Date   

Re: Reports and News for DUBUS 4/2030

Neil Smith G4DBN
 

https://www.dropbox.com/s/6gusksmazh7wmyy/DUBUS412w.pdf


On 20/10/2020 15:10, Andy wrote:
is this them or me?
Both. There's a link on the DUBUS home page to report errors. 

Essentially clicking the link is trying to open the contents into a frame but the security policy for the page doesn't allow that. Open it in a new window and it will work.

73
Andy


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of militaryoperator via groups.io <Military1944@...>
Sent: Tuesday, October 20, 2020 6:58 AM
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Reports and News for DUBUS 4/2030
 
Subject: [UKMicrowaves] Reports and News for DUBUS 4/2030

My deadline for the DUBUS European Microwave column is rapidly
approaching. I have received a number of reports already about the tropo
opening in September, more would of course be welcome, plus any other
news and photos for the column.

More details of DUBUS can be found here:


73

John G3XDY



Went to look at the sample, thought dated, copy and got:

www.dropbox.com refused to connect.

is this them or me?

Ben
-- 
Neil
http://g4dbn.uk


Re: Reports and News for DUBUS 4/2030

Andy
 

is this them or me?
Both. There's a link on the DUBUS home page to report errors. 

Essentially clicking the link is trying to open the contents into a frame but the security policy for the page doesn't allow that. Open it in a new window and it will work.

73
Andy


From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> on behalf of militaryoperator via groups.io <Military1944@...>
Sent: Tuesday, October 20, 2020 6:58 AM
To: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Subject: Re: [UKMicrowaves] Reports and News for DUBUS 4/2030
 
Subject: [UKMicrowaves] Reports and News for DUBUS 4/2030

My deadline for the DUBUS European Microwave column is rapidly
approaching. I have received a number of reports already about the tropo
opening in September, more would of course be welcome, plus any other
news and photos for the column.

More details of DUBUS can be found here:


73

John G3XDY



Went to look at the sample, thought dated, copy and got:

www.dropbox.com refused to connect.

is this them or me?

Ben


Re: Reports and News for DUBUS 4/2030

militaryoperator
 

Subject: [UKMicrowaves] Reports and News for DUBUS 4/2030

My deadline for the DUBUS European Microwave column is rapidly
approaching. I have received a number of reports already about the tropo
opening in September, more would of course be welcome, plus any other
news and photos for the column.

More details of DUBUS can be found here:


73

John G3XDY



Went to look at the sample, thought dated, copy and got:

www.dropbox.com refused to connect.

is this them or me?

Ben


Reports and News for DUBUS 4/2030

John Quarmby
 

My deadline for the DUBUS European Microwave column is rapidly approaching. I have received a number of reports already about the tropo opening in September, more would of course be welcome, plus any other news and photos for the column.

More details of DUBUS can be found here:

http://www.dubus.org/

73

John G3XDY



--
This email has been checked for viruses by Avast antivirus software.
https://www.avast.com/antivirus


Re: Do I need any Heat Sink compound on these mating surfaces.

militaryoperator
 

To the others waiting for a spreader: apologies, as I am still waiting for raw material, my guy went on holiday but is rumoured to be back today, the joys of living in the sticks!  3 have gone out, more will follow as soon as I can pick up a slab of copper, apologies to those still waiting.
Robin Szemeti - G1YFG




On a related topic, did those noise boards ever materialize Robin? 

Ben


Re: Do I need any Heat Sink compound on these mating surfaces.

Robin Szemeti - G1YFG
 

A little heatsink compound would be good, the machined surface is not bad, but will benefit from some gap filling, at the microscopic level.  If you have some CPU style compound, I'd use that under the transistors, and I'd probably just use the plain old white stuff under the copper/aluminium as the cpu past can be a bit "stiff" and you may have trouble compressing it down over a larger area. The white stuff is also cheaper.  You've done a good job with the cleanup that's for sure!

To the others waiting for a spreader: apologies, as I am still waiting for raw material, my guy went on holiday but is rumoured to be back today, the joys of living in the sticks!  3 have gone out, more will follow as soon as I can pick up a slab of copper, apologies to those still waiting.



On Tue, 20 Oct 2020 at 10:41, Nick Gregory G0HIK via groups.io <nickg0hik=googlemail.com@groups.io> wrote:
Sorry for the Newbie question :)

I'm a bit paranoid as I've let the "Magic Smoke" out of microwave projects in the past.

I've deburred everything and polished with fine wire wool and Brasso to get the best matting surfaces. I've not used a heat spreader before. I know that I dont use Heatsink compound on the copper to aluminium faces. But what about the transistor ? They seemed to have the remnants of compound on them when they arrived.
I guess if I do it's not the usual stuff,  is there something called Artic Ice available from the local PC store for Overclockers ?

Thanks

Nick G0HIK


--
Robin Szemeti - G1YFG


Do I need any Heat Sink compound on these mating surfaces.

Nick Gregory G0HIK
 

Sorry for the Newbie question :)

I'm a bit paranoid as I've let the "Magic Smoke" out of microwave projects in the past.

I've deburred everything and polished with fine wire wool and Brasso to get the best matting surfaces. I've not used a heat spreader before. I know that I dont use Heatsink compound on the copper to aluminium faces. But what about the transistor ? They seemed to have the remnants of compound on them when they arrived.
I guess if I do it's not the usual stuff,  is there something called Artic Ice available from the local PC store for Overclockers ?

Thanks

Nick G0HIK


Re: UKuG RDDS Synthesiser Kit

Adrian G4UVZ
 

I too get confused on if private messages have actually have flown!  However your has arrived and I have emailed you back ...Adrian


Re: UKuG RDDS Synthesiser Kit

Dave
 

Adrian, I tried to send a private message to you but can’t seem to send it to your email. Perhaps you could confirm this for me.
73 ,
David G4GLT.


