Date   

Re: 10GHz Horn.

KENT BRITAIN
 

Will work fine on the 3cm band.   Kent WA5VJB/G8EMY



On Saturday, August 22, 2020, 8:23:57 AM CDT, Colin Ranson <g8lbs@...> wrote:


Being a newcomer to uW’s and quite ignorant to some of the stuff posted on here can anyone tell me if this ‘feed’ is useful and worth working on ?  Picked it up at a rally for a few bob, not sure what it’s called’  its ‘mouth’ measures 80mm across, its already bored for 22mm copper pipe and the mounting circumference is 40mm.

It is not beyond my capability to turn the 22mm pipe into an SMA feed.

 

 

 

 

 

 

 

Please excuse the date time stamp, old camera, not a lot of good.  Any suggestions welcome, including ‘bin’ it !

 

Best regards

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 

 


10GHz Horn.

Colin Ranson
 

Being a newcomer to uW’s and quite ignorant to some of the stuff posted on here can anyone tell me if this ‘feed’ is useful and worth working on ?  Picked it up at a rally for a few bob, not sure what it’s called’  its ‘mouth’ measures 80mm across, its already bored for 22mm copper pipe and the mounting circumference is 40mm.

It is not beyond my capability to turn the 22mm pipe into an SMA feed.

 

 

 

 

 

 

 

Please excuse the date time stamp, old camera, not a lot of good.  Any suggestions welcome, including ‘bin’ it !

 

Best regards

 

Colin de G8LBS

 

Sent from Mail for Windows 10

 

 


Re: Aerial facilities 1800 mhz GSM amplifier information.

Andy GD1MIP
 

Wilko,  thanks for replying.  I actually don't know what their official name or use was.
The above link shows pictures of the identity plates and inside.

Either way they are a great source of parts.

Andy GD1MIP 


Kuhne TR 144 40+ (OT)

Martin Cranage, G8OFA
 

Off topic I know but with such a body of expertise I thought I would ask here. My Kuhne 2m transverter that has served me well for at least 7 years has gone noisy on receive. With a good dummy load plugged in I am hearing instability evidenced by crackles and pops. Wonder if anybody has experienced this. It still receives signals reasonably well but is down on my IC-9700 by a few dB. 
--
Martin, G8OFA


Re: Aerial facilities 1800 mhz GSM amplifier information.

Wilko
 

hi Andy,

Are you referring to AFL PA or to their rx amps? I have 2 of the latter. They are 1 antenna to 4 rx distrib amps. Docs I have found to be unobtainium. Managed to figure out PSU connections (subD9 conn on mine). They work OK on 23cm. Have not tried anything higher freq.

Wilko
PA1WBU


Re: Torque Wrench for SMA

alwyn.seeds1
 

Dear All,

And while we’re at it note that the torque settings for brass SMA’s are 40% less than for the stainless steel ones.

Also, the setting for metrology is less than that used on assemble and forget applications.

I see the main use of SMA torque wrenches to be preventing over-tightening by the inexperienced/over enthusiastic.

By contrast, you need to be quite muscular to tighten a 7/16 connector to recommended torque- I hate the way this connector gives nasty suck-outs unless fully tightened.

Regards,

Alwyn G8DOH
  
_____________________________________________________

Alwyn Seeds, Director
114 Beaufort Street (Management) Company Ltd.,
114 Beaufort Street,
London,
SW3 6BU

114 Beaufort Street (Management) Company Ltd., Registered in England and Wales: No. 02797775 Registered Office Address: 114 Beaufort Street, London, SW3 6BU
______________________________________________________


Re: Dish for 122GHz?

Robin Szemeti - G1YFG
 

I thought it might be, but was worth asking.  They looked like "military quality" dishes, so I had some hope that they would be more accurate than some of the other stuff and be useful for the mm wave stuff, but I have no intention of trying complicated Cassegrain feeds to make the useful!  Pity really, as they are a bit small for 3cm ...

On Sat, 22 Aug 2020 at 00:08, Iain Crawford <iain@...> wrote:
You will need the f/d to be around 0.5 for the TRX_120_001.
0.25 is too deep.


--
Robin Szemeti - G1YFG


Re: Torque Wrench for SMA

dbztuzujdhgtrjzthxh
 

Hi Dave, the technique is sound.
I was describing how easy it can be using household items already on hand that will produce a level of precision better than most of us work at.

If you want a more accurate number, by all means treat the handle as a UDL (uniformly distributed load), you can buy precision weights and you can include the weight of the string.

Alternatively, you can drop it off at a meteorology lab and get it back with a certificate

As the OP wanted a confidence check, this technique is more than capable providing what was asked for.


Re: Dish for 122GHz?

Iain Crawford
 

You will need the f/d to be around 0.5 for the TRX_120_001.
0.25 is too deep.


