Date   

Re: Commercially made Yagi for 2.3 & 3.4GHz

Neil Smith G4DBN
 

https://directivesystems.com/2304-mhz-above/9-cm-antennas-3456-mhz/

They may do a decent discount on 9cm loop yagis now the US have lost the band, but heaven only knows what the shipping would be.

Neil G4DBN

On 29/10/2020 14:04, Andy GD1MIP wrote:
Folks,  I have now got transverters running for 13cm and 9cm.  I have successfully used them with small PCB yagi's. My ultimate goal is to make a feed to a NOS 1.2m Andrew dish sitting in my shed, mount it on a trailer and go /P. A real winter project.

But for now a quick option would be premade yagi's centred around 2320.200MHz  and 3400.100 MHz.
Can anyone recommend a company producing yagi's of at least 30 elements?

Thanks Andy GD1MIP


Re: Commercially made Yagi for 2.3 & 3.4GHz

Andy G4JNT
 

For 3.4GHz you may do better with a flat plate antenna.   
30cm square, gain ~ 21dBi  
Not sure if you can get them for 2.3GHz



Virus-free. www.avg.com


On Thu, 29 Oct 2020 at 14:04, Andy GD1MIP <gd1mip@...> wrote:
Folks,  I have now got transverters running for 13cm and 9cm.  I have successfully used them with small PCB yagi's. My ultimate goal is to make a feed to a NOS 1.2m Andrew dish sitting in my shed, mount it on a trailer and go /P. A real winter project.

But for now a quick option would be premade yagi's centred around 2320.200MHz  and 3400.100 MHz. 
Can anyone recommend a company producing yagi's of at least 30 elements?

Thanks Andy GD1MIP


Re: 122?

John Quarmby
 

The following will appear in Scatterpoint shortly:

A UK Microwave Group Online Lecture streamed by the BATC

Wednesday 11th November 2020 at 20:00

Chris Whitmarsh G0FDZ will be presenting his guide to the millimetre waves in this online talk. He will cover all aspects of the millimetre bands including users, propagation, antennas and feeders, basic equipment for each band to 241 GHz and beyond, and finish with mentioning the use of SDR for identifying weak signals.

There should be something in the talk for everyone from beginner on the millimetre bands to expert. However, there is no heavy maths or theory to blow your mind!

The talk will be streamed on this URL:

https://batc.org.uk/live/ukmicrowave

We look forward to welcoming all to the talk.

Please put the 9th December 2020 in your diary for the next talk in this series.

73

John G3XDY

UKuG Secretary

On 29/10/2020 09:58, militaryoperator via groups.io wrote:

There was mention of some zoom or such on  using 122Ghz soon. 

Where and when?


Ben





--------------------------------------
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
---------------------------------------


Virus-free. www.avast.com


Commercially made Yagi for 2.3 & 3.4GHz

Andy GD1MIP
 

Folks,  I have now got transverters running for 13cm and 9cm.  I have successfully used them with small PCB yagi's. My ultimate goal is to make a feed to a NOS 1.2m Andrew dish sitting in my shed, mount it on a trailer and go /P. A real winter project.

But for now a quick option would be premade yagi's centred around 2320.200MHz  and 3400.100 MHz. 
Can anyone recommend a company producing yagi's of at least 30 elements?

Thanks Andy GD1MIP


Re: 2320 PA Modifications?

militaryoperator
 

Sig get in, 28v connected, 50db attenuation to power meter. Odd readings though. 
I get about 1.3A standing on the right side, 0.4A on the left. 
The circulator is still in place and best o/p was at about 11dbm in. 
Power meter read 0.16mW, which at -50db is 16W? but, the 50W 30db attenuator was getting very warm, the amp case was hot and the heatsink, as was the o/p connector, an sma socket soldered to an smb? or whatever plug plugged into o/p socket. I think there was more power than I'm measuring for some reason.

I was right to think I had more power than I measured. Dumbkoff here just looked at his lead to power meter which still had attenuator attached. I thought I'd used a 20db with my good 30db one.....but........ its another 30db one. 

So, seems I had 160W coming out of my amp, no wonder it was getting hot!

What do they say, measure twice, cut once?

I'll get the hang of this hobby soon. 

Ben 




Re: 10Ghz last night

Keith GW3TKH
 

David,


G4ALY from a scatterpoint around Lundy Is in the Bristol Channel....some years ago.

