Date   

23cm and 13cm RSGB UK Activity Contest Reminder

Ray <gm4cxm@...>
 

The July event takes place this Tuesday 14th between 19.00z and 21.30z.

I will be qrv on 23cm: IO75TW
150w 4x44 + LNA

Talkback on KST and 144.175.

For those for whom an aircraft scatter contact is required, please get
my attention earlier rather than later as the number of flights reduce
as the evening progresses.

I will advise later if 13cm equipment will be available this month.

73 Ray GM4CXM


Re: Sheffield microwave event

Ray <gm4cxm@...>
 

--- In ukmicrowaves@yahoogroups.com, G3at@... wrote:

Peter

Just a quick note to say how much I enjoyed to-day and to thank you
for your
effort in putting the event together.

Looking forward to next year


73s

Simon
I echo Simon's comments....for both days and for all the you, Peter
G3PYB and members of the Sheffield Club did to make the weekend such a
smooth running success.
Well worth the long drive and lack of sleep!
73 Ray GM4CXM


Re: YIG oscillator

Arie Dogterom <pa0ez@...>
 

Yes have the manual. I therefore know where the problem resides.
Arie

On 13-7-2008 21:59:25, Paul Bicknell (paul@bicknells.f2s.com) wrote:
I have just started going through the alignment procedure on my recently
acquired Wiltron sweeper as its frequency is low over part of its rang. It
might be that your yig is ok but the driver electronics may require
alignment I assume you have the service manual .
Paul South Coast UK


----- Original Message -----
From: Arie Dogterom
To: ukmicrowaves@yahoogroups.com
Cc: pamicrowave@yahoogroups.com
Sent: Sunday, July 13, 2008 8:06 PM
Subject: [ukmicrowaves] YIG oscillator


Re: YIG oscillator

Paul G8KFW
 

I  have just started going through the alignment procedure on my recently acquired Wiltron sweeper as its frequency is low over part of its rang. It might be that your yig is ok but the driver electronics may require alignment I assume you have the service manual .
Paul South Coast UK
 
 

----- Original Message -----
Sent: Sunday, July 13, 2008 8:06 PM
Subject: [ukmicrowaves] YIG oscillator

L.S.,
The 2-8 GHz oscillator in my wiltron sweep generator is out of order. Its
output is over most of its range too low and even zero around 2,5 GHz and
rather low near 7,5 GHzx.
It is a yig controlled and yig filtered unit. The Avantek S080--1115.
I cannot find info about it. Has somebody tried to repair such a unit ( with
succes I hope) Or does one know where to buy such a unit for acceptable
costs?
73
Arie


YIG oscillator

Arie Dogterom <pa0ez@...>
 

L.S.,
The 2-8 GHz oscillator in my wiltron sweep generator is out of order. Its output is over most of its range too low and even zero around 2,5 GHz and rather low near 7,5 GHzx.
It is a yig controlled and yig filtered unit. The Avantek S080--1115.
I cannot find info about it. Has somebody tried to repair such a unit ( with succes I hope) Or does one know where to buy such a unit for acceptable costs?
73
Arie


Re: 1.2Ghz opperation...

Christopher Bartram <cbartram@...>
 

Hello Tony

So I might be able to put a low profile antenna outside. Would anyone
recomend a Wimo panel? They are about 140euros and claim a gain of
14db with a beam width of about 30degrees. Its lower profile than a
yagi so the neighbours and yl will be happy! Is there any compromise
to using a Panel antenna apart from a Yagi's gain can be much higher.
In Ireland, you're going to be on the very edge of European 23cm activity.
Even here in south-west Wales, a couple of hundred km further east, the bands
above 1GHz are hard going, and need good equipment. To make a reasonable
number of QSOs, except possibly in major openings, you need to have the best
equipment you can put together. The antenna is particularly crucial. An
antenna with only 14dB gain (I assume over an isotropic source) isn't going
to be enough and you'll find it very frustrating indeed! The extra visual
impact of say a 2.5 or 3m long, 20dBi yagi over the panel antenna isn't
likely to be a major factor, as it will look more like a television antenna.
The 6dB extra gain may not sound a lot, but it is! An awful lot of microwave
ssb/cw QSOs take place at S/N ratios of less than 6dB...

