Date   

Re: Wimo 23cms 44ele [1 Attachment]

Rex Cameron <cathar.gnostic@...>
 

Yes but much better, really excites the parasitic elements and due to the length diameter ratio its much more broad banded. I dumped every other dipole design because I could not get 1:1.

ZL4IV



Re: Wednesday night 23cm Digifest

Neil Smith G4DBN
 

...and I’m in Slough.  Not quite as exotic, but still a long way from my radios.
Neil G4DBN

On 16 Nov 2016, at 12:31, m0afj m0afj@... [ukmicrowaves] <ukmicrowaves@...> wrote:


Sorry, im in Munich this week



Best Regards 
Tim Hague M0AFJ
07930-409145



-------- Original message --------
From: "'Mark G0MGX' mark.g0mgx@... [ukmicrowaves]" <ukmicrowaves@...> 
Date: 08/11/2016 03:24 (GMT+01:00)
Subject: RE: [ukmicrowaves] Wednesday night 23cm Digifest 

 

Unfortunately I’m working in Dubai this week so no signals from me.

 

Mark

G0MGX

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...] 
Sent: 08 November 2016 03:43
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Wednesday night 23cm Digifest

 

  

Certainly be interesting to compare ISCAT-A/B with MSK144 for aircraft scatter.  The off-axis path approach using the Heathrow western glide path as a common volume for scattering will also be worth another look. 

Neil G4DBN

 

On 7 Nov 2016, at 22:21, Sam Jewell jewell@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

 

Maybe we can add MSK144/ 15 second to that list this time?

Looks like it might be interesting with AR

73 de Sam, G4DDK



Sent tomorrow from my time machine

 


On 7 Nov 2016, at 22:15, g4bao john@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

 

Hi all,

I'd like to organise another Wednesday night "Digifest" this week form around 1930 on and around 1296.165.
 

I'll be QRV using JT4F on 1296.165 running 350Watts and beaming various directions and lighting up the Heathrow stack for aircraft Scatter. I would welcome callers. 

Hopefully we can get G4DDK, G0MGX, G4DBN and G4KVT to come on again to kick things off.
  

We get together to liaise on ON4KST and experiment with various JT modes and aircraft scatter.

See you Wednesday!
 

73

John G4BAO


   

 

 

 





Re: Wimo 23cms 44ele [1 Attachment]

ian hope (2E0IJH)
 

So a a coaxial dipole like G4CQM type antennas?
 
Ian
2E0IJH

 
Sent: Wednesday, November 16, 2016 at 7:34 PM
From: "Rex Cameron cathar.gnostic@... [ukmicrowaves]"
To: "ukmicrowaves@..."
Subject: RE: [ukmicrowaves] Wimo 23cms 44ele [1 Attachment]
 
[Attachment(s) from Rex Cameron included below]

 

This is my version of the perfect driven element for my 32el yagi. Tried all designs but only this one works at +200w and at SWR 1:1.
It's been in use for a number of years with my regular evening ragchew at a distance of about 300km.
 
ZL4IV
 
 

 


Re: Wimo 23cms 44ele

Rex Cameron <cathar.gnostic@...>
 

This is my version of the perfect driven element for my 32el yagi. Tried all designs but only this one works at +200w and at SWR 1:1.
It's been in use for a number of years with my regular evening ragchew at a distance of about 300km.

ZL4IV



432 and Above EME Newsletter for November 2016

rein0zn@...
 

Hello All,

The 432 MHz and Above EME Newsletter for November 2016 by K2UYH can be downloaded from:

http://www.nitehawk.com/rasmit/em70cm.html

-- Enjoy

-- Tnx Al.

73 Rein W6SZ


Re: Tripod turntable [1 Attachment]

geoff Blake
 

Thanks Mike, I can see it now - a microwavers queue outside B&Q.

