Date   

Re: 10Ghz last night

Chris G0WUS
 

Ben most use a linear actuator to push the bottom of the dish out wards

Chris G0WUS

On 28/10/2020 16:26, militaryoperator via groups.io wrote:
Having a limited elevation adjustment has been a revelation, looking at plane scatter from more local planes at several degrees elevation, and for rainscatter too, often as high as 20 degrees to get over the Pennines, and half a degree or so to get into elevated ducts over the North Sea, with a 600ft hill in the way. I can also do a sun noise calibration of RX performance at any time the sun is in the right part of the sky. 100% worth the trouble.
----------------------

Thinking on this it occurred to me the normal sat dish mountings have a facility for elevation, usually, we tighten it up one pointing at sat. 

So there are brackets around which might lend to just such a job. Sketch. Note bump stops for min and max elevation.

The up down cord, string, wire etc could be wound around a spindle and either motorized or turned by hand (in my case). 

Off to the shed I go. 

Ben


Re: 10Ghz last night

militaryoperator
 

Having a limited elevation adjustment has been a revelation, looking at plane scatter from more local planes at several degrees elevation, and for rainscatter too, often as high as 20 degrees to get over the Pennines, and half a degree or so to get into elevated ducts over the North Sea, with a 600ft hill in the way. I can also do a sun noise calibration of RX performance at any time the sun is in the right part of the sky. 100% worth the trouble.
----------------------

Thinking on this it occurred to me the normal sat dish mountings have a facility for elevation, usually, we tighten it up one pointing at sat. 

So there are brackets around which might lend to just such a job. Sketch. Note bump stops for min and max elevation.

The up down cord, string, wire etc could be wound around a spindle and either motorized or turned by hand (in my case). 

Off to the shed I go. 

Ben
Image (46).jpg


Re: New to me ...

Robin Szemeti - G1YFG
 

Well, Paul ... you were spot on.   I left the meter connected for a while and sure enough, it went bang, with the usual horrible smell from the mains filter.

It still has some other fault, I shall keep investigating.


On Thu, 22 Oct 2020 at 00:47, Paul G8KFW <paul@...> wrote:

Hi Robin

 

Regarding the "slightly dysfunctional" meter

If you are talking about a Marconi  6960 B   then watch out for the IEC socket as it is also a mains filter  and  they have a tendency to go bang 

I hade 3 Marconi  6960 B   on soak test  a few  years ago and within 48 hours 2 of the 3 blow their IEC mans filters replaced the IEC mans filters and all was OK

and don’t forget the Marconi lead is not compatible with the HP power meter

 

Re a 26 Ghz analyzer these tend to be expensive  suggest you look at a 18  or 22 Ghz analyser  but go for one with a preselector and external mixer facility

Then you can use an external mixer for 24 Ghz

 

A good combination is the HP 8569  and a HP 11970  wave guide mixer  either  the  18 – 26 Ghz  or the   26-40 Ghz   will be OK for 24 Ghz  as it is good to below 22 Ghz

A less expensive option is the HP8565  and this can use any single point external mixer as the dyplexer is inside the analyser

 

Feale free to PM me for more information on HP test equipment  

 

Paul


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
Sent: 21 October 2020 22:39
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] New to me ...

 

Finally picked up a nice power sensor and have a "slightly dysfunctional" meter for it coming, hopefully the meter is an easy fix.  This should address my power measurement guesstimates at least! 

 

I also managed to get a "not quite accurate, but calibrated against a good standard"  diode head for the HP meter.   It's off by about 3dB, but the seller was a t&m collector and had access to some good standards to calibrate against, so while it is "out" at least I know how much it is "out" by!

 

I also picked up a nice Marconi/IFR 100khz to 20GHz sweeper/sig gen a while ago that addresses another missing piece of the puzzle ... just need a decent 26g analyzer now to add to the 1.8G HP and I think my thirst for measurement gear will be (temporarily) abated!