73 Keith
GW3TKH



On Wednesday, 28 October 2020, 23:49:56 GMT, david656179 via groups.io <david.m.k@...> wrote:


I also extend my thanks to all who tried last night in what was my first 10 Ghz nb experience.  I was QRP with just 100mW at the waveguide probe.  G4ZTR was a massive signal with me but he did not hear me.  I had good fortune to hook up with G4ODA before the contest and he kindly made me his first contact at the start of contest, he was also a massive signal.  After may tries via KST and fails, G4CLA took time out to work me, he started with CW and then to SSB because I am yet to master it.  He was loud but had heavy doppler and other distortions.  Leicester, GB3LEX was a consistent signal on two clear bearings the 20 deg off one was much stronger however.  Since visually this has clear take off for many miles and as others have said rain scatter disappeared before start of contest, it seemed to suggest a strong reflection more locally to the beacon site.  I took the fact that since I could hear this beacon my RX was acceptable.  GB3CAM as expected, was a massive signal and regardless of beam heading, could be heard all the time.

The bulk of the stations that I should have been able to work were obstructed by a copse of evergreen trees that only five years ago would not have been a problem.  I will have to find a new position on the ridge to avoid or I guess with the aid of aircraft or rain scatter could still work those directions.

I am very interested to read that under some circumstances NBFM can produce better results.  Meantime I am going to attempt a tune up of the PA's and more importantly improve the frequency stability, also stopping the frequency shift that was noted by G4ODA.  And I think a bigger dish, however the old PW wideband penny feed dish is so easy from a mechanical point of view.  So lots to do.

It would be considered foolish of me to go portable alone on such a cold and windy night, I will and am suffering for it, but as somebody else commented, strangely I enjoyed the experience.  Also I neither got stuck in the mud or put the car or myself into the ditch which is a bonus.

73 David G6KWA

So thanks again everybody, see you again on 10 Ghz.


Re: 10Ghz last night

militaryoperator
 

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. 
73 David G4ASR
--------------------------------

Sounds good David. I was hoping to have 4W on 3Cm as there were some pa's being offered, unfortunately, seller must be, how can I phrase it in PC terms?,  "having problems". 

Supposedly ex big wig in now-defunct ham radio company but did not even know his own PayPal account details. Come to think on it, might well have been a scam. 

So the search goes on for a bit more power for 3. 

Ben G4BXD


122?

militaryoperator
 

There was mention of some zoom or such on  using 122Ghz soon. 

Where and when?


Ben





--------------------------------------
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: 10Ghz last night

Neil Smith G4DBN
 

Hi David, NBFM works well when there is a very high level of doppler spreading from rainscatter, which can make SSB almost incomprehensible.  Obviously you need a fair bit of signal to get it to work and be close to fully quieting.  Even if there is 800 Hz of rain doppler, which makes CW sound like VHF auroral signals, almost a growl or hiss instead of a tone, the FM demodulator can work very well despite all of the spreading.

I have some trees (well, 120 trees) between me and most of IO90/91/92, so the only way I can work stations in those squares via rainscatter, or if there is excellent tropospheric ducting, via reflections off Drax power station chimney or the local windfarms.

Hope to catch you in a future session.

Neil G4DBN

On 28/10/2020 23:49, david656179 via groups.io wrote:
I also extend my thanks to all who tried last night in what was my first 10 Ghz nb experience.  I was QRP with just 100mW at the waveguide probe.  G4ZTR was a massive signal with me but he did not hear me.  I had good fortune to hook up with G4ODA before the contest and he kindly made me his first contact at the start of contest, he was also a massive signal.  After may tries via KST and fails, G4CLA took time out to work me, he started with CW and then to SSB because I am yet to master it.  He was loud but had heavy doppler and other distortions.  Leicester, GB3LEX was a consistent signal on two clear bearings the 20 deg off one was much stronger however.  Since visually this has clear take off for many miles and as others have said rain scatter disappeared before start of contest, it seemed to suggest a strong reflection more locally to the beacon site.  I took the fact that since I could hear this beacon my RX was acceptable.  GB3CAM as expected, was a massive signal and regardless of beam heading, could be heard all the time.

The bulk of the stations that I should have been able to work were obstructed by a copse of evergreen trees that only five years ago would not have been a problem.  I will have to find a new position on the ridge to avoid or I guess with the aid of aircraft or rain scatter could still work those directions.