Geoff

#################################################
Geoff Blake,   G8GNZ    JO01fq:   Chelmsford,  Essex,  UK
<geoff@...>    or   <melecerties@...>
Using Linux: Ubuntu 14.04 on Intel or Debian on UltraSparc
    and  Apple  OS  X  El Capitan  on  my  Macbook  Pro.    
                Avoiding Micro$oft like the plague.
#################################################

On 16 November 2016 at 14:09, mb.golfmad@... [ukmicrowaves] <ukmicrowaves@...> wrote:
[Attachment(s) from mb.golfmad@... [ukmicrowaves] included below]

Hi Geoff,

Your wish is my command!!

cheers

Mike G6TRM



Re: Tripod turntable [1 Attachment]

Pete - GM4BYF
 

Mike
A very useful lead.
I have discovered that if you look up “Lazy Susan Turntables” on eBay, they come in all sorts of sizes.
The six inch is rated at 227kg and the twelve inch at more than 300kg. Think that may be the basis of my dish system which I wish to set up for EME .
73
Pete GM4BYF
 

From: mb.golfmad@... [ukmicrowaves]
Sent: Wednesday, November 16, 2016 2:09 PM
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Tripod turntable [1 Attachment]
 
 

Hi Geoff,

Your wish is my command!!

cheers

Mike G6TRM


Re: Wimo 23cms 44ele

John Lemay
 

Phil

 

You are correct. I was on ‘KST when you raised the issue and you got a quick reply which at the time I assumed was right. But I have an old driven element here, minus it’s plastic case and “sticky stuff”, and it must be like yours – open circuit to DC.

 

I used to run a pair of 44 ele’s and over time I decided that the VSWR was getting higher, and took one apart to see if I could understand why. I’m none the wiser having done so. Measured at the feed point, it was about 1.4 to 1.

 

John G4ZTR

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Wednesday, November 16, 2016 14:11
To: ukmicrowaves@...
Subject: [ukmicrowaves] Wimo 23cms 44ele

 

 

I had a classic fright on Sunday when I convinced myself the yagi was misbehaving. 

I thought the driven element was supposed to be short circuit to DC, as did others. 

However on dismantling I can confirm its very well made - or in my case, was - and intentionally 

open circuit.

 

Phil 'YPQ


Wimo 23cms 44ele

g3ypq
 

I had a classic fright on Sunday when I convinced myself the yagi was misbehaving. 

I thought the driven element was supposed to be short circuit to DC, as did others. 

However on dismantling I can confirm its very well made - or in my case, was - and intentionally 

open circuit.


Phil 'YPQ


Re: Tripod turntable

mike G6TRM
 

Hi Geoff,

Your wish is my command!!

cheers

Mike G6TRM


Re: Tripod turntable

Pete - GM4BYF
 

Excellent idea Mike.
Looks like a trip to B&Q in the offing.
73
Pete GM4BYF
 

From: mb.golfmad@... [ukmicrowaves]
Sent: Wednesday, November 16, 2016 1:33 PM
To: ukmicrowaves@...
Subject: [ukmicrowaves] Tripod turntable
 
 

 

Hi All,
I have found something that I hope may prove useful to other portable microwavers....

Like many others I use surveyor tripods as my primary means of supporting my 10Ghz/24Ghz equipment.
a continuing problem has been trying to find a strong and reliable method to rotate the gear to enable a change of heading.
I have tried camera mounts and found them either too expensive, not strong/big enough and many had too much slop/play in the bearing to supporting the gear and a dish properly.

Today I  found a "360deg Heavy Duty TV Swivel" in B&Q for £3 that could be suitable..It looks to be well made, no slop and with a small amount of effort, should be easy to fit to the tripod. It consists of 2 steel plates, 2mm x155mm square with a 120mm circular track using 16  6mm ball bearings. Clamped together with a central "rivet" that has a 10mm hole.
I am yet to try it, but for £3, if it works, has got to be in the running for bargain of the year!!

regards,

Mike G6TRM



Re: Tripod turntable

geoff Blake
 

Any chance of a photo Mike?

Geoff

#################################################
Geoff Blake,   G8GNZ    JO01fq:   Chelmsford,  Essex,  UK
<geoff@...>    or   <melecerties@...>
Using Linux: Ubuntu 14.04 on Intel or Debian on UltraSparc
    and  Apple  OS  X  El Capitan  on  my  Macbook  Pro.    
                Avoiding Micro$oft like the plague.
#################################################

On 16 November 2016 at 13:29, mb.golfmad@... [ukmicrowaves] <ukmicrowaves@...> wrote:


Hi All,
I have found something that I hope may prove useful to other portable microwavers....

Like many others I use surveyor tripods as my primary means of supporting my 10Ghz/24Ghz equipment.
a continuing problem has been trying to find a strong and reliable method to rotate the gear to enable a change of heading.
I have tried camera mounts and found them either too expensive, not strong/big enough and many had too much slop/play in the bearing to supporting the gear and a dish properly.

