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
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Re: Sheffield microwave event
Ray <gm4cxm@...>
--- In ukmicrowaves@yahoogroups.com, G3at@... wrote:
for your effort in putting the event together.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
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Re: YIG oscillator
Arie Dogterom <pa0ez@...>
Yes have the manual. I therefore know where the problem resides.
toggle quoted messageShow quoted text
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
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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
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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
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Re: 1.2Ghz opperation...
Christopher Bartram <cbartram@...>
Hello Tony
So I might be able to put a low profile antenna outside. Would anyoneIn 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
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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: say a thousand feet or more. It can also be important if you have localobstructions - that is, within, say a couple of miles. Even then you may be ableto use the local obstruction as a reflector, although not so much on 23cmas on higher bands.horizon, and maybe that's where height become more important - or just acceptthat there may be some directions in which you can't work!"seeing the horizon" and antenna feeder losses - not important if you canplace your gear at masthead, 'cos there's then virtually no feeder loss oneither RX or TX.and do a "scan" of your topography out to, say 50km. That'll give you afair idea of what your takeoff will be like. Then plan from that!
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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
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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.
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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
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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
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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
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9cm 34W dual Ionica PA article now complete at g4bao.com
g4bao
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Re: 10GHz Amp Identification
pjm <pauljmarsh@...>
some one on here may recognise and be able to give some info.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.
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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 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
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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
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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, I saw some of the tests today and indeed they looked firstYes, what a brilliant idea. Thank you to those organising the 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> ------------------------------------------------------------------------------ This E-mail and any attachment(s) are strictly confidential and is intended solely for the addressee(s). If you are not the intended recipient please notify <postmaster(at)palaemon.co.uk> and the sender by return and permanently delete the message. You may not disclose, forward or copy this E-mail or any of its attachments to any third party without the prior consent of the sender. ------------------------------------------------------------------------------
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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 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 familyPeter 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
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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:
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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
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