Re: 2 photos uploaded

Andy GD1MIP
 

Chris. 

This thread deals with them.  They're part of some Aerial Facilities phone amps. 

https://groups.io/g/UKMicrowaves/topic/aerial_facilities_1800_mhz/27514059?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,27514059

Andy GD1MIP 


Re: Dish for 122GHz?

Robin Szemeti - G1YFG
 

Sorry, it would have helped if I had attached the URL ...


On Fri, 21 Aug 2020 at 17:56, Robin Szemeti - G1YFG via groups.io <robin=redpoint.org.uk@groups.io> wrote:

These were mentioned in another group,   focal length is about 60mm, depth about the same, putting the f/d at around 0.25

I was wondering about one to use with a VK5KK  122GHz board, ( I am quietly hoping they are not too far away now ...)  mounted at the focus.  Thoughts?   Is an F/D of 0.25 a bit deep for the naked TRX_120_001?



--
Best regards,

Robin Szemeti

Redpoint Consulting Limited

E: robin@...
T: +44 (0) 1299 405028
M: +44 (0) 7971 883371

CONFIDENTIALITY NOTICE
The information contained in this e-mail is intended only for the
confidential use of the above named recipient. If you are not the
intended recipient or person responsible for delivering it to the
intended recipient, you have received this communication in error
and must not distribute or copy it.
Please accept the sender's apologies, notify the sender immediately
by return e-mail and delete this communication.

Thank you.

--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG


Dish for 122GHz?

Robin Szemeti - G1YFG
 


These were mentioned in another group,   focal length is about 60mm, depth about the same, putting the f/d at around 0.25

I was wondering about one to use with a VK5KK  122GHz board, ( I am quietly hoping they are not too far away now ...)  mounted at the focus.  Thoughts?   Is an F/D of 0.25 a bit deep for the naked TRX_120_001?



--
Best regards,

Robin Szemeti

Redpoint Consulting Limited

E: robin@...
T: +44 (0) 1299 405028
M: +44 (0) 7971 883371

CONFIDENTIALITY NOTICE
The information contained in this e-mail is intended only for the
confidential use of the above named recipient. If you are not the
intended recipient or person responsible for delivering it to the
intended recipient, you have received this communication in error
and must not distribute or copy it.
Please accept the sender's apologies, notify the sender immediately
by return e-mail and delete this communication.

Thank you.

--
Robin Szemeti - G1YFG


Re: FRANCO 12ghz to 24ghz doubler

Barry Chambers
 

Neil

I missed some photos of T2 - attached - still searching for last one!

73 Barry, G8AGN

On 21/08/2020 12:27, Neil Smith G4DBN wrote:

I can vouch for Andy's code working with my ADF5355s.  Saved me scrambling up the nursery slopes of the learning curve unaided.  I hacked it about for my own nefarious purposes of course, but 'tis a marvellous thing to have someone ploughing the furrow and showing how to make it work. Huge thanks as usual for the very useful resources.

Just one thing to consider before going for JT4 on the higher microwave bands.  I cannot get decodes from weak troposcatter signals on 10 GHz from GB3PKT or GB3OSW even when the signal is loud enough to HEAR, never mind see on a waterfall. I reckon that with these very long integration times, I can see signals at least 10 dB lower than those needed to get JT4 decodes.  The scintillation at 3 cm has components of amplitude variation close enough to the symbol rate to remove some symbols completely, often enough to wreck and chance of a decode.

I watched OSW for 30 minutes last night and I could see faint smears of troposcatter from the plain tone segments when I integrated for > 5 seconds per pixel that would have allowed *visual* decoding of DFCW or QRSS at perhaps 10 seconds per symbol, but it was way too weak, chopped up and spread out for any hope of detection by WSJT-X.

As soon as there was a bit of rainscatter, even though the signals were just as faint (but off-axis with no direct troposcatter component) I was able to get solid decodes. Same with PKT when there is a bit of ducting or RS, I can decode it easily, but troposcatter remains stubbornly undecoded.

I have a feeling that the only way we are going to be able to get down to decodes of SHF troposcatter at EME levels will be to move to the slow symbol rate techniques used at VLF, but with wide shifts. DFCW would be an obvious choice for simplicity and human-readability off the waterfall at those ridiculously weak signal levels, or we could look at doing something like the Slow-JT9 modification to drop the data rate of normal slow modes by an order of magnitude or more on receive. Trivial on transmit, but the receive side needs some deep thought.

Ultimately, if a beacon used a simple tone ID, sending 30 seconds of base tone, then 30 second symbols of three other tones in a predefined sequence, it would be possible to get unambiguous visual identifications of beacons at extremely low signal levels, just using Spectrum Lab or something to integrate the signals.