 

image.png


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Redpoint Consulting Limited

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Paul Bicknell G8KFW   South Coast UK


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Robin Szemeti - G1YFG


WSJT without upconversion

Andy G4JNT
 

It looks like WSJT-X is never going to offer a digital output version of the tones.  So to counter that I wrote a bit of pic code that measures the instantaneous frequency, ie. actually measures the tone period.   That gives a near-instant response to tone changes so ought, theoretically, to cope with the fast modes as well

At the moment all I do is decode the tone into a tone-No. count and display this on LEDs connected directly to pic O/P lines. This prog was only a demonstrator, but a simple D/A made up just from resistors acting on a 10MHz reference will allow direct generation wihtout having to upconvert from PC audio.   One idea I'll be investigatoing, put the reconstituted step voltage waveform into an integrator (op-amp type) and use to PHASE modulate a 10MHz source.

Take a look at this video of it reconstituting the 9 tones from a JT9H waveform.   Other (wide shift) modes can be coped with by changing a few variables and a small look-up table in the PIC.


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Re: Thankyou on 13cms tonight

Robin Szemeti - G1YFG
 

Indeed it was, and especially nice to work so many without resorting to KST!   The signal from VKV was blisteringly loud!  I shall add a masthead preamp, as I was generally getting better reports than I was giving, so it is the RX end that needs the work now. I don't think the device in the front of the tvtr is particularly good, and  the 10+ metres of LDF4-50 will add a little more. A decent pre should help.



On Wed, 28 Oct 2020 at 12:36, DAVID G4ASR via groups.io <g4asr=btinternet.com@groups.io> wrote:
Good to work you last night Robin. 

Running 20w from an SG-Labs SSPA, 75ft up, at masthead, to a 67-element Wimo. 
A very short 1-metre length of hardline to the driven element so virtually no loss.

I worked 12 locator squares, ODX 520km with GM4JTJ via aircraft scatter.

Got 2 meeps in last 2-minutes. If anyone wants an almost guaranteed QSO - do it earlier.

73
David G4ASR  


--
Robin Szemeti - G1YFG


Re: 10Ghz last night

Neil Smith G4DBN
 

I use a waveguide feed from the horn back to the masthead units, which are bolted to the back of the dish mount. It is just about feasible to use a simple axial slewing ring even for an offset dish, but perhaps a smaller and lighter fix is to rotate my Pickett-Potter horn, which has a section of flex-twist guide to connect it to the main waveguide. Another approach is like the design in DUBUS using a set of thin rings in a tube with slots and pins to allow rotation of up to 90 degrees of the horn.  Spinning the whole dish has advantages in terms of lower loss in the waveguide, but whether all that engineering is worth it for the half-dozen extra contacts I'd make each year is highly questionable.  Putting the waveguide relay and LNA right at the feedpoint would be the obvious solution, I'd lose a dB or so on TX through the rotary coupling, but I could just run more power to compensate.

Neil G4DBN

On 28/10/2020 13:15, Chris G0WUS wrote:

Hi Neil, Many i worked using cw and only usually cw (not doable usually with ssb) we went to ssb after to confirm and would have been easier. Yes was thinking nbfm the way forward maybe. Elevation is defo on the job list for improvements could just do with 26 hours per day not 24!!

Im sure you have been working ideas for polarisation rotation surely if its a PF dish just a very tiny stepper on the feed holder could be made think guy ring at the top of the scam12. Im assuming your using a PF dish sorry not sure what would happen on a offset dish rotating the feed may work to without upsetting the pattern.

My neighbour (bit of a skip hunter) this morning kindly shouted over the fence as I was taking the shf kit down I have a bag of bits for you. Its was a bag full of clamps and brackets all useful to us guys so was happy. I mentioned if you see anyone skipping used sat dishes which are not to shabby let me know. Well 10 mins later another shout and x2 dishes passed over the fence. He had taken them off his house there and then saying they only use the new mini dish.

this is perfect as one is almost identical to my current 3cm dish so i can try some other feeds and run them both on a relay up the mast for live comparisons.

Also Ben yes you were getting 44 that may have been my bad cw lol (probo the condx) i was getting about 8-12 dits when should have been a 5 lol

73 Chris G0WUS


On 28/10/2020 12:50, Neil Smith G4DBN wrote:

I find it it often best to drop to REALLY slow CW, around 6 wpm or so, to counteract the dropouts from scintillation on weak troposcatter. One useful approach under stupidly weak signal conditions is to use SpectrumLab to pull out inaudible CW at a rate of one second per dot or less using your eyes instead of your ears. QRSS 3 is perhaps too slow in a busy contest, but even 1 second dots do start to stand out, particularly if you use narrow FSK CW instead of on-off keying. I guess that would still be within the rules.