To partially quote the immortal Mrs Doyle: 'G'wan, g'wan, g'wan, g'wan' put-up
a proper antenna!

Vy 73

Chris
GW4DGU in IO71


Re: 1.2Ghz opperation...

Tony Gallagher <tony_g_ireland@...>
 

Ok,
So I might be able to put a low profile antenna outside. Would anyone
recomend a Wimo panel? They are about 140euros and claim a gain of
14db with a beam width of about 30degrees. Its lower profile than a
yagi so the neighbours and yl will be happy! Is there any compromise
to using a Panel antenna apart from a Yagi's gain can be much higher.

Tony




--- In ukmicrowaves@yahoogroups.com, mikeg3pfr@... wrote:


In a message dated 11/07/2008 20:12:45 GMT Standard Time,
tony_g_ireland@... writes:

Sorry if this is a silly question, but is height ASL
any advantage while working tropo?



Hi, Tony,

No it's not a silly question. It all depends!

Height can be important if you are above the tropo inversion layer,
say a
thousand feet or more. It can also be important if you have local
obstructions
- that is, within, say a couple of miles. Even then you may be able
to use
the local obstruction as a reflector, although not so much on 23cm
as on higher
bands.

Much more important is that the antenna can "see" the distant
horizon, and
maybe that's where height become more important - or just accept
that there may
be some directions in which you can't work!

Antenna height at a fixed location is always a compromise between
"seeing
the horizon" and antenna feeder losses - not important if you can
place your
gear at masthead, 'cos there's then virtually no feeder loss on
either RX or
TX.

Best advice, use 'JNT's Geog software (or other, if you have access)
and do
a "scan" of your topography out to, say 50km. That'll give you a
fair idea of
what your takeoff will be like. Then plan from that!

Regards, Mike, G3PFR


Sheffield microwave event

G3at@...
 

Peter
 
Just a quick note to say how much I enjoyed to-day and to thank you for your effort in putting the event together.
 
Looking forward to next year
 
 
73s
 
Simon
 


Connections to NEOSID Helical Filters

D&R Friend <friends@...>
 

Greetings to all.

Can anyone please tell me if the pin connection diagrams of NEOSID double helical filters (matched to 50 ohms) that are visible at:

http://www.neosid.de/UK_Site/Filter_UK.htm

are drawn as though you are looking at the top of the can (like you would be designing the bottom layer of a PCB, 'x-ray' style), or whether they are drawn looking directly at the pins.

With a two helix filter, when there are two connection pins at each end of the can, one pin at each end is intended to be at RF ground and the other is a 50 ohm tap. It seems to me to be significant to get this point right.....if the pin that was intended to be the 'tap' was inadvertently connected to 'ground', you might still be able to couple RF into the resonator, but the tuning range would not be right.

From my reading of Neosid's diagrams, the way you look at it is not stated. Perhaps someone on this list has 'been there before' and knows for sure.

Thanks in anticipation,

Doug Friend, VK4OE,
Brisbane, Australia.


last post

Mark GM4ISM <gm4ism@...>
 

Apologies John and all
my last post was supposed  to be off list.
Great article John, abt time I got my hacksaw out again
Mark GM4ISM


Re: 9cm 34W dual Ionica PA article now complete at g4bao.com

Mark GM4ISM <gm4ism@...>
 

Hi John
Just noticed that I had already put an alt text on the image, so that on mouseover it told you to link the sense to supply..
Anyway, I have tweaked the image so your link will show what the alt text said on my site!
 
