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Re: LF: Re: 500KHz NoV

To: <[email protected]>
Subject: Re: LF: Re: 500KHz NoV
From: "mal hamilton" <[email protected]>
Date: Tue, 5 Aug 2008 18:48:41 +0100
References: <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]> <[email protected]>
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Rhetoric bad, Antenna arena worse, CW ?
Considering today's pass marks at University is 30% is it any wonder the appliance operator lacks ability to comprehend what is really going on.
Since the radio amateur examination has been reduced to a tick test(multiple choice) everyone is in with a chance, guess work, result an appliance operator.
This is not only my opinion but lots of others, to whom I have spoken.
An  earth spike is better than an ANTENNA !!!!!!!!!!!!!
I have not heard any signals from from the EARTH man.
If possible get a 1/4 wave antenna installed at a good height otherwise expect poor results on MF. A match stick is a poor performer.
G3KEV
 
 
----- Original Message -----
From: Graham
Sent: Tuesday, August 05, 2008 1:41 AM
Subject: Re: LF: Re: 500KHz NoV

Contrary to  Mesolithic  belief the earth?ing  arrangement for a modern compact array  is actually quite important , as the coupling to  the earths magnetoshphere is far better and most efficiently accomplished by a correctly loaded and properly proportioned perpendicularly erect mono pole, than that achievable, but a some what longer flaccid and regrettable lower  sagging  element stretched possibly beyond its elastic limit wallowing in an obscenely high ground capacity.

 

Such pompous arrays when modelled with the appliance of science , reveal the ugly and un slightly truth that there entire efforts are directed skywards simply ensuring as in the proverbial , discharge to  windward ,  ensuring you simply get your own back .

 

The far more efficient and elegantly modelled short loaded vertical on the other hand , can be demonstrated to  meet the more modern criteria of . ?its not what you have its what you do  with it that count?s?  a most modern and elegant  stance.


Sent: Monday, August 04, 2008 6:35 PM
Subject: Re: LF: Re: 500KHz NoV

If an Earth spike does more for a signal than an Antenna you have a serious problem. The Earth spike is really the Antenna and the so called antenna is just by the way
G3KEV
----- Original Message -----
From: Graham
Sent: Sunday, August 03, 2008 7:43 PM
Subject: Re: LF: Re: 500KHz NoV

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 -----
From: Graham
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 -----
From: Lee Hudson
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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