Also don't forget that NBFM is often more readable than SSB for rainscatter contacts.

Having a limited elevation adjustment has been a revelation, looking at plane scatter from more local planes at several degrees elevation, and for rainscatter too, often as high as 20 degrees to get over the Pennines, and half a degree or so to get into elevated ducts over the North Sea, with a 600ft hill in the way. I can also do a sun noise calibration of RX performance at any time the sun is in the right part of the sky. 100% worth the trouble.

What I haven't implemented yet is polarisation rotation so that off-axis rainscatter at 90 degrees included angle might work better.

Good fun, all this buggering about with tech and hardware just to get those tiny improvement which add up to a successful contact.

Neil G4DBN

On 28/10/2020 12:18, militaryoperator via groups.io wrote:
Ben thanks for the QSO last night I enjoyed it somewhat the RS / multipath on 3cm was making it extremely hard with cw  
73 Chris G0WUS

Good to work you last night Ben. Think that was our first time on 3cm. 
73 David G4ASR
--------------------------------------


Thanks Chris and David. 

Yes, on your CW Chris I was getting very confused, it sounded like HH rather than 55, glad we managed on ssb.

My setup at the moment is Kuhne trvrt and 2W pa (2.5W) into 46cm PF dish which should have been about 55ft but sticking mast section made it lower. 

-- 
Neil
http://g4dbn.uk


Re: 10Ghz last night

Chris G0WUS
 

Hi Neil, Many i worked using cw and only usually cw (not doable usually with ssb) we went to ssb after to confirm and would have been easier. Yes was thinking nbfm the way forward maybe. Elevation is defo on the job list for improvements could just do with 26 hours per day not 24!!

Im sure you have been working ideas for polarisation rotation surely if its a PF dish just a very tiny stepper on the feed holder could be made think guy ring at the top of the scam12. Im assuming your using a PF dish sorry not sure what would happen on a offset dish rotating the feed may work to without upsetting the pattern.

My neighbour (bit of a skip hunter) this morning kindly shouted over the fence as I was taking the shf kit down I have a bag of bits for you. Its was a bag full of clamps and brackets all useful to us guys so was happy. I mentioned if you see anyone skipping used sat dishes which are not to shabby let me know. Well 10 mins later another shout and x2 dishes passed over the fence. He had taken them off his house there and then saying they only use the new mini dish.

this is perfect as one is almost identical to my current 3cm dish so i can try some other feeds and run them both on a relay up the mast for live comparisons.

Also Ben yes you were getting 44 that may have been my bad cw lol (probo the condx) i was getting about 8-12 dits when should have been a 5 lol

73 Chris G0WUS


On 28/10/2020 12:50, Neil Smith G4DBN wrote:

I find it it often best to drop to REALLY slow CW, around 6 wpm or so, to counteract the dropouts from scintillation on weak troposcatter. One useful approach under stupidly weak signal conditions is to use SpectrumLab to pull out inaudible CW at a rate of one second per dot or less using your eyes instead of your ears. QRSS 3 is perhaps too slow in a busy contest, but even 1 second dots do start to stand out, particularly if you use narrow FSK CW instead of on-off keying. I guess that would still be within the rules.

Also don't forget that NBFM is often more readable than SSB for rainscatter contacts.

Having a limited elevation adjustment has been a revelation, looking at plane scatter from more local planes at several degrees elevation, and for rainscatter too, often as high as 20 degrees to get over the Pennines, and half a degree or so to get into elevated ducts over the North Sea, with a 600ft hill in the way. I can also do a sun noise calibration of RX performance at any time the sun is in the right part of the sky. 100% worth the trouble.

What I haven't implemented yet is polarisation rotation so that off-axis rainscatter at 90 degrees included angle might work better.

Good fun, all this buggering about with tech and hardware just to get those tiny improvement which add up to a successful contact.

Neil G4DBN

On 28/10/2020 12:18, militaryoperator via groups.io wrote:
Ben thanks for the QSO last night I enjoyed it somewhat the RS / multipath on 3cm was making it extremely hard with cw  
73 Chris G0WUS

Good to work you last night Ben. Think that was our first time on 3cm. 
73 David G4ASR
--------------------------------------


Thanks Chris and David. 

