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LF: Re: [ 500]; Two GW's Testing...

To: <[email protected]>
Subject: LF: Re: [ 500]; Two GW's Testing...
From: "Gw3UEP" <[email protected]>
Date: Tue, 24 Jul 2007 10:29:44 +0100
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Reasons to be happy - it's sunny & no monsoon.
 
Dave,
Very interesting, tks for your precision observations.
Well spotted - but not c/heating.  Yes, there is quite a temp-swing in shack, also PA heatsink is VFO.
 
Do you have a high noise-level?
Surprised you didn't spot Mike who is usually stronger than me.
Pleased to be braking the E-W iron-curtain.
73, Rog
 
 
----- Original Message -----
From: Dave G3WCB
Sent: Monday, July 23, 2007 9:43 PM
Subject: LF: [ 500]; Two GW's Testing...

Rog, LF.
 
I've got a complete set of Argo grabs of the GW3UEP beacon covering the last 24 hrs. (34 MBs worth...too big to e-mail!)
 
1 The beacon is visible at this QTH for the complete 24h period, using Argo 3 sec/dot setting
 
2 Daytime levels seem weak but fairly constant, presumably ground-wave only propagation. Never strong enough to actually detect by ear.
 
3 The transition to night-time propagation commences as a series of fades with about a 5 - 10 minute cycle, starting at around 2200 utc
 
4 Signals then increase up to workable CW levels, maintaining good copy with slight QSB from 0030 until 0330utc
 
5 Signals fall to daytime levels fairly abruptly at around 0400 utc, and I think Rog's central heating kicks in around then, as the frequency goes for a little walk LF before settling down close to the 501.500 kHz nominal.
 
So, the best time to work to work GW - SE England seems to be between 0030 and 0330 utc, when presumably skywave propagation is the dominant mechanism....no surprises there, I guess. At this distance, it's probably a single E-region hop. By contrast, the longer path to GM4SLV is probably 3 hops or more.
 
It will be interesting to see if the daytime signal levels hold up when Middle England has dried out a bit!
 
If Mike GW4HXO is in beacon mode over the next few days, I'll try and look for him. Nothing seen so far.
 
73, Dave G3WCB IO91RM 
-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of Gw3UEP
Sent: 23 July 2007 06:35
To: [email protected]
Subject: LF: Re: [ 500]; Two GW's Testing...

Dave/Dave/Gary/Mike,
 
Many thanks for your mails & reports, just collected  - had an early night after hard labour on Sunday.
 
Mike/HXO, you're still the GLD of Wales - I'm just warming up the trees here!
 
FYI, since March have been QRP [6W from mini-Tx, via external LPF with 1dB insertion-loss, so 4.75W via 100m 1/2" buried coax to remote ATU].
 
Last Thursday I routed the PA dc feed from 12V to the 22V pre-regulator supply & mini-tx now running happily with 20W o/p, after adding 15kuF smoothing.
 
Then I removed the external -1dB LPF & still no sign of M/wave harmonics off-site; so +6dB overall increase.  I_ant now ~0.6A.
 
Tx is still running on ~501.5.
 
Tks for tests.
 
73, Rog.
 
Dave/WCB; FB on ur Mk1 - this one is mimosa yellow, currently SORN, hope to MOT it soon.
 
----- Original Message -----
From: Dave G3WCB
Sent: Sunday, July 22, 2007 10:16 PM
Subject: LF: [ 500]; Two GW's Testing...

Hi Rog, LF
 
Screengrab of GW3UEP at 2107 utc. Just strong enough to be audible in peaks of QSB. Lots of static this evening, but I think you signal is definitely stronger.
 
Still looking for GW4HXO...
 
BTW, I've got a Mk1, Conifer green with a yellow nose, swing-axles and all...
 
73, Dave G3WCB IO91RM

Hi Rog,

HXO -  RST 319 with QSB to 419 at times
UEP - Just visible on SpecLab

73

Gary - G4WGT - IO83qp

 'HXO 539 but flattened by a 599 G0MRF on top
'UEP 319

73 Dave G3YMC Bracknell IO91PJ
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