Neil G4DBN

On 21/08/2020 08:38, Andy G4JNT wrote:

#define  UnderstandPicSpeak   Flags, 0
'
btfsc  UnderstandPicSpeak
call   ReadAndUseListing
return

:-)  :-)  :-)

-- 
73
Barry, G8AGN


Re: 2 photos uploaded

Chris Bartram G4DGU
 

That looks to me like a pair of LNAs combined between quadrature hybrids; a typical solution for a mobile phone base-station LNA.  That gives a few advantages re a single device, such as we tend to use in amateur amplifiers:

Each amplifier sees a good load within the bandwidth of the hybrids, The outside world also sees a good match, and stability can be improved, the large signal handling will increase by a couple of dB, depending on how you express it, but the NF will increase by a bit over the insertion losses of the hybrids. There doesn't appear to be any filtering - which is to be expected, as base-station LNAs tend to need better filters than you could make on a PCB - many are pretty sophisticated designs

I can't comment further, as the definition of the photo I looked at wasn't good enough to see too much detail.

On 21/08/2020 15:02, UKMicrowaves@groups.io Notification wrote:

The following photos have been uploaded to the Aerial facilities limited 1800mhz GSM am album of the UKMicrowaves@groups.io group.

By: Andy GD1MIP


Change your notification settings


Re: FRANCO 12ghz to 24ghz doubler

Neil Smith G4DBN
 

Marvellous stuff, I'll have a proper read after work.

Ta, Neil

On 21/08/2020 15:33, Barry Chambers wrote:

Neil

this is what you want! See attached

73 Barry, G8AGN


On 21/08/2020 12:27, Neil Smith G4DBN wrote:

I can vouch for Andy's code working with my ADF5355s.  Saved me scrambling up the nursery slopes of the learning curve unaided.  I hacked it about for my own nefarious purposes of course, but 'tis a marvellous thing to have someone ploughing the furrow and showing how to make it work. Huge thanks as usual for the very useful resources.

Just one thing to consider before going for JT4 on the higher microwave bands.  I cannot get decodes from weak troposcatter signals on 10 GHz from GB3PKT or GB3OSW even when the signal is loud enough to HEAR, never mind see on a waterfall. I reckon that with these very long integration times, I can see signals at least 10 dB lower than those needed to get JT4 decodes.  The scintillation at 3 cm has components of amplitude variation close enough to the symbol rate to remove some symbols completely, often enough to wreck and chance of a decode.

I watched OSW for 30 minutes last night and I could see faint smears of troposcatter from the plain tone segments when I integrated for > 5 seconds per pixel that would have allowed *visual* decoding of DFCW or QRSS at perhaps 10 seconds per symbol, but it was way too weak, chopped up and spread out for any hope of detection by WSJT-X.

As soon as there was a bit of rainscatter, even though the signals were just as faint (but off-axis with no direct troposcatter component) I was able to get solid decodes. Same with PKT when there is a bit of ducting or RS, I can decode it easily, but troposcatter remains stubbornly undecoded.

I have a feeling that the only way we are going to be able to get down to decodes of SHF troposcatter at EME levels will be to move to the slow symbol rate techniques used at VLF, but with wide shifts. DFCW would be an obvious choice for simplicity and human-readability off the waterfall at those ridiculously weak signal levels, or we could look at doing something like the Slow-JT9 modification to drop the data rate of normal slow modes by an order of magnitude or more on receive. Trivial on transmit, but the receive side needs some deep thought.

Ultimately, if a beacon used a simple tone ID, sending 30 seconds of base tone, then 30 second symbols of three other tones in a predefined sequence, it would be possible to get unambiguous visual identifications of beacons at extremely low signal levels, just using Spectrum Lab or something to integrate the signals.

Neil G4DBN


-- 
73
Barry, G8AGN
-- 
Neil
http://g4dbn.uk


Re: FRANCO 12ghz to 24ghz doubler

Barry Chambers
 

Neil

this is what you want! See attached

73 Barry, G8AGN


On 21/08/2020 12:27, Neil Smith G4DBN wrote:

I can vouch for Andy's code working with my ADF5355s.  Saved me scrambling up the nursery slopes of the learning curve unaided.  I hacked it about for my own nefarious purposes of course, but 'tis a marvellous thing to have someone ploughing the furrow and showing how to make it work. Huge thanks as usual for the very useful resources.

Just one thing to consider before going for JT4 on the higher microwave bands.  I cannot get decodes from weak troposcatter signals on 10 GHz from GB3PKT or GB3OSW even when the signal is loud enough to HEAR, never mind see on a waterfall. I reckon that with these very long integration times, I can see signals at least 10 dB lower than those needed to get JT4 decodes.  The scintillation at 3 cm has components of amplitude variation close enough to the symbol rate to remove some symbols completely, often enough to wreck and chance of a decode.

