Date   

Re: smb plug?

groupio@...
 

Hi Dave,

I know the feeling. I have just modified a Nokia PA for 437MHz DATV. Basically it was a matter of supplying 28v to the right pins and 12v to switch it on. A couple of 'links' to enable things and away it went. I think this will be similar but have not done it yet. The mods for the SMA connections suddenly came in a lightbulb moment, i am still waiting for the next one. I will take some more photos when I modify it.

437MHz conversion:
http://g8lce.com/forum/viewtopic.php?f=11&t=18

Martin - G8LCE


Re: smb plug?

Dave Cawley G4IUG
 


Hi Martin
 
Were you able to find modification details on that PA ?  I've seen several iffy one ?
 
Thanks
 
Dave
 
G4IUG


Re: smb plug?

groupio@...
 

Here is my final conversion of the sockets/plugs. I used ordinary SMA printed circuit mounting sockets.



As for the multi way power connectors I am very tempted to cut the pins near the top of the underneath bits and turning over the bit cut off pluging it into the pins now left. Then soldering on the  power supply wires to the reverse side (now the top) of the connectors. This would mean you could unplug the power leads. Take a look at the connectors and see if you think that might work.
The other plan is to use some wires with pins on that come with prototyping pin boards that are sold for RPi experimenting etc. and then glueing the finish set of pins to form a plug.

Martin - G8LCE


Re: Dishes and wind

Pete - GM4BYF
 

If the wind blows the wrong way, this is what happens !!

Fortunately no damage to anybody or anything - except my pride!

See attached

73
Pete GM4BYF
On 16/01/20 10:00, Alan Beard wrote:

Taken on Ponape, Federated States of Melanesia 

What happens if the wind blows the wrong way???

Taken in 2010

Alan VK2ZIW

On Wed, 15 Jan 2020 10:24:03 +0000, alwyn.seeds1 wrote
> The same Husband & Co. that did the structural design for Jodrell Bank.
>

> Interesting description of the issues faced in [UTF-8?]Lovell’s book [UTF-8?]“The Story of Jodrell [UTF-8?]Bank�.
>

> Regards,
>

> Alwyn

>
> _____________________________________________________
>

> Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
> _____________________________________________________


---------------------------------------------------
Alan Beard

OpenWebMail 2.53


--
vry 73
Pete GM4BYF


Re: Ungar

Bob Lockley VK6KW
 

Hi Gordon,

See pages 4 & 5 9911AS/H…

https://www.audiolabga.com/pdf/UNGAR.pdf

 

Hope this helps,

73,

Bob.

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Gordon REASON via Groups.Io
Sent: Thursday, January 16, 2020 9:19 PM
To: banburyars_g0bra@...; UKMicrowaves@groups.io
Subject: [UKMicrowaves] Ungar

 

I have a working Ungar 9900 soldering station , but no iron , no longer made .........

Using various loads instead of a 24 volt iron element , it appears to be good .

Does anyone perhaps have any info , on an Ungar 9911 , or similar , soldering iron ....I need to know what type thermocouple it used .


Ungar

Gordon REASON
 

I have a working Ungar 9900 soldering station , but no iron , no longer made .........

Using various loads instead of a 24 volt iron element , it appears to be good .

Does anyone perhaps have any info , on an Ungar 9911 , or similar , soldering iron ....I need to know what type thermocouple it used .


Re: 3cm personal beacon frequencies

Andy G4JNT
 

Depends if you want to run "unattended" or not



On Thu, 16 Jan 2020 at 10:17, geoffrey pike via Groups.Io <gi0gdp=yahoo.co.uk@groups.io> wrote:
Just looked at the RadCom RSGB band plan and so are personal beacons in:-
10,400-10,475 MHz
or under local beacons:-
10,368.750 to 800 MHz

cheers
Geoff
GI0GDP


3cm personal beacon frequencies

geoffrey pike
 

Just looked at the RadCom RSGB band plan and so are personal beacons in:-
10,400-10,475 MHz
or under local beacons:-
10,368.750 to 800 MHz

cheers
Geoff
GI0GDP


Re: Dishes and wind

Alan Beard
 

Taken on Ponape, Federated States of Melanesia 

What happens if the wind blows the wrong way???

