Hi,
I've got a pile of textbooks in pdf format and it would be lovely
to have them in a convenient form such as on an Amazon 'Kindle' or
perhaps the Sony equivalent. The question is, how well do these
things handle schematics, graphics or maths? What are they like to
use in general; as touchy-feely as a paperback?
Of course they are way over-priced but Christmas is only eight
months away. A time when I can buy myself a present without
feeling guilty should folks say, "That's nice. How much was it?".
"Two hundred quid! You must have more money than sense", - a
sentiment I can't generally argue with. The lack of sense, that
is, but not the surfeit of money part.
Cheers - Joe G3LLV

I have the following for sale which would be good additions to anyone thinking of portable operation. I will split but anyone who is prepared to meet to pick this stuff up is getting a bargain.

Tonna 55 ele for 23 cms - assembled used twice - 35
Tonna 35 ele for 13 cms - assembled used twice - 25
Tonna 9 element portable for 2m brand new - 55
Waeco PerfectPower DCDC20, 20 A, 12 volts 24 volts converter 30 - this allows 24V operation portable ( good for 13cms surplus PAs) and will charge both batteries when the engine is running - used twice 35
2 x maintenance free batteries used twice the whole system will run 3-400W in a contest type scenario - the batteries have been maintained and are 12 months old 25 each
Portable tripod type aluminium mast 6m with rotary guy ring and waterproof compass rose used twice 40

240 separate 200 for the lot and I'll throw in some coax and big butch DC leads and power pole connectors- collection only - we can meet up to 50 miles or so radius

Conrad



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Cheek!



Not sent from my PC!


On 30 Apr 2009, at 08:18, Conrad G0RUZ <conrad@g0ruz.com> wrote:

Ahhhhhh I did a Jewell of a Bartram!

Conrad

Conrad G0RUZ wrote:
Rich sorry for the delay due to work madness but I won't get the coupler posted until tomorrow. Really sorry about the delay but I am working away from home.

Conrad

G8ZHA wrote:

Conrad,

Has the Narda coupler gone yet?

NARDA 3045C-10 7-12.4 GHz -10dB directional coupler


Regards, Rich G8ZHA









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Rich sorry for the delay due to work madness but I won't get the coupler posted until tomorrow. Really sorry about the delay but I am working away from home.

Conrad

G8ZHA wrote:

Conrad,
Has the Narda coupler gone yet?
NARDA 3045C-10 7-12.4 GHz -10dB directional coupler
Regards, Rich G8ZHA

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Conrad,
Has the Narda coupler gone yet?
NARDA 3045C-10 7-12.4 GHz -10dB directional coupler
Regards, Rich G8ZHA

From: Alan Melia
Subject: [ukmicrowaves] Desynn sender??
To: ukmicrowaves@...
Date: Wednesday, April 29, 2009, 7:52 PM

Hi all I am on the "scounge" again. If you are under bus-pass holder age you
will be muttering what the h..... is a desynn. These were much used in WWII
and soon afterwards as sensors and where often part of position indicating
systems. I had a pair (sensor and indicator, acquired whilst I was at Uni
and never used, but I gave them away (I dont think the receipient used them
either !)

The Desynn is the DC version of the better known AC activated Selsyn which
is used in a lot of antenna rotators and indicators.. ....and uses multiple
phases to drive an indicator... ..often just called a "servo" because the
units are "motor generators" and beefy enough to drive as well as just
indicate.

The desynn sender is a circular wirewound (potentiometer like) track tapped
at the 120 degree points and activated by two wipers at 180 degrees apart on
the track, usually via a standard 1/4 inch (6.35mm for the youngsters)
spindle . A DC voltage (24 volts usually) is put across the wipers and the
signals at the taps are fed down three wires to three coils in the indicator
connected in star configuration which drive a pointer to repeat the position
and movement of the wiper-spindle on the sender. So you know exactly where
your 15inch guns are pointing before you gently squeeze the trigger ....er
was that Bismark ??

I have unearthed another indicator but would very much like to get another
sensor or sender unit. If you have one of these unusual things sitting
around lonely in you junk box I would be happy to put it to use, and allow
it to enjoy a happy and useful retirement (like me !!) I dont mind if you
dont have the long obsolete circular multiway connector that the
interconnection wires used to be fed through.

Alan G3NYK

Hi Peter
Don't let me put you off using Winter Hill if it is an appropriate site for you. I am only going to be there for about 3 hours anyway. I'm still not sure what I will be able to achieve with the gear I have and it may be a waste of a good site.
I have done more work on the system recently, but I'm not sure yet how well everything is working. I have finished the 18" dish feed and managed to align it with the help of John MW1FGQ. The dish does have more gain than the horn, probably 6 dB or so, which I guess is about what could be expected. I have also fitted a preamp, but I am not sure what the noise figure is or whether it is any better than the front end of the transverter. All I know is that it has lots of gain.
I still need to put a calibrated scale on the bearing so that I can accurately point the dish, but I will do that during the week.
Hope I can give you some points on Saturday.
regards
Bob
G8DTF