I am very interested to read that under some circumstances NBFM can produce better results.  Meantime I am going to attempt a tune up of the PA's and more importantly improve the frequency stability, also stopping the frequency shift that was noted by G4ODA.  And I think a bigger dish, however the old PW wideband penny feed dish is so easy from a mechanical point of view.  So lots to do.

It would be considered foolish of me to go portable alone on such a cold and windy night, I will and am suffering for it, but as somebody else commented, strangely I enjoyed the experience.  Also I neither got stuck in the mud or put the car or myself into the ditch which is a bonus.

73 David G6KWA


Re: 10Ghz last night

david656179
 

I also extend my thanks to all who tried last night in what was my first 10 Ghz nb experience.  I was QRP with just 100mW at the waveguide probe.  G4ZTR was a massive signal with me but he did not hear me.  I had good fortune to hook up with G4ODA before the contest and he kindly made me his first contact at the start of contest, he was also a massive signal.  After may tries via KST and fails, G4CLA took time out to work me, he started with CW and then to SSB because I am yet to master it.  He was loud but had heavy doppler and other distortions.  Leicester, GB3LEX was a consistent signal on two clear bearings the 20 deg off one was much stronger however.  Since visually this has clear take off for many miles and as others have said rain scatter disappeared before start of contest, it seemed to suggest a strong reflection more locally to the beacon site.  I took the fact that since I could hear this beacon my RX was acceptable.  GB3CAM as expected, was a massive signal and regardless of beam heading, could be heard all the time.

The bulk of the stations that I should have been able to work were obstructed by a copse of evergreen trees that only five years ago would not have been a problem.  I will have to find a new position on the ridge to avoid or I guess with the aid of aircraft or rain scatter could still work those directions.

I am very interested to read that under some circumstances NBFM can produce better results.  Meantime I am going to attempt a tune up of the PA's and more importantly improve the frequency stability, also stopping the frequency shift that was noted by G4ODA.  And I think a bigger dish, however the old PW wideband penny feed dish is so easy from a mechanical point of view.  So lots to do.

It would be considered foolish of me to go portable alone on such a cold and windy night, I will and am suffering for it, but as somebody else commented, strangely I enjoyed the experience.  Also I neither got stuck in the mud or put the car or myself into the ditch which is a bonus.

73 David G6KWA

So thanks again everybody, see you again on 10 Ghz.


Re: 10Ghz last night

Martin Phillips G4CIO
 

Well 0.1 deg precision and resolution. I doubt if it's accurate to that but it does seem good to the 1 deg that I wanted - at least it gives a consistent reading for the level of my desk and the desk offset by a pencil under the casing of the sensor. Plenty of Arduino scripts around, I cannibalised one to make something that works. The whole lot of sensor, Arduino nano and a 4 digit seven seg display came to around £10 IIRC.

On 28/10/20 9:30 PM, Dave Brown wrote:

Care to elaborate, Martin? (0.1 deg res)

73

Dave, ZL3FJ

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Martin Phillips G4CIO
Sent: Thursday, October 29, 2020 07:39
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 10Ghz last night

 

Fairly easy to do with a MPU-6050 3-axis gyroscope module plus an Arduino. Mine displays a resolution of 1 deg as that will be enough for my dish when I get it up, but simple enough to arrange for a precision of 0.1 deg.

 

Martin/

 

 

On 28/10/20 5:51 PM, Chris G0WUS wrote:

One with a feedback position sensor even better can then knock up a pic / arduino controller with deg display

Chris G0WUS

On 28/10/2020 17:02, Neil Smith G4DBN wrote:

You can just use a bit of coarse threaded bar as an elevation drive, with a large pulley on the end and a long string, with a bit of Delrin or PTFE as the nut.  However, there are plenty of little actuators with a 2 or 4 inch stroke, which weigh less than a pound and cost around £22. You only need a fraction of the power of those to elevate a small dish.

Neil G4DBN

 

 



Re: 10Ghz last night

Dave Brown
 

Care to elaborate, Martin? (0.1 deg res)

73

Dave, ZL3FJ

 

 

From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Martin Phillips G4CIO
Sent: Thursday, October 29, 2020 07:39
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 10Ghz last night

 

Fairly easy to do with a MPU-6050 3-axis gyroscope module plus an Arduino. Mine displays a resolution of 1 deg as that will be enough for my dish when I get it up, but simple enough to arrange for a precision of 0.1 deg.