On 19 Oct 2020, at 22:59, Gordon REASON via groups.io <gordonj.reason@...> wrote:

 What ?

On 19 October 2020 at 22:56 "Adrian G4UVZ via groups.io" <adrianwhatmore248@...> wrote:

I wonder if anyone has one of these in their bottom draw?

Looking to ugrade 10GHz beacon ..sadly G8 ACE no longer has any of these in stock!

Adrian

 


Re: UKuG RDDS Synthesiser Kit

Gordon REASON <gordonj.reason@...>
 

What ?

On 19 October 2020 at 22:56 "Adrian G4UVZ via groups.io" <adrianwhatmore248@...> wrote:

I wonder if anyone has one of these in their bottom draw?

Looking to ugrade 10GHz beacon ..sadly G8 ACE no longer has any of these in stock!

Adrian

 


UKuG RDDS Synthesiser Kit

Adrian G4UVZ
 

I wonder if anyone has one of these in their bottom draw?

Looking to ugrade 10GHz beacon ..sadly G8 ACE no longer has any of these in stock!

Adrian


Wanted 24GHz rig

Clive Elliott GW4MBS
 

Looking to get back on the band again after a gap of 40 years.

Anyone got any equipment they no longer need please?

My original narrow band WG20 has long since gone. Never really exploited the band, it was so restrictive having to have Home Office clearance for a site & limited to 5w ERP. It gave little chance of spontaneous activity, but things have changed a bit now I believe.
--
Clive GW4MBS (ex-G8ADP)
Pottering on 6m - 3cm in a valley in IO71XW where any QSO is a triumph of optimism over geography!


Re: 3cm and 6cm dualband feed.

john pieniadz <johnak4mw@...>
 

Alan:  I agree with your big bang fact, God ,Selah "think on this thing" You say nothing in the cloud!  I know you are talking about internet. But He will be returning in the clouds..
 73 john AK4MW

Can you make a tapered slot SWA array? intechopen.com

On Mon, Oct 19, 2020 at 1:02 AM Alan Beard <beardal@...> wrote:
Hi guys,

Well, I built it, double size to get to 1.3 GHz where I want it.

The feed balun is just a short piece of 50 ohm coax in a box underneath
going to a BNC socket.

Analysis with a PocketVNA.

Any comments?

Alan VK2ZIW

Yes it radiates but the Return Loss is horrible.

On Sun, 11 Oct 2020 06:44:47 +1000, Alan Beard wrote
>
>

>
>

> > And we could get quite a discussion going on just where the phase center is.
>
>

> Isn't this what their antenna is designed for, the phase centre being as close as
> possible over a wide range of frequency for radar?
>
>

> Back to my suggestion re feed, actually to make it very easy to build.
>
>

> Alan VK2ZIW 
>
>

>
>
On Fri, 9 Oct 2020 21:30:14 +0000 (UTC), KENT BRITAIN wrote

> > That is an Ultra Wideband Loop antenna.  Been around for quite some time.
> > Even that paper is 9 years old.
> >
> > Note that the SWR is plotted in both frequency and Nano Seconds.
> >
> > I'm not saying you cannot make it into a dish feed, but it would take a lot of work.
> > Reflector spacing that works for 6 cm would be a poor choice for 3 cm.
> > And we could get quite a discussion going on just where the phase center is.
> >
> > Several simpler choices that are already 50 Ohm match over a broad range of
> > frequencies.        Kent WA5VJB/2E0VAA/G8EMY
> >
> > On Friday, October 9, 2020, 4:12:54 PM CDT, Alan Beard <beardal@...> wrote:
> >
> > Have you seen this, the Shorted Bow Tie?
> >
> > https://core.ac.uk/download/pdf/70589636.pdf
> >

> > Now, note the back plane, could it be a Corner Reflector?
> >

> > As, I'm not short of "space" as in the medical use of this antenna type,
> > a 90 deg corner with the petals coming out at 60 deg ie. 15 deg off the sides.
> >

> > Next, the balun. (Why?)
> >

> > With thin coax, 1/8 in. hardline, come through the backplane and wrap it around the centreline
> > of the petal down to it's tip where the outer is soldered onto it's petal and the inner goes to the
> > tip of the other petal. 

> >

> > Ah, these antenna gurus miss the obvious.
> >

> > The feed impedance, this is a bit confusing, one article, around 30 ohms balanced feed, the other,  2x 50 ohms
> > with the petals modified wider rounded at the tip.
> >

> > Any thoughts?
> >

> > Alan VK2ZIW
> >

> > On Wed, 07 Oct 2020 23:23:05 -0700, Daniel DL3IAE wrote
> ... and if you switch both coaxial relays together, isolation is not a problem.
> Requires just a single sequenzer.
>
> Daniel
>
> ---------------------------------------------------
> Alan VK2ZIW
>
> OpenWebMail 2.53, nothing in the cloud.
>
>

---------------------------------------------------
Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.


Re: 3cm and 6cm dualband feed.

Alan Beard
 

Hi guys,

Well, I built it, double size to get to 1.3 GHz where I want it.

The feed balun is just a short piece of 50 ohm coax in a box underneath
going to a BNC socket.

Analysis with a PocketVNA.

Any comments?

Alan VK2ZIW

Yes it radiates but the Return Loss is horrible.

On Sun, 11 Oct 2020 06:44:47 +1000, Alan Beard wrote
>
>

>
>

> > And we could get quite a discussion going on just where the phase center is.
>
>

> Isn't this what their antenna is designed for, the phase centre being as close as
> possible over a wide range of frequency for radar?
>
>

> Back to my suggestion re feed, actually