m and LF.

73, Ed - KL7UW, WD2XSH/45
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Date: Wed, 18 Feb 2015 10:17:09 -0800
From: Wayne Burdick <n6kr at elecraft.com>
To: Harry Yingst <hlyingst at yahoo.com>
Cc: Elecraft Reflector <elecraft at mailman.qth.net>
Subject: Re: [Elecraft] KSYN3A and below 490 KHz?

====snipped
 > Is it possible to move the lower limit down (lower than 100 kHz) 
or is is a constraint of the HW?

The latter. Sensitivity gradually decreases as you do down in 
frequency, and you start hitting a practical lower limit for the 
receive chain.

The preamp is not useful below 500 kHz, and will actually introduce a 
loss when turned on, so it should be left off in this range.



73, Ed - KL7UW
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