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From: "Dave G3WCB" <ganymede444@btopenworld.com>
To: <rsgb_lf_group@blacksheep.org>
Date: Fri, 18 May 2007 23:02:06 +0100
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Subject: LF: [500]  Re: G3XAQ on 502.0 KHz
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Hi, Alan.

Thanks for the first QSO. I've captured a 500 kb WAV file if that would be
useful. You seemed to get a bit weaker by the end of the QSO, but this band
seems to have deep, slow QSB most of the time anyway.

When you were calling CQ G3YMC called you, but you obviously couldn't copy
him.

Welcome to 500k!

73, Dave G3WCB IO91RM, Iver, nr Windsor (Slough, also, but we keep quiet
about that!)

-----Original Message-----
From: owner-rsgb_lf_group@blacksheep.org
[mailto:owner-rsgb_lf_group@blacksheep.org]On Behalf Of Alan Ibbetson
Sent: 18 May 2007 22:21
To: rsgb_lf_group@blacksheep.org
Subject: Re: LF: Re: G3XAQ on 502.0 KHz


Yes, Gary, I think it's me on the grabber at G3YXM. Do any of the
grabbers capture the actual audio so I can listen to my CW note?

72,

Alan

In message <008001c7998e$b3f608c0$34556a58@wgt01>, Gary - G4WGT
<g4wgt@tiscali.co.uk> writes
>Congratulations Alan,
>
>I can't see anything of you up here in Lancashire but there is a signal
>keeps showing on Dave's (G3YXM) 500 KHz grabber on 502.000 KHz, could
>it be you ?
>
>Go to :-
>
>http://www.wireless.org.uk/grab/
>
>73
>
>Gary - G4WGT - IO83qp
>
>http://myweb.tiscali.co.uk/wgtaylor/
>Web site updated 07/05/2007
>
>
>----- Original Message ----- From: "Alan Ibbetson"
><alan@g3xaq.demon.co.uk>
>To: <rsgb_lf_group@blacksheep.org>
>Sent: Friday, May 18, 2007 9:38 PM
>Subject: LF: G3XAQ on 502.0 KHz
>
>
>>I have today got my 500KHz station on the air. I am located near
>>Canterbury, locator JO01md. Here are some technical details.
>>
>> The aerial is an inverted-L with a 15m vertical and a 35m horizontal
>>section. This was originally my top band aerial. I have added a 1mH
>>end loading coil (460 turns of 0.5mm enamelled wire on a 38mm OD white
>>poly  waste pipe occupying 275mm of winding length). The loading coil
>>is 14.7m  from the far end. I trimmed the 14.7m for resonance at
>>502KHz because I  wanted a roughly resonant aerial to simplfy feeding,
>>but from the way the  resonance wanders about as the wind blows I'm
>>not convinced this was such  a great idea. Standard formulae suggest
>>this aerial has a radiation  resistance of almost exactly 1 ohm.
>>
>> The aerial is end fed against a reasonable earth system comprising a
>>20m x  20m mat of stock fencing with the sections crimped together. I
>>also have  about twenty 30m radials. On top band I can work east coast
>>US easily with  100W and I have worked VK and W6 with 400W. I was
>>quite surprised (well,  p****d off) to measure the return loss of the
>>aerial system at 502KHz as  22dB. This suggests the input resistance
>>is a little over 40 ohms, almost  all of which is earth loss
>>resistance! So much for my "killer" top band  earth mat.
>>
>> I am using a link-coupled series tuned ATU with a loaded Q of 7
>>placed at  the base of the aerial to get the SWR very close to 1:1.
>>The 2:1 SWR  bandwidth of the aerial system is less than 2 KHz (1KHz
>>either side of  resonance).
>>
>> I have built a QRP transmitter using an ECL82 triode pentode, as
>>popularised by G0UPL and others. Output is 4 watts. Cathode keying
>>with a  small choke and 0.5uF capacitor gives a clean 3msec rise and
>>fall on the  keying waveform, but the un-neutralised PA has a backwave
>>that is only  40dB down. I've added a "half wave" filter after the pi
>>tank in an effort  to avoid QRMing MW broadcast stations. Harmonics
>>are over 50dB down.
>>
>> The main HF station FT1000MP Mk5 seems just OK on 500KHz. Band noise
>>is S  1 in a 500Hz passband on the meter.
>>
>> The rig is crystal controlled on 502.0KHz, so you know where to find
>>me!  All I need now is some stations to work. "Can you hear me,
>>Mother?".
>> --
>> Cheers,
>>
>> Alan G3XAQ
>> alan@g3xaq.demon.co.uk
>>
>>
>>
>
>
>

--

Cheers,

Alan G3XAQ
alan@g3xaq.demon.co.uk