[Elecraft] K3 VLF transverter?

[Fred Jensen]

Narrowband weak signal digital modes that can get some gain from 
source/channel coding will probably dominate LF operation if we in the 
US ever get a general allocation.  US utility companies run their PLC 
systems in that range and are, or at least act like they are, very 
worried about QRM.  Since they are SCADA systems for control of the 
power grid, and the FCC is sensitive to it, so any allocation is likely 
to have a fairly stringent ERP limit, and signals will be weak for sure.

I don't know how high an EFHW would have to be to be effective.  With 
the exception of high power coastal stations [huge rhombics/curtains], 
most LF TX antennas are vertical-ish.

I was kidding about the SSB. :-)  I just noticed the BW was 2.1 KHz 
which was the BW of the Collins mech filter for SSB.

I don't know what the market for a suitable transverter would be for 
Elecraft but my guess is ... not big.  What comes out the 8.125 MHz BNC 
IF connector when you transmit?

73,

Fred K6DGW
- Northern California Contest Club
- CU in the 2013 Cal QSO Party 5-6 Oct 2013
- www.cqp.org

On 11/30/2012 12:36 PM, KD7YZ Bob wrote:
>
> On Friday Jensen used a Straight-Key to send:
> -------------Original Comment-------
>
>> band.  An EFHW antenna is "only" 1.1km long. :-)
> I can do that here.
>
>>   2.1KHz would
>> accommodate one SSB signal?
>
> that's funny! I forgot that one .. but I was thinking really about JT9-1
> mode .. wsjtx from K1JT  ... nice and narrow
>