Yes, on your CW Chris I was getting very confused, it sounded like HH rather than 55, glad we managed on ssb.

My setup at the moment is Kuhne trvrt and 2W pa (2.5W) into 46cm PF dish which should have been about 55ft but sticking mast section made it lower. 


Re: 10Ghz last night

Neil Smith G4DBN
 

I find it it often best to drop to REALLY slow CW, around 6 wpm or so, to counteract the dropouts from scintillation on weak troposcatter. One useful approach under stupidly weak signal conditions is to use SpectrumLab to pull out inaudible CW at a rate of one second per dot or less using your eyes instead of your ears. QRSS 3 is perhaps too slow in a busy contest, but even 1 second dots do start to stand out, particularly if you use narrow FSK CW instead of on-off keying. I guess that would still be within the rules.

Also don't forget that NBFM is often more readable than SSB for rainscatter contacts.

Having a limited elevation adjustment has been a revelation, looking at plane scatter from more local planes at several degrees elevation, and for rainscatter too, often as high as 20 degrees to get over the Pennines, and half a degree or so to get into elevated ducts over the North Sea, with a 600ft hill in the way. I can also do a sun noise calibration of RX performance at any time the sun is in the right part of the sky. 100% worth the trouble.

What I haven't implemented yet is polarisation rotation so that off-axis rainscatter at 90 degrees included angle might work better.

Good fun, all this buggering about with tech and hardware just to get those tiny improvement which add up to a successful contact.

Neil G4DBN

On 28/10/2020 12:18, militaryoperator via groups.io wrote:
Ben thanks for the QSO last night I enjoyed it somewhat the RS / multipath on 3cm was making it extremely hard with cw  
73 Chris G0WUS

Good to work you last night Ben. Think that was our first time on 3cm. 
73 David G4ASR
--------------------------------------


Thanks Chris and David. 

Yes, on your CW Chris I was getting very confused, it sounded like HH rather than 55, glad we managed on ssb.

My setup at the moment is Kuhne trvrt and 2W pa (2.5W) into 46cm PF dish which should have been about 55ft but sticking mast section made it lower. 


Re: Thankyou on 13cms tonight

DAVID G4ASR
 

Good to work you last night Robin. 

Running 20w from an SG-Labs SSPA, 75ft up, at masthead, to a 67-element Wimo. 
A very short 1-metre length of hardline to the driven element so virtually no loss.

I worked 12 locator squares, ODX 520km with GM4JTJ via aircraft scatter.

Got 2 meeps in last 2-minutes. If anyone wants an almost guaranteed QSO - do it earlier.

73
David G4ASR  


Re: 10Ghz last night

Clive Elliott GW4MBS
 

It was a bit grim from the bottom of the IO71 valley last night, in fact disastrous.

I was on KST & monitoring the beacons for most of last night waiting for RS which is my only real hope of getting out.

Normally I can hear nothing from down here, but at 2115 GB3KBQ & GB3SCX came up to S3 over a 90 deg quadrant with heavy lumpy rain overhead. Had G4UVZ Taunton been available we would have worked as we always do with rain. I then had to look on KST for my next most likely candidates, but they all seemed to be engaged, then it dried up at 2127 & my opening was over :(
--
Clive GW4MBS (ex-G8ADP)
Pottering on 6m - 3cm in a valley in IO71XW where any QSO is a triumph of optimism over geography!


Re: 10Ghz last night

militaryoperator
 

Ben thanks for the QSO last night I enjoyed it somewhat the RS / multipath on 3cm was making it extremely hard with cw  
73 Chris G0WUS

Good to work you last night Ben. Think that was our first time on 3cm. 
73 David G4ASR
--------------------------------------


Thanks Chris and David. 

Yes, on your CW Chris I was getting very confused, it sounded like HH rather than 55, glad we managed on ssb.

My setup at the moment is Kuhne trvrt and 2W pa (2.5W) into 46cm PF dish which should have been about 55ft but sticking mast section made it lower. 

DSCF3089.JPG

73, Ben G4BXD


Re: 10Ghz last night

DAVID G4ASR
 

Good to work you last night Ben. Think that was our first time on 3cm. 

My 50cm dish was up at 60ft above ground,, 13cm Yagi at 75ft. QTH is 700ft asl. Clear in nearly all directions.

