[UK-CONTEST] UK-Contest Digest, Vol 112, Issue 11

[GM4JR]

G1SMI

Yes, Bob's passing was a great shock to me. We always met half an hour
before the start of each UKAC (all 52 last year plus others!) for a wee chat
before the contest started in earnest. Bob featured as "001" in my logs in
over 40 of those 52 contests during 2011.

We last spoke on the phone a few days before he was taken to hospital.

A great loss, a very good friend, I'll miss him a lot.

RIP Bob - proud to have known you mate.

Andy

GM4JR



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Today's Topics:

   1. Re: [ukmicrowaves] Bob Waters G1SMI - Silent Key (Richard G4HGI)
   2. BERU 2012 Malta Story 9H3C (Bob G3PJT)
   3. Re: Portable generators (Steve Thompson)
   4. Re: Portable Generators.... (John Warburton G4IRN)


----------------------------------------------------------------------

Message: 1
Date: Fri, 6 Apr 2012 20:07:21 +0100 (BST)
From: Richard G4HGI <g4hgi at yahoo.com>
Subject: Re: [UK-CONTEST] [ukmicrowaves] Bob Waters G1SMI - Silent Key
To: "ukmicrowaves at yahoogroups.com" <ukmicrowaves at yahoogroups.com>
Cc: "uk-contest at contesting.com" <uk-contest at contesting.com>
Message-ID:
	<1333739241.38479.YahooMailNeo at web29502.mail.ird.yahoo.com>
Content-Type: text/plain; charset=utf-8

Hello Ray & All on The ukmicrowaves and uk-contest Reflectors

Bob was a cracking bloke and a top's V/U/SHF Operator

He was one of those who truly has been there done it and got the T Shirt

Just a note from all at Bolton Wireless Club 

He will be sadly missed by all particularly at our meetings

In 2011 he held the honour of taking part in every UKAC on 4 6 2 70 and 23
in the year

That's 52 contests !!? Now that's dedication :-)

Great stuff Bob

Cheers Richard G4HGI
B W C



________________________________
 From: gm4cxm <gm4cxm at yahoo.co.uk>
To: ukmicrowaves at yahoogroups.com
Sent: Friday, 6 April 2012, 17:09
Subject: [ukmicrowaves] Bob Waters G1SMI - Silent Key
 

? 

As noted on a few reflectors but not here yet, Bob G1SMI IO83PM passed away
on the 5th April at the Southport & Ormskirk Hospital.

Bob will be sorely missed on 23cm where it would be difficult to find a
month we never had a contact.
I have added our last contact to the files area for short period of time in
respect of Bob and the enthusiasm he presented.

RIP.

73 Ray GM4CXM


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------------------------------

Message: 2
Date: Fri, 06 Apr 2012 23:07:45 +0100
From: Bob G3PJT <g3pjt at btinternet.com>
Subject: [UK-CONTEST] BERU 2012 Malta Story 9H3C
To: UK Contest <uk-contest at contesting.com>
Message-ID: <4F7F6931.6090109 at btinternet.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Hi

Just put a few pics and story about Peter's, 9H3C, trip to GoZo on the 
BERU website under DXpeditions

73 Bob G3PJT


------------------------------

Message: 3
Date: Fri, 06 Apr 2012 23:23:56 +0100
From: Steve Thompson <g8gsq72 at gmail.com>
Subject: Re: [UK-CONTEST] Portable generators
To: uk-contest at contesting.com
Message-ID: <4F7F6CFC.9050006 at gmail.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

Not a great deal to tell, at least within the limits of a 
reflector posting, Dale. A lot of the incidental info. works 
better with a pen and paper for sketches.

It's very instructive to use a low voltage transformer to feed a 
'scope and look at the output waveform from a basic genny, with no 
load, resistive load and high power tx. It's rarely anything like 
a sine wave. Typically the field is fed with a munged version of 
the output voltage, so you get something that's sort of 
triangular, or sin^2ish at best. A capacitor input PSU usually 
puts a 'notch' in the rising edge of the waveform. You'll soon see 
why a 3kVA genny struggles to run a 400W amp.

We had a genny where the field supply circuit failed and 
replacements were a decade or more obsolete so we thought we'd 
experiment. From memory the field needed something like 35V off 
load and 47V at 2-3A at full load so we built a linear PSU style 
dc supply based on a 741 feeding a big darlington. The output was 
monitored from a low voltage transformer, rectified and fed into a 
RC network so the peak voltage was averaged over a few cycles to 
provide the feedback signal. Residual magnetisation made it self 
starting but it could be powered from a battery for start-up if 
needed.

Dive into the business end of the alternator - hopefully you'll 
find some slip rings supplying field current into the rotor. I'm 
told some building site gennys have the entire field system 
embedded within the rotor, in which case you're stuck with it. 
After that it's down to experimentation - you'll probably need 
lower voltage and current than our example, that was for 15kVA. 
Take care, and don't blame me if you end up making smoke rather 
than mains!

Steve

> Hi steve. Could you tell us more about supplying the field from
> an external source? This sounds like a really good fix.
> Incidently I made a high power linear a few years ago with a
> choke input filter in the EHT PSU which performed well on a
> genny so I agree withhg you, the main culprit is the capacitor
> input filter. Dale G3XBY



------------------------------

Message: 4
Date: Sat, 07 Apr 2012 08:27:29 +0100
From: John Warburton G4IRN <qrz at dxdx.co.uk>
Subject: Re: [UK-CONTEST] Portable Generators....
To: uk-contest at contesting.com
Message-ID: <4F7FEC61.20002 at dxdx.co.uk>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed

A few years ago I bought an SDMO inverter generator (something like the one
on this link:
http://www.amazon.co.uk/SDMO-Inverter-Neo-1000-0-9kW/dp/B003WE9S9U)

It was so electrically noisy when we tried it at NFD that I sent it back and
got my money refunded! We've since bought
a 'normal' generator and use it with a voltage regulator unit - we now have
no problems whatsoever.

So, be wary of the inverter types - if you can afford it, Honda seems the
way to go.

73 John G4IRN.



Slightly off topic but?I would be interested to hear what portable contest
stations are using in the way of generators and what equipment?it powers.
?
My club runs a single radio, Acom 1000 and a couple of laptops.
?
?
Regards,
?
Bob - 2E0KLO
?
rrushbrooke at yahoo.com



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