Today I  found a "360deg Heavy Duty TV Swivel" in B&Q for £3 that could be suitable..It looks to be well made, no slop and with a small amount of effort, should be easy to fit to the tripod. It consists of 2 steel plates, 2mm x155mm with a 120mm circular track using 16  6mm ball bearings. Clamped together with a central "rivet" that has a 10mm hole.
I am yet to try it, but for £3, if it works, has got to be in the running for bargain of the year!!

regards,

Mike G6TRM



Tripod turntable

mike G6TRM
 


Hi All,
I have found something that I hope may prove useful to other portable microwavers....

Like many others I use surveyor tripods as my primary means of supporting my 10Ghz/24Ghz equipment.
a continuing problem has been trying to find a strong and reliable method to rotate the gear to enable a change of heading.
I have tried camera mounts and found them either too expensive, not strong/big enough and many had too much slop/play in the bearing to supporting the gear and a dish properly.

Today I  found a "360deg Heavy Duty TV Swivel" in B&Q for £3 that could be suitable..It looks to be well made, no slop and with a small amount of effort, should be easy to fit to the tripod. It consists of 2 steel plates, 2mm x155mm square with a 120mm circular track using 16  6mm ball bearings. Clamped together with a central "rivet" that has a 10mm hole.
I am yet to try it, but for £3, if it works, has got to be in the running for bargain of the year!!

regards,

Mike G6TRM



Re: Wednesday night 23cm Digifest

Tim Hague M0AFJ
 

Sorry, im in Munich this week



Best Regards 
Tim Hague M0AFJ
m0afj@... 
07930-409145



-------- Original message --------
From: "'Mark G0MGX' mark.g0mgx@... [ukmicrowaves]" <ukmicrowaves@...>
Date: 08/11/2016 03:24 (GMT+01:00)
To: ukmicrowaves@...
Subject: RE: [ukmicrowaves] Wednesday night 23cm Digifest

 

Unfortunately I’m working in Dubai this week so no signals from me.

 

Mark

G0MGX

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 08 November 2016 03:43
To: ukmicrowaves@...
Subject: Re: [ukmicrowaves] Wednesday night 23cm Digifest

 

 

Certainly be interesting to compare ISCAT-A/B with MSK144 for aircraft scatter.  The off-axis path approach using the Heathrow western glide path as a common volume for scattering will also be worth another look. 

Neil G4DBN

 

On 7 Nov 2016, at 22:21, Sam Jewell jewell@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

 

Maybe we can add MSK144/ 15 second to that list this time?

Looks like it might be interesting with AR

73 de Sam, G4DDK



Sent tomorrow from my time machine

 


On 7 Nov 2016, at 22:15, g4bao john@... [ukmicrowaves] <ukmicrowaves@...> wrote:

 

 

Hi all,

I'd like to organise another Wednesday night "Digifest" this week form around 1930 on and around 1296.165.
 

I'll be QRV using JT4F on 1296.165 running 350Watts and beaming various directions and lighting up the Heathrow stack for aircraft Scatter. I would welcome callers. 

Hopefully we can get G4DDK, G0MGX, G4DBN and G4KVT to come on again to kick things off.
  

We get together to liaise on ON4KST and experiment with various JT modes and aircraft scatter.

See you Wednesday!
 

73

John G4BAO


   

 

 

 


Re: Length of 2m feeder to Sg Labs transverter

ian hope (2E0IJH)
 

Yes we've had creeping centres with many contest cable, Not seem to be issue now have changed to crimp plugs, but time will tell, will be a PA in there in the future, Have had conversations with Bert PE1RKI, Prob run something like 4mm Sq supply tails, Have suitable Large Ip rated boxes, as use them in trade (Electrical Engineer)
 
Ian
2E0IJH

 
Sent: Tuesday, November 15, 2016 at 12:16 PM
From: "'Tony Collett' anthony.collett@... [ukmicrowaves]"
To: ukmicrowaves@...
Subject: RE: [ukmicrowaves] Length of 2m feeder to Sg Labs transverter
 

 

I like Peter’s comment re cable type – you’ve already seen the creeping centre conductor issue I think Ian?

 

My comment was a bit “in cheek” but realistically so long as the loss in the cable is less than the gain of the transverter on Rx you will be OK, you only need a small increase in noise on the 2m Rx when the transverter is connected (use too much gain and you risk reducing your dynamic range though not likely to be much of an issue for you?).

Likewise on Tx, so long as you have enough power to drive it OK. I would imagine that even basic UR67/RG214 would be plenty good enough over that sort of distance but do make sure everything is protected from the weather if you want it to be reliable.