IC-9700, Kuhne transverter, DL2AM PA, 5w, Procomm dish/feed, GPS locked, Positional accuracy around 2 degrees. 

On 3cm I worked 9 locator squares, IO81, IO82, IO83,  IO91, IO92 (4), IO93 (3), IO94, JO01, JO02 .... 14 qso's.

73 David G4ASR


Re: 10Ghz last night

Chris G0WUS
 

Ben thanks for the QSO last night I enjoyed it somewhat the RS / multipath on 3cm was making it extremely hard with cw often getting x3 or more of each dot dash.

This made it more fun we would not want it to easy HI (well maybe every so often)

Activity was good I felt and yes many failures but a few surprises im sure to.

All activity is good activity at shf spread the word.

73 Chris G0WUS


On 28/10/2020 09:51, militaryoperator via groups.io wrote:
Many thanks to those with who I worked, poor condx again I guess, seemed to see lots of failed qso's scrolling up on KST.

Missed out with XDY, BRK, HAJ, EML, PPA/P, LBK/P and DFL/P which would have made for a better score.

As I extended my mast one section would not budge after last Tuesday's rain had got to it so dish a Mtr lower than expected. 

cheers, Ben G4BXD




--------------------------------------
Curator, Owner and Display coordinator
Military Wireless Museum
Kidderminster, UK.

This message was meant for the recipient
Any likeness to persons living or dead is odd
---------------------------------------


10Ghz last night

militaryoperator
 

Many thanks to those with who I worked, poor condx again I guess, seemed to see lots of failed qso's scrolling up on KST.

Missed out with XDY, BRK, HAJ, EML, PPA/P, LBK/P and DFL/P which would have made for a better score.

As I extended my mast one section would not budge after last Tuesday's rain had got to it so dish a Mtr lower than expected. 

cheers, Ben G4BXD




--------------------------------------
Curator, Owner and Display coordinator
Military Wireless Museum
Kidderminster, UK.

This message was meant for the recipient
Any likeness to persons living or dead is odd
---------------------------------------


Re: Thankyou on 13cms tonight

John Lemay
 

Robin

 

Good to work you last night – a decent signal under so-so conditions.

 

My biggest disappointment was the significant number of Meeps and QSO attempts that I could not fit within the contest period – sorry chaps. 3 hours is quite long enough to sit in the chair, yet I always run out of time !

 

John G4ZTR

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Robin Szemeti - G1YFG
Sent: 28 October 2020 00:21
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Thankyou on 13cms tonight

 

A pleasure to finally work more than a couple of stations on 13cm tonight.   It really was quite horrible weather, so I worked it from home instead of up a hill, but did manage 12 contacts and  odx of 222km,  best yet!

 


--

Best regards,

Robin Szemeti


--
Robin Szemeti - G1YFG


Virus-free. www.avg.com


Thankyou on 13cms tonight

Robin Szemeti - G1YFG
 

A pleasure to finally work more than a couple of stations on 13cm tonight.   It really was quite horrible weather, so I worked it from home instead of up a hill, but did manage 12 contacts and  odx of 222km,  best yet!


--
Best regards,

Robin Szemeti



--
Robin Szemeti - G1YFG


Re: New user to 13cm an 9cm. NOV question for UK use.

Nick Gregory G0HIK
 

No he is only keen on 23cms, but I'm working on him.
Nick G0HIK


Re: New user to 13cm an 9cm. NOV question for UK use.

Andy GD1MIP
 

G0HIK

OK Nick. Will do. I will be up on the hill with 13cm / 3 ele / 2.5w  and 9cm / 5 ele / 3 w.  KST should be ok by phone.  Is Chris M0KPW? out too

Andy GD1MIP


Re: New user to 13cm an 9cm. NOV question for UK use.

Nick Gregory G0HIK
 

Hi Andy,

If you see me on KST, please Meep me. It's should be quite an easy path, just across the Irish sea to Cumbria, even with my low power, 2.5w and 27 ele.

I'll either setup from home on the drive or if I can raise the enthusiasm, I'll pop out to a high spot for an hour.

Nick G0HIK IO84


Re: 10 GHz RSGB AC tonight

militaryoperator
 

revised, winds look low enough


G4BXD  IO82UJ

10Ghz       2.5W   46cm dish

via: kst    19:30-22:30 depending on wx

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