Added a bit of text re-enforcing this  message too!  + link to your project
 
great stuff.. hope to work u on 9cm one day!
Mark
GM4ISM

----- Original Message -----
From: g4bao
Sent: Saturday, July 12, 2008 12:48 PM
Subject: [ukmicrowaves] 9cm 34W dual Ionica PA article now complete at g4bao.com

Link to

www.g4bao.com

Any further questions please email me off reflector

73
John

No virus found in this incoming message.
Checked by AVG - http://www.avg.com
Version: 8.0.138 / Virus Database: 270.4.8/1547 - Release Date: 7/11/2008 6:05 PM


Re: HP431C Manual

Joe McElvenney <ximac@...>
 

Hi,

Thank you all for pointing me at the various sites with HP431
manuals. Much appreciated.


Cheers - Joe G3LLV


9cm 34W dual Ionica PA article now complete at g4bao.com

g4bao
 

Link to

www.g4bao.com

Any further questions please email me off reflector

73
John


Re: 10GHz Amp Identification

pjm <pauljmarsh@...>
 

some one on here may recognise and be able to give some info.

http://www.sydneystormcity.com/IMGP2618.JPG
Morning Dave,

The top one is a W5LUA / WA5VJB 10GHz LNA. I'm pretty sure that Kent
WA5VJB is on this list, probably worth emailing him for the info.

regards,

Paul M0EYT.


Re: 1.2Ghz opperation...

mikeg3pfr@...
 

In a message dated 11/07/2008 20:12:45 GMT Standard Time, tony_g_ireland@... writes:
Sorry if this is a silly question, but is height ASL
any advantage while working tropo?
Hi, Tony,
 
No it's not a silly question. It all depends! 
 
Height can be important if you are above the tropo inversion layer, say a thousand feet or more. It can also be important if you have local obstructions - that is, within, say a couple of miles. Even then you may be able to use the local obstruction as a reflector, although not so much on 23cm as on higher bands.
 
Much more important is that the antenna can "see" the distant horizon, and maybe that's where height become more important - or just accept that there may be some directions in which you can't work!
 
Antenna height at a fixed location is always a compromise between "seeing the horizon" and antenna feeder losses - not important if you can place your gear at masthead, 'cos there's then virtually no feeder loss on either RX or TX.
 
Best advice, use 'JNT's Geog software (or other, if you have access) and do a "scan" of your topography out to, say 50km. That'll give you a fair idea of what your takeoff will be like. Then plan from that!
 
Regards, Mike, G3PFR
 
 
 
 


10GHz Amp Identification

Dave Nelson <davenn@...>
 

Hi gang,
Picked up some 10 gig gear from an estate a few weeks ago.
Unfortunately, although the Amateur was a wonderful constructor (very tidy),
there were no notes made on any of his many projects.

here is a couple of GaAsFET preampboards in 2 of his projects that
some one on here may recognise and be able to give some info.

http://www.sydneystormcity.com/IMGP2618.JPG
and
http://www.sydneystormcity.com/IMGP2620.JPG

IMPG2618.jpg is a RX preamp
IMPG2620.jpg there are a pair of these in a transverter project. One is a RX preamp and the other is used as a TX amplifier ( I have no idea what output
is capable from these devices in TX mode)

Maybe some one recognises the PCB designs. Maybe they were purchased as
kits from the UK or USA ???


Cheers
Dave Nelson
VK2TDN


Re: Watch the Sheffield Microwave Round Table on your PC this weekend...

Geoff Blake <geoff@...>
 

On Fri, 11 Jul 2008, Peter Day wrote:

Geoff Blake wrote..
Yes, what a brilliant idea. Thank you to those organising the
event and those for the TV. If this is successful perhaps more
could be "televised" like this.