 

Another dumb comment – make sure the DC cable is capable of whatever current you might take in future without incurring voltage drooping on speech peaks. Hardly a problem for the basic transverter but if you add a PA??

 

Look forward to working you in due course.

73

Tony G4NBS

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Tuesday, November 15, 2016 07:35
To: ukmicrowaves@...
Subject: RE: [ukmicrowaves] Length of 2m feeder to Sg Labs transverter

 

 

Ian

Both John and Tony have given you correct answers.

 

Of 9913 contra LMR-400 I would suggest that the LMR-400 is a slightly better choice as the longitudinal air dielectric volume of 9913 will slowly absorb moisture from the outside air IF it runs outside your house. Temp cycling et al.
And the centre conductor is more likely to creep downwards under the effect of gravity.

This are effects that can crawl up on your installation over the space of a year or three.

 

More germane to a successful long-term installation is the quality of the termination of the cables with correct connectors,

And sealing of the transitions/joints..

 

 

Peter Ebsworth,

Forland, Sotra.


From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 14. november 2016 21:41
To: ukmicrowaves@...; g.suggateyahoo.com rsgbtech
Subject: [ukmicrowaves] Length of 2m feeder to Sg Labs transverter

 

 

Hi all what would be a acceptable length of feeder at 2m (146mhz) be for a mast head mounted SG labs transverter and still get a acceptable performance.

 

Planing the Masthead setup, have extended the the 2 Control LEDS onto a cable so can monitor the unit at shack

 

Ian

2E0IJH

 

 


Re: Steel box section masts

Dave G8KHU
 

You can get 50x50x3 and 80x80x3 galvanized from metals4U in 6m lengths, but I can't see 60x60x3 box there.

https://www.metals4u.co.uk/mild-steel/galvanised/box-section/80mm-x-80mm-x-3mm/p13633

Be aware of the weight though, a rough estimate of the weight of 6m of 50x50x3 is 29kg and for the 80x80x3 is 46kg. Raising and lowering that with antennas as well isn't something to be taken lightly (excuse pun) from a safety perspective.

Eddie's suggestion of the rotator at the bottom is well worth considering as it puts the rotator weight at the bottom and means that the rotating part of the feeders are at the bottom of the mast also where they can easily be accessed in the event of problems.

Coincidently I'm just in the process of revamping my permanent scaffold pole mast and have relocated the rotator to the bottom for the same reasons. I've attached a picture which may be of interest. The left hand pole is steel and is sunk into concrete, the centre pole (also steel) is sunk into the concrete also and is hinged at the bottom. This pole carries the rotator and two thrust bearings and clams to the left hand pole by scaffold clamps when raised. The right hand pole is the mast itself and here I've gone for aluminium to minimise weight. If any of that's of interest feel free to plagiarise :)

Dave

G8KHU


 


Re: Length of 2m feeder to Sg Labs transverter

Tony G4NBS
 

I like Peter’s comment re cable type – you’ve already seen the creeping centre conductor issue I think Ian?

 

My comment was a bit “in cheek” but realistically so long as the loss in the cable is less than the gain of the transverter on Rx you will be OK, you only need a small increase in noise on the 2m Rx when the transverter is connected (use too much gain and you risk reducing your dynamic range though not likely to be much of an issue for you?).

Likewise on Tx, so long as you have enough power to drive it OK. I would imagine that even basic UR67/RG214 would be plenty good enough over that sort of distance but do make sure everything is protected from the weather if you want it to be reliable.

 

Another dumb comment – make sure the DC cable is capable of whatever current you might take in future without incurring voltage drooping on speech peaks. Hardly a problem for the basic transverter but if you add a PA??

 

Look forward to working you in due course.

73

Tony G4NBS

 

From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: Tuesday, November 15, 2016 07:35
To: ukmicrowaves@...
Subject: RE: [ukmicrowaves] Length of 2m feeder to Sg Labs transverter

 

 

Ian

Both John and Tony have given you correct answers.

 

Of 9913 contra LMR-400 I would suggest that the LMR-400 is a slightly better choice as the longitudinal air dielectric volume of 9913 will slowly absorb moisture from the outside air IF it runs outside your house. Temp cycling et al.
And the centre conductor is more likely to creep downwards under the effect of gravity.

This are effects that can crawl up on your installation over the space of a year or three.

