[Lowfer] First Impressions: AMRAD Converter and Lowpass Filter

[Douglas D. Williams]

Glad it's working well for you Ben. Todd advised me to be sure to use a
good quality jumper between the LPF and the converter. I use LMR-195 for
most of my receive jumpers.

On Mon, Feb 2, 2015 at 7:52 PM, Ben Hall <kd5byb at gmail.com> wrote:

> Evening all,
>
> Got the modified AMRAD converter / lowpass filter put together enough to
> give it a test run.
>
> I am *very* impressed.  With the KX3 as the receiver, I heard more
> aviation NDB's than I think I've ever heard before on any receiver. (Yes,
> the RBL and RBA are both pretty irritated over this.)  I could even hear
> some of the 474 kHz WSPR stations by ear.
>
> Only issue seems to be with the low-pass filter.  It works great up to
> about 512 kHz, then I get all sorts of currently unidentified stations
> centered at 530 kHz.  The worst right at 530 was a Spanish-language station
> - my Spanish was not good enough to identify the station.  As I tune up
> past 530, by the time I get to the low end of the AMBC all is quiet again.
> The local powerhouses, 730 and 770 are still audible, but way down.  No
> other AMBC stations were perceptable.
>
> I need to take the filter to the network analyzer at work.  I wonder if
> the 40 GHz network analyzer goes down to 500 kHz?  Hee hee.  ;)  We have
> some nice toys at work...and I don't get to play with them nearly enough!
>
> I need to make some more interface cables, figure out the lowpass
> problems, and I should have the combo on the air this weekend listening for
> y'all.
>
> thanks much and 73,
> ben, kd5byb
>
>
>
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