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Dennis,
I'm in a state of flux at this end , having a
big move round ,,which has not gone to plan still operational on hf
, but all the mf kit is in boxes at the moment , I can take a look , on 500 ,
with low power you will be better sending very slow cw and checking on the
grabbers , you should show at Birmingham and later in the night at Shetland
... Shetland is a very strange place as there doesn't look to be any
background noise . ... apart from the wind that occasionally removes the
antenna ! Gary is also running a on line 'grabber' he's about 60 miles
north of Birmingham . you may shown there...
Oddly , a good earth looks to do more for the
signal than the Ae , any pipes rods ect in the ground , use individual
wires and bring them all back to the same earth point , its not
conductance that makes the difference is ground capacity , the more the better ,
wires under the top of the ae will add to the return path for the
current...
The top loading coil, 40 turns of 30
amp wire on a coke bottle , (others may of used a cider flagon ....
they know who they are) ... and i think Gary favours a centre one, made a
big improvement. Anything that increases the
current in the vertical section of the system , don't bother with long low
wires , these just radiate vertically upwards..
the annoying thing is the station now
works much better on top band and 80 mtrs as a result of the mod's embodied for
500... could of done them 15 years ago
Q how are you generating fsk ?
Good luck
Graham
Sent: Sunday, August 03, 2008 5:00 PM
Subject: Re: LF: Re: 500KHz NoV
Graham
Thanks for your e-mail and encouraging
remarks. I have made a couple of test transmissions, but no comments
so far. I am having to suspend ops for the present as my neighbour
is having a nearby tree felled and I have lowered my antenna just in
case.
73 Dennis M0JXM
----- Original Message -----
Sent: Friday, August 01, 2008 1:27
AM
Subject: Re: LF: Re: 500KHz NoV
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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