Taken in 2010

Alan VK2ZIW

On Wed, 15 Jan 2020 10:24:03 +0000, alwyn.seeds1 wrote
> The same Husband & Co. that did the structural design for Jodrell Bank.
>

> Interesting description of the issues faced in [UTF-8?]Lovell’s book [UTF-8?]“The Story of Jodrell [UTF-8?]Bank�.
>

> Regards,
>

> Alwyn

>
> _____________________________________________________
>

> Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
> _____________________________________________________


---------------------------------------------------
Alan Beard

OpenWebMail 2.53


WTB: HP 5086-7781 YIG module

Conrad, PA5Y
 

I don´t suppose any one has for sale or can repair a HP 5086-7781 YIG for my HP-8562A? I have left it to one side for long enough, its time that I fixed it.

 

73

 

Conrad PA5Y


Re: Dishes and wind

alwyn.seeds1
 

The same Husband & Co. that did the structural design for Jodrell Bank.

Interesting description of the issues faced in Lovell’s book “The Story of Jodrell Bank”.

Regards,

Alwyn
_____________________________________________________

Alwyn Seeds, Director
SynOptika Ltd.,
114 Beaufort Street,
London,
SW3 6BU,
England.


SynOptika Ltd., Registered in England and Wales: No. 04606737
Registered Office: 114 Beaufort Street, London, SW3 6BU, United Kingdom.
_____________________________________________________


Re: Dishes and wind

Paul Randall G3NJV
 

The original 1960’s Telstar 85ft antenna (Goonhilly 1) stowed on the horizon with “back to wind”. On the other hand, the 32 meter KU band Mitsubishi Goonhilly 5 stowed at zenith - which turned out to be the most common position for all the big antenna. Some small cheap <15m antenna did not have full motion so could not be stowed.

Although 100 mph wind gusts were common on the extremely exposed Goonhilly Downs site on the Lizard peninsular in Cornwall, no dish was ever taken from service and stowed. However, it was interesting to watch the active tracking equipment trying to keep pointing errors to a minimum whilst the control building shook in the wind. A lot of the “tracking error” that was being corrected was of course caused by flexing of the steel structures.

 

I recall one major “off track” event on Goonhilly 2 (now scrapped) that was later attributed to one of the railway-track type “bogies” lifting clear from its track under wind pressure.

 

My brother managed to slightly bend a steel girder on Goonhilly 1 by trying to move it with the stow lock still engaged. This original dish was based on a naval gun turret, designed by Husband & Co to track the first LEO comsat; it had to spin really fast in azimuth on near overhead passes! It had Ward-Leonard steering motors, something like 750HP. To put this in perspective, the later and larger 1970s Marconi Goonhilly 3 antenna had just 2HP steering motors with 20HP slew motors for fast repositioning.

 

Happy Daiz

Paul G3NJV

 

Sent from Mail for Windows 10

 


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of Tim <VK2XAX@...>
Sent: Tuesday, January 14, 2020 11:56:04 PM
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Dishes and wind
 

Hi Paul,

All the VK dishes I know of park like that. But then we don't have issues with snow either. You can see some of the DSN dishes in Tidbinbilla parked here...

https://www.cdscc.nasa.gov/Images/Gallery/aerial4_fs.jpg

And for the Parkes dish in particular, a quote from....

https://www.csiro.au/en/Research/Facilities/ATNF/Parkes-radio-telescope/About-Parkes

"Because the large surface of the dish catches the wind like a sail, the telescope must be 'stowed' (pointed directly up) when the wind speed exceeds 35 kilometres an hour."

regards

Tim

On 15/01/2020 2:02 am, Paul G8KFW wrote:

Hi Keith

 

I think that is how Parkes park theirs during high winds

 

Regards Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Keith
Sent: 14 January 2020 14:44
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dishes and wind

 

Living in the second windiest city on the planet after Chicago I park my dishes in the inverted umbrella position, feed pointing directly upwards.
Several years later and still no issues
Cheers 
Keith VK6KB / VK6EME Perth Western Australia.