 

Martin/

 

 

On 28/10/20 5:51 PM, Chris G0WUS wrote:

One with a feedback position sensor even better can then knock up a pic / arduino controller with deg display

Chris G0WUS

On 28/10/2020 17:02, Neil Smith G4DBN wrote:

You can just use a bit of coarse threaded bar as an elevation drive, with a large pulley on the end and a long string, with a bit of Delrin or PTFE as the nut.  However, there are plenty of little actuators with a 2 or 4 inch stroke, which weigh less than a pound and cost around £22. You only need a fraction of the power of those to elevate a small dish.

Neil G4DBN

 

 


Re: 10Ghz last night

Chris G0WUS
 

If it works it works Jerry sounds like a good fast easy fix. When I did 6m /p every month last year I used several rolls of gaffer tape over the season to solve problems you would not dare do at home but risk factor for a 2.5h contest is just about doable.

73 Chris G0WUS 



Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: on4cjq@...
Date: 28/10/2020 7:29 pm (GMT+00:00)
To: UKMicrowaves <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] 10Ghz last night

Hello,

When i go /p with my µwave equipment, i use a yaesu 550 EL rotor. Because the controller box isn't accurate enough, i got myself an electonic water (spirit) level. Taken out the display-sensor unit from it, and just seperated the sensor from the display-battery compartment with a 12m 7cores rotorcable. Sensor is at the dish, display-battery compartment in the car. Only 30min to fix this solution...yes...i'm too lazy for getting into Arduino stuff etc.

73's
Jerry,ON4CJQ

 



Van: "Martin Phillips G4CIO" <martin@...>
Aan: "UKMicrowaves" <UKMicrowaves@groups.io>
Verzonden: Woensdag 28 oktober 2020 19:39:17
Onderwerp: Re: [UKMicrowaves] 10Ghz last night

Fairly easy to do with a MPU-6050 3-axis gyroscope module plus an Arduino. Mine displays a resolution of 1 deg as that will be enough for my dish when I get it up, but simple enough to arrange for a precision of 0.1 deg.

Martin/


On 28/10/20 5:51 PM, Chris G0WUS wrote:

One with a feedback position sensor even better can then knock up a pic / arduino controller with deg display

Chris G0WUS

On 28/10/2020 17:02, Neil Smith G4DBN wrote:

You can just use a bit of coarse threaded bar as an elevation drive, with a large pulley on the end and a long string, with a bit of Delrin or PTFE as the nut.  However, there are plenty of little actuators with a 2 or 4 inch stroke, which weigh less than a pound and cost around £22. You only need a fraction of the power of those to elevate a small dish.

Neil G4DBN





Re: 10Ghz last night

on4cjq@...
 

Hello,

When i go /p with my µwave equipment, i use a yaesu 550 EL rotor. Because the controller box isn't accurate enough, i got myself an electonic water (spirit) level. Taken out the display-sensor unit from it, and just seperated the sensor from the display-battery compartment with a 12m 7cores rotorcable. Sensor is at the dish, display-battery compartment in the car. Only 30min to fix this solution...yes...i'm too lazy for getting into Arduino stuff etc.

73's
Jerry,ON4CJQ

 



Van: "Martin Phillips G4CIO" <martin@...>
Aan: "UKMicrowaves" <UKMicrowaves@groups.io>
Verzonden: Woensdag 28 oktober 2020 19:39:17
Onderwerp: Re: [UKMicrowaves] 10Ghz last night

Fairly easy to do with a MPU-6050 3-axis gyroscope module plus an Arduino. Mine displays a resolution of 1 deg as that will be enough for my dish when I get it up, but simple enough to arrange for a precision of 0.1 deg.

Martin/


On 28/10/20 5:51 PM, Chris G0WUS wrote:

One with a feedback position sensor even better can then knock up a pic / arduino controller with deg display

Chris G0WUS

On 28/10/2020 17:02, Neil Smith G4DBN wrote:

You can just use a bit of coarse threaded bar as an elevation drive, with a large pulley on the end and a long string, with a bit of Delrin or PTFE as the nut.  However, there are plenty of little actuators with a 2 or 4 inch stroke, which weigh less than a pound and cost around £22. You only need a fraction of the power of those to elevate a small dish.

Neil G4DBN





Re: 10Ghz last night

militaryoperator
 

One with a feedback position sensor even better can then knock up a pic / arduino controller with deg display
Chris G0WUS


Wow Chris, it's gone from a bit of string to an actuator and Arduino controller, which no doubt needs a little screen, regulated PSU, switches, sockets and connectors. 