 

More germane to a successful long-term installation is the quality of the termination of the cables with correct connectors,

And sealing of the transitions/joints..

 

 

Peter Ebsworth,

Forland, Sotra.


From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 14. november 2016 21:41
To: ukmicrowaves@...; g.suggateyahoo.com rsgbtech
Subject: [ukmicrowaves] Length of 2m feeder to Sg Labs transverter

 

 

Hi all what would be a acceptable length of feeder at 2m (146mhz) be for a mast head mounted SG labs transverter and still get a acceptable performance.

 

Planing the Masthead setup, have extended the the 2 Control LEDS onto a cable so can monitor the unit at shack

 

Ian

2E0IJH


Re: Long path

g4bao
 

I also worked LA3EQ on 23 using QRA64 last night. Jan uses a similar system to Sam and we completed easily. I have to confess that the mode takes a bit of getting used to, as for most of the QSO I couldn't even see Sam's keyed signal on the waterfall never mind hear it. It only appeared when he sent the single tone test signal. I described the experience as being "a bit Harry Potter" at the time! Cynics should note that this system uses no callsign lookup like JT65 can.
Earlier in the evening I was called by, and worked on Random JT65 EME by Rob M0DTS who was a stonking signal here!

Think you can't do EME from a small back garden? Think again.
73 John


On 15 Nov 2016 09:06, "Sam Jewell jewell@... [ukmicrowaves]" <ukmicrowaves@...> wrote:
 

Using the good conditions (lowest path loss) during last nights 'supermoon' and the new QRA64 weak signal digital mode, G4BAO and I were able to complete a QSO on 23cm off the moon. The signals were marginal at best between the 1.9/2.3m dishes with around 200W (in the shack, much less at my antenna) and didn't decode for me on every over. The great thing about QRA64 is that it is error checked, so you know from the EME path delay time, signal levels, doppler and contents that the exchange was genuine and not via tropo back scatter.
John's signals decoded on JT65C earlier when he was working LA3EQ, but were far less reliable.
We are far from being the smallest pair of stations to successfully work off the moon, but it was nevertheless the culmination of tests between John and myself going back some time.
The moon did appear later yesterday evening after the showery weather cleared the east coast. It was quite impressive to see although not as impressive as the rising moon the previous evening when driving back east from Stansted!
73 de Sam, G4DDK


Long path

SAM JEWELL
 

Using the good conditions (lowest path loss) during last nights 'supermoon' and the new QRA64 weak signal digital mode, G4BAO and I were able to complete a QSO on 23cm off the moon. The signals were marginal at best between the 1.9/2.3m dishes with around 200W (in the shack, much less at my antenna) and didn't decode for me on every over. The great thing about QRA64 is that it is error checked, so you know from the EME path delay time, signal levels, doppler and contents that the exchange was genuine and not via tropo back scatter.
John's signals decoded on JT65C earlier when he was working LA3EQ, but were far less reliable.
We are far from being the smallest pair of stations to successfully work off the moon, but it was nevertheless the culmination of tests between John and myself going back some time.
The moon did appear later yesterday evening after the showery weather cleared the east coast. It was quite impressive to see although not as impressive as the rising moon the previous evening when driving back east from Stansted!
73 de Sam, G4DDK


Re: Length of 2m feeder to Sg Labs transverter

Peter <pete-ebs@...>
 

Ian

Both John and Tony have given you correct answers.

 

Of 9913 contra LMR-400 I would suggest that the LMR-400 is a slightly better choice as the longitudinal air dielectric volume of 9913 will slowly absorb moisture from the outside air IF it runs outside your house. Temp cycling et al.
And the centre conductor is more likely to creep downwards under the effect of gravity.

This are effects that can crawl up on your installation over the space of a year or three.

 

More germane to a successful long-term installation is the quality of the termination of the cables with correct connectors,

And sealing of the transitions/joints..

 

 

Peter Ebsworth,

Forland, Sotra.


From: ukmicrowaves@... [mailto:ukmicrowaves@...]
Sent: 14. november 2016 21:41
To: ukmicrowaves@...; g.suggateyahoo.com rsgbtech
Subject: [ukmicrowaves] Length of 2m feeder to Sg Labs transverter

 

 

Hi all what would be a acceptable length of feeder at 2m (146mhz) be for a mast head mounted SG labs transverter and still get a acceptable performance.

 

Planing the Masthead setup, have extended the the 2 Control LEDS onto a cable so can monitor the unit at shack

 

Ian

2E0IJH

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