Yes BATC hope to do more of this. However the Sheffield event is a
first and obviously will be the yardstick of future Outside Broadcasts :-)
The main reason that I was not able to attend is due to a family
event - what's so special about a 40th Wedding Anniversary anyway
- so I will not be able to watch it. Perhaps the experts will be
able to tell me, will the stream be stored for a later showing,
Perhaps, it may be able to record the "show" in full video to a
DVD for later distribution?
Peter G3PYB tells me that it will indeed be archived and eventually
available on the BATC website for anyone to look at at their leisure. We
tested the system today and got excellent pictures so hopefully it will
be OK over the weekend. Please be toterant and overlook any silly
errors that may creep in... the technology works but the people in the
broadcast may not always be on the ball!
Yes, I saw some of the tests today and indeed they looked first
class.

Thanks to all concerned. I am going to try and stream/store them
to a PC whilst out celibrating a wedding anniversary

TTYL

Geoff
--
Geoff Blake G8GNZ located near Chelmsford, Essex, U.K.
Please reply to: geoff(at)palaemon(dot)demon(dot)co(dot)uk
Using Linux on Intel & Linux or NetBSD on Sun Sparc platforms

Please avoid sending me Word or PowerPoint attachments.
See <http://www.gnu.org/philosophy/no-word-attachments.html>
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Re: Watch the Sheffield Microwave Round Table on your PC this weekend...

Peter Day <microwaves@...>
 

Geoff Blake wrote..
Yes, what a brilliant idea. Thank you to those organising the
event and those for the TV. If this is successful perhaps more
could be "televised" like this.

Yes BATC hope to do more of this. However the Sheffield event is a first and obviously will be the yardstick of future Outside Broadcasts :-)
The main reason that I was not able to attend is due to a family
event - what's so special about a 40th Wedding Anniversary anyway
- so I will not be able to watch it. Perhaps the experts will be
able to tell me, will the stream be stored for a later showing,
Perhaps, it may be able to record the "show" in full video to a
DVD for later distribution?
Peter G3PYB tells me that it will indeed be archived and eventually available on the BATC website for anyone to look at at their leisure. We tested the system today and got excellent pictures so hopefully it will be OK over the weekend. Please be toterant and overlook any silly errors that may creep in... the technology works but the people in the broadcast may not always be on the ball!


73 Peter G3PHO


Re: Trimble Palisade GPS Receivers @ Sheffield

Arie Dogterom <pa0ez@...>
 

Mark,
If there is a way to get it here, I am very interested to fit it in my VE2ZAZ system.
Arie

On 11-7-2008 22:56:22, ken ferguson (ken_ferguson@...) wrote:
> Hi Mark could we possibly aquire two if possible please though we cannot
> get down to sheffield to pick it up but maybe ray gm4cxm could arrange
> something from his end to me in cumbria ?.
> regards
> ken
>
>
>
>
>
> ========================================
> Message Received: Jul 10 2008, 07:00 PM
> From: "Mark GM4ISM"
> To: ukmicrowaves@...
> Cc:


Re: Trimble Palisade GPS Receivers @ Sheffield

ken ferguson <ken_ferguson@...>
 

Hi Mark could we possibly aquire two if possible please though we cannot get down to sheffield to pick it up but maybe ray gm4cxm could arrange something from his end to me in cumbria ?.

regards

ken




========================================
Message Received: Jul 10 2008, 07:00 PM
From: "Mark GM4ISM"
To: ukmicrowaves@...
Cc:
Subject: [ukmicrowaves] Trimble Palisade GPS Receivers @ Sheffield

This weekend the Scottish microwave beacon group are offering Trimble Palisade GPS  integrated receivers / antennas for £10 each.
no connectors or cables available, sorry. Stock is limited, but if there is sufficient demand, we may be able to send more
These are unused old stock, 10 have been tested today.
These will be available from Ray GM4CXM
Some details as to their use in frequency standards is available on my website www.dc2light.co.uk
They are low jitter, and highly suited to amateur frequency standards. The produce 1PPS , not 10KHz
Bare minimum installation needs only 4 twisted pare wires (12V Dc and 2 for differential (RS422 levels) 1PPS)
 Drop me an email if interested, and I will try to ensure enough are available (subject to space etc)
 
regards
mark GM4ISM