I watched OSW for 30 minutes last night and I could see faint smears of troposcatter from the plain tone segments when I integrated for > 5 seconds per pixel that would have allowed *visual* decoding of DFCW or QRSS at perhaps 10 seconds per symbol, but it was way too weak, chopped up and spread out for any hope of detection by WSJT-X.

As soon as there was a bit of rainscatter, even though the signals were just as faint (but off-axis with no direct troposcatter component) I was able to get solid decodes. Same with PKT when there is a bit of ducting or RS, I can decode it easily, but troposcatter remains stubbornly undecoded.

I have a feeling that the only way we are going to be able to get down to decodes of SHF troposcatter at EME levels will be to move to the slow symbol rate techniques used at VLF, but with wide shifts. DFCW would be an obvious choice for simplicity and human-readability off the waterfall at those ridiculously weak signal levels, or we could look at doing something like the Slow-JT9 modification to drop the data rate of normal slow modes by an order of magnitude or more on receive. Trivial on transmit, but the receive side needs some deep thought.

Ultimately, if a beacon used a simple tone ID, sending 30 seconds of base tone, then 30 second symbols of three other tones in a predefined sequence, it would be possible to get unambiguous visual identifications of beacons at extremely low signal levels, just using Spectrum Lab or something to integrate the signals.

Neil G4DBN


-- 
73
Barry, G8AGN


Re: Aerial facilities 1800 mhz GSM amplifier information.

Andy GD1MIP
 

Just dragging this back to peoples attention.

I have been removing useful bits and pieces for projects (switches, plugs,  sockets, coax  etc) as they're full of quality items. However I have yet to use any of the modules.

Since I last asked has anyone come across Aerial Facilities documentation /  information?  I'd love to use the amp or bits of it.

Thanks Andy GD1MIP 

https://groups.io/g/UKMicrowaves/album?id=76586


Re: WG17 switch

Wilko
 

For people willing to do their own motorising and
are ok with WR90 I have just put this one up for
sale:


Wilko
PA1WBU


Re: FRANCO 12ghz to 24ghz doubler

Neil Smith G4DBN
 

I can vouch for Andy's code working with my ADF5355s.  Saved me scrambling up the nursery slopes of the learning curve unaided.  I hacked it about for my own nefarious purposes of course, but 'tis a marvellous thing to have someone ploughing the furrow and showing how to make it work. Huge thanks as usual for the very useful resources.

Just one thing to consider before going for JT4 on the higher microwave bands.  I cannot get decodes from weak troposcatter signals on 10 GHz from GB3PKT or GB3OSW even when the signal is loud enough to HEAR, never mind see on a waterfall. I reckon that with these very long integration times, I can see signals at least 10 dB lower than those needed to get JT4 decodes.  The scintillation at 3 cm has components of amplitude variation close enough to the symbol rate to remove some symbols completely, often enough to wreck and chance of a decode.

I watched OSW for 30 minutes last night and I could see faint smears of troposcatter from the plain tone segments when I integrated for > 5 seconds per pixel that would have allowed *visual* decoding of DFCW or QRSS at perhaps 10 seconds per symbol, but it was way too weak, chopped up and spread out for any hope of detection by WSJT-X.

As soon as there was a bit of rainscatter, even though the signals were just as faint (but off-axis with no direct troposcatter component) I was able to get solid decodes. Same with PKT when there is a bit of ducting or RS, I can decode it easily, but troposcatter remains stubbornly undecoded.

I have a feeling that the only way we are going to be able to get down to decodes of SHF troposcatter at EME levels will be to move to the slow symbol rate techniques used at VLF, but with wide shifts. DFCW would be an obvious choice for simplicity and human-readability off the waterfall at those ridiculously weak signal levels, or we could look at doing something like the Slow-JT9 modification to drop the data rate of normal slow modes by an order of magnitude or more on receive. Trivial on transmit, but the receive side needs some deep thought.

Ultimately, if a beacon used a simple tone ID, sending 30 seconds of base tone, then 30 second symbols of three other tones in a predefined sequence, it would be possible to get unambiguous visual identifications of beacons at extremely low signal levels, just using Spectrum Lab or something to integrate the signals.

Neil G4DBN

On 21/08/2020 08:38, Andy G4JNT wrote:

#define  UnderstandPicSpeak   Flags, 0
'
btfsc  UnderstandPicSpeak
call   ReadAndUseListing
return

:-)  :-)  :-)


WG17 switch

Paul G8AQA
 

You will need to hurry. Ending in a couple of hours. Looks a good price at the moment. No Bids.

https://www.ebay.co.uk/itm/392908086119?ul_noapp=true

Paul G8AQA

7241 - 7260 of 65011