Re: LF: Decca 5501 mod, conditions, noise mitigation, 8970 et al;

[Warren Ziegler <wd2xgj@gmail.com>]

Hi Laurence,
Very interesting on all points!
Mal G3KEV took a Decca PA module out and used it with external tank circuits - no mods to the Decca. Plug the amp module back into the Decca chassis and Bob's your uncle your back on 137.
I will send you the info if Mal doesn't beat me to it!
73 K2ORS

73 K2ORS

On Mar 2, 2013 1:03 PM, "Laurence KL1 X" <hellozerohellozero@hotmail.com> wrote:

Decca 5501 mod -

I think I recall that the late G3AQC, maybe others  had a clever way of installing mods allowing it to be "switched"  between 137 and 500 - if anyone has any details Id like to hear or see them - with thanks.

Conditions -

Well - its been a very poor LF season up here to date - with only a couple of Eu openings, obviously my stars havent been aligned, or moreover the Coronal holes have been.  At least the nights are getting shorter

 - HF conditions are very poor too at this time. Still its good X country skiing weather and the Aurora are pretty.

VLF

If anyone wants to spark up on 8970Hz again from Eu Im looking at slow QRSS's and shoving the results out on the web site.

 The s/n noise is now vastly improved down there too using the E field L400B.

QRM

I spent yesterday after noon with our local power utility linesman tracking down a noise source(s) pulsing away at 9Khz prf from 50kHz to 5MHz - traced one to a house about 0.4 miles from here, and I have a second one with the same sort of signature which is proving more difficult to DF.  I havent approached the owners yet, but heck sitting outside the offenders house on the road in the car with the SDRIQ and another L400B magmount the pulses were stronger than local NDB and some MW broadcast signals and a huge amount being re radiated from the underground power lines - so you can imagine something fairly meaty shoving out this do doo, especially as I can hear the same signatures (but maybe not the same source) on overhead HT power lines some 5 miles away - Im guessing home automation, but it might be a wayward lighting switch or blender :-) . If your interested theres a visual capture of the interference source covering the MF band at

http://kl7uk.com/Screen7.png

or on WSPR water fall   http://kl7uk.com/MEA1.png


Cheers





Laurence KL 1 X  WE2 XPQ