[Elecraft] KSYN3A and below 490 KHz?

[Wayne Burdick]

On Feb 18, 2015, at 10:10 AM, Harry Yingst via Elecraft <elecraft at mailman.qth.net> wrote:

> I ordered a pair of the KSYN3A boards because mainly I have an interest in below 500 kHz.
> I already have the KBPF3 General Coverage RX Bandpass boards installed in both my receivers.As I understand it I will need to use the RX & AUX antenna inputs.

Correct.


> 
> 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.


> Will there be a Mod to the KBPF3 to allow it to work better below 500 kHz? 

Probably not. It allows quite useful sensitivity down to 250 kHz, and even some utility at 100 kHz. But most operators are interested in the 600-meter band (472-479 kHz).

Wayne
N6KR