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK
-- 
VK2XAX : QF56if : ITU59 : CQ30 : BMARC : WIA


Re: Dishes and wind

Paul G8KFW
 

Hi Tim

 

The first picture you say from the gallery of aerial 4 but can you come back with the actual site

 

OK about the snow  that is how you achieved a first at 122 Ghz with reduced water vapour  at the moment in parts of the UK it is 100 % water

 

Regarding Parkes telescope and the film 'The Dish' I think there was a bit of licence  apparently the pictures coming from Parkes during Apollo 11 where better than the other station hence it was the major receiving station for Apollo 11 and gained extra work due to its better reception from space and is a credit to Australia the designers and those that built it

 

I think you will find the Parkes telescope has actually not always been stowed at winds above 35 kilometres an hour as during the Apollo 11 mission

 

any way best of luck with the samples for the 122 GHz project certainly cracked you first wish to go for 50 sets of equipment  nearly 10 times that now

 

Best Regards Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Tim
Sent: 14 January 2020 23:56
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dishes and wind

 

Hi Paul,

All the VK dishes I know of park like that. But then we don't have issues with snow either. You can see some of the DSN dishes in Tidbinbilla parked here...

https://www.cdscc.nasa.gov/Images/Gallery/aerial4_fs.jpg

And for the Parkes dish in particular, a quote from....

https://www.csiro.au/en/Research/Facilities/ATNF/Parkes-radio-telescope/About-Parkes

"Because the large surface of the dish catches the wind like a sail, the telescope must be 'stowed' (pointed directly up) when the wind speed exceeds 35 kilometres an hour."

regards

Tim

On 15/01/2020 2:02 am, Paul G8KFW wrote:

Hi Keith

 

I think that is how Parkes park theirs during high winds

 

Regards Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Keith
Sent: 14 January 2020 14:44
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dishes and wind

 

Living in the second windiest city on the planet after Chicago I park my dishes in the inverted umbrella position, feed pointing directly upwards.
Several years later and still no issues
Cheers 
Keith VK6KB / VK6EME Perth Western Australia.

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK

-- 
VK2XAX : QF56if : ITU59 : CQ30 : BMARC : WIA

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK


Re: Dishes and wind

Tim, VK2XAX
 

Hi Paul,

All the VK dishes I know of park like that. But then we don't have issues with snow either. You can see some of the DSN dishes in Tidbinbilla parked here...

https://www.cdscc.nasa.gov/Images/Gallery/aerial4_fs.jpg

And for the Parkes dish in particular, a quote from....

https://www.csiro.au/en/Research/Facilities/ATNF/Parkes-radio-telescope/About-Parkes

"Because the large surface of the dish catches the wind like a sail, the telescope must be 'stowed' (pointed directly up) when the wind speed exceeds 35 kilometres an hour."

regards

Tim

On 15/01/2020 2:02 am, Paul G8KFW wrote:

Hi Keith

 

I think that is how Parkes park theirs during high winds

 

Regards Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Keith
Sent: 14 January 2020 14:44
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dishes and wind

 

Living in the second windiest city on the planet after Chicago I park my dishes in the inverted umbrella position, feed pointing directly upwards.
Several years later and still no issues
Cheers 
Keith VK6KB / VK6EME Perth Western Australia.

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK
-- 
VK2XAX : QF56if : ITU59 : CQ30 : BMARC : WIA


Input for DUBUS 1/20

John Quarmby
 

I will be writing my piece for the Microwave Europe section of DUBUS 1/2020 shortly. I would be pleased to receive reports of DX contacts made on 1.3GHz and up during the recent good tropo over the new year, plus any other reports on meetings or other activity. Pictures are always very welcome of course.

Please send them to my usual address g3xdy@...

73

John G3XDY


Re: Dishes and wind

g4cch_1
 

My 5.4m EME dish is parked at almost 90deg elevation. The counterweight arms on the back of the dish are strapped to the tower to reduce the twisting motion on the azimuth shaft.

If wind is forecast for any length of time over 40mph, then I luff the dish over like this, and support/brace with scaffold tubes. The feed has to come off unfortunately to avoid rain getting in.


Re: Dishes and wind

Paul G8KFW
 

Hi Keith

 

I think that is how Parkes park theirs during high winds

 

Regards Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Keith
Sent: 14 January 2020 14:44
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dishes and wind

 

Living in the second windiest city on the planet after Chicago I park my dishes in the inverted umbrella position, feed pointing directly upwards.
Several years later and still no issues
Cheers 
Keith VK6KB / VK6EME Perth Western Australia.

