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Dennis,
Don't worry about operation on vlf, I think
you find the band acts more like top band , with a well defined service area
~60/ 70 miles and a first skip round 200/250 , I can see a trace at Birmingham
with 500mW to my antenna , only real problem is the dreaded deep fade 'qsb' whic
takes the signal out 30 seconds up to 1 minuet + , which causes havoc with
rtty , as you have no idea if the other station copied anything .... dont
suppose you have amtor ?
I doubt you will cause any interference
with those power levels , I ran 20 watts to a inverted L 40 ft
x 40 ft for a long time , which radiated quite well , but after adding a top
loading coil found it worked a lot better , with 150 watts and a new variometer
tuner , still didn't record any problems ..
Had more problems with the pc jamming the incoming
signals and a funny long life bulb that radiated a well spaced spectrum across
the band ! check out the pages on the google uk500khz web news group
for links to the grabbers etc .
73 's
Graham ..
G0NBD
Sent: Thursday, July 31, 2008 9:52 AM
Subject: LF: Re: 500KHz NoV
Hi Lee
I have just got my NOV to operate on 500kHz, so
will be dipping my toe into the water from next week.
I have not got any 138kHz experience and only
obtained my full amateur licence last May.
On my application for the NOV, I provided a
scale diagram of my own and immediate neighbour's properties, gave a brief
description of the TX(home brew), RX(Lowe HF-225) and antenna(T) that I
intend to use and an estimate of my erp from the TANTENNA program on the
internet (200mW). As I am using a VFO, I use a counter to measure the
frequency and also monitor transmissions using the RX which has a digital
readout. I also stated that I would cease transmissions until any
complaint was satisfactorily resolverd, and mentioned two nearby amateurs also
working on 500kHz whose help and advice I could seek.
All the above seemed to work, so good luck on your
application. The more the merrier.
73 Dennis M0JXM
----- Original Message -----
Sent: Tuesday, July 29, 2008 5:50
PM
Subject: LF: 500KHz NoV
Hi All,
After reading through loads of
stuff and monitoring the LF Group I?m left with the decision of whether to
start on 136 or 500KHz.
500KHz seems much easier to deal
with from the outset, and hopefully the NoV period will be extended further
next year.
However the NoV itself is the
possible stumbling block in that it appears that experience on 136KHz is a big
plus that Ofcom appear to be looking for,
My question is, would I get away
with applying for a NoV without first being active on 136KHz, or has anyone
already taken this route and been successful?
73,
Lee M0LMH.
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