Talk about re-inventing the wheel !!!


Ben


Re: 10Ghz last night

Martin Phillips G4CIO
 

Fairly easy to do with a MPU-6050 3-axis gyroscope module plus an Arduino. Mine displays a resolution of 1 deg as that will be enough for my dish when I get it up, but simple enough to arrange for a precision of 0.1 deg.

Martin/


On 28/10/20 5:51 PM, Chris G0WUS wrote:

One with a feedback position sensor even better can then knock up a pic / arduino controller with deg display

Chris G0WUS

On 28/10/2020 17:02, Neil Smith G4DBN wrote:

You can just use a bit of coarse threaded bar as an elevation drive, with a large pulley on the end and a long string, with a bit of Delrin or PTFE as the nut.  However, there are plenty of little actuators with a 2 or 4 inch stroke, which weigh less than a pound and cost around £22. You only need a fraction of the power of those to elevate a small dish.

Neil G4DBN




Re: 10Ghz last night

Neil Smith G4DBN
 

For terrestrial, it is rare to need to move more than a degree, so it's a bit of a stretch getting a sensor to give a sensible answer, especially on an unguyed mast. I rarely look at mine, I just ride the horizon noise, keeping the noise 2-3dB down on full ground noise. I have a horizon at 0.6 degrees to the north and 0.5 to the east. Then I peak up for best S/N ratio.

Main reason I fitted a really long (18 inch) actuator was so I could always reach the sun and moon, but the next one will have a much smaller range and move faster, so it will respond much more rapidly to tweaks of the vertical position control, and allow real-time plane tracking in elevation as well as azimuth

Neil G4DBN

On 28/10/2020 17:51, Chris G0WUS wrote:

One with a feedback position sensor even better can then knock up a pic / arduino controller with deg display

Chris G0WUS

On 28/10/2020 17:02, Neil Smith G4DBN wrote:

You can just use a bit of coarse threaded bar as an elevation drive, with a large pulley on the end and a long string, with a bit of Delrin or PTFE as the nut.  However, there are plenty of little actuators with a 2 or 4 inch stroke, which weigh less than a pound and cost around £22. You only need a fraction of the power of those to elevate a small dish.


Re: 10Ghz last night

Chris G0WUS
 

One with a feedback position sensor even better can then knock up a pic / arduino controller with deg display

Chris G0WUS

On 28/10/2020 17:02, Neil Smith G4DBN wrote:

You can just use a bit of coarse threaded bar as an elevation drive, with a large pulley on the end and a long string, with a bit of Delrin or PTFE as the nut.  However, there are plenty of little actuators with a 2 or 4 inch stroke, which weigh less than a pound and cost around £22. You only need a fraction of the power of those to elevate a small dish.

Neil G4DBN



Re: 10Ghz last night

Chris G0WUS
 

you want a hook and stick like the window openers lol

Chris

pulleys and string fine works perfect light weight to

On 28/10/2020 16:44, militaryoperator via groups.io wrote:
Ben most use a linear actuator to push the bottom of the dish out wards
Chris G0WUS


-----------------------

Yes Chris, I know, great if your dish is on a tower or well guyed mast. 

Mine will be on the top pole of a 5/7mtr push up mast (should really fit new O rings) so has to be light, hi.


Nowt wrong with string!!

Ben 



Re: Attenuator wanted

Robin Szemeti - G1YFG
 

Parfait mon ami, je vais l'acheter. Aussi le 218  3db dessus. Vous acceptez PayPal?


On Wed, 28 Oct 2020 at 17:18, f1ghb <f1ghb@...> wrote:
Hello Robin

I have one attenuator MIDWEST  MOD 218 - 30 dB 12,4 Ghz 2W for sale

See a picture here :

http://millimeterwave.free.fr/Nouveautes_F.htm

Best 73s
Eric

Le 28/10/2020 18:14, Robin Szemeti - G1YFG a écrit :
Before I cast myself on the mercies and vagaries of Ebay, does anyone have a 30dB N type attenuator of "measurement quality" they would wish to sell? I picked up a second power head for the HP435, of the ridiculously sensitive variety ... a 30dB attenuator would increase it's utility ...

--
Best regards,

Robin Szemeti



--
Robin Szemeti - G1YFG


--
Robin Szemeti - G1YFG

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