No virus found in this message.
Checked by AVG - www.avg.com
Version: 2016.0.8048 / Virus Database: 4793/15886 - Release Date: 08/14/18
Internal Virus Database is out of date.


--
Paul Bicknell G8KFW   South Coast UK


Re: Dishes and wind

Keith
 

Living in the second windiest city on the planet after Chicago I park my dishes in the inverted umbrella position, feed pointing directly upwards.
Several years later and still no issues
Cheers 
Keith VK6KB / VK6EME Perth Western Australia.


Beginners GNU radio course Cardiff, March 8th 2020

John Worsnop
 

The second run of the highly successful GNU radio course is due to take place on March 8th at Cardiff University the day after the UK Microwave group round table.

Please would you email me direct for an application form and course details if you would like to attend

Course fee has not been finalised you but it will be in the region of £50- £60, and include an RTL SDR dongle. There is no need to bring a computer as the University will provide a configured machine for use in the course on the day. A download of all required software and notes will be available after the course to allow to to set up the software on your own machine at home.

73 John G4BAO


Re: Dishes and wind

Conrad, PA5Y
 

A long time ago when I did my dissertation at Uni I read a JPL paper that described mesh versus solid dish windload results from experiments in a wind tunnel. It was for scaled down model of BIG dishes.  The conclusion was that the turbulence above 50 mph around mesh wires makes the wind load of a mesh dish close to that of a solid dish at wind speeds approaching or above this. I don't remember the exact wind speed at which they became the same but it was certainly in the range we would typically see on an average British hilltop. I could not find the original paper, there was a very telling accompanying graph, I will find it if I can find my dissertation. Most likely it is in the UK.

This is quite interesting:


73

Conrad PA5Y









From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of John Lemay via Groups.Io <john@...>
Sent: 14 January 2020 12:19
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Dishes and wind
 
Firstly, many thanks for the helpful comments yesterday. I went with my gut feeling, and pointed the dishes downwind, and all was well. There's more to come later today, probably worse than yesterday here if the forecast is correct.

My larger dish (2m diameter) is home designed and home built, so I have plenty of interest in its survival !

Chris -

I've read the same web pages as you have by the sound of it, regarding wind loading of mesh dishes v solid dishes. And I'm not convinced. But it occurs to me that we should be considering not two types of construction, but three types. These are solid, perforated material, and mesh. If we compare solid and perforated material I can understand that the difference in wind load is not great; I'm looking at a sample sheet of perforated aluminium and the holes probably represent 30% of the area. But with mesh (like RF HamDesign dishes) the gaps represent 70 to 90% of the area, depending on the mesh option chosen.

Nothing is simple, is it ?

Regards

John G4ZTR


-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Chris Bartram G4DGU
Sent: 14 January 2020 10:50
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Dishes and wind

I've recently been working on the design of a new mast system and I want
it to support a reasonable dish for terrestrial operation. A lattice
tower wouldn't be appropriate here, and I need something a bit better
than a beefed-up domestic installation. I also need easy access to the
antennas. As I've never been particularly interested in 2.3, 3.4, and
5.6GHz, I plan to use a domestic 1 or 1.2m offset dish with an efficient
dual-band 1.3/10GHz feed. A snake yagi would be unlikely to survive for
very long here.

Living in Cornwall where it's intrinsically windy, at a location which
is also subject to katabatic winds falling off the range of hills on
which the GB3MCB beacons sit, I've been looking at the problems from
first principles. This seems to be an everyday problem on a par with
circuit analysis for structural engineers ... My initial reading of a
number of sources does seem to suggest that a worst case calculation of
the force developed by the wind on a dish antenna is something which
isn't that difficult to perform: the principles behind the building
regulations take into account the aerodynamics of the dish in arriving
at their figures.

One very relevant point - which I have seen made in amateur radio
publications, but which doesn't seem to be generally appreciated here -
is that mesh dishes aren't that much better in terms of wind loading
than than solid dishes of the same diameter at higher windspeeds. The
difference seems to equate to a small penalty in dish diameter and the
increased efficiency of the solid dish probably counteracts that.

I hope these comments are useful: I'll probably understand this a lot
better with further reading, so please treat them as provisional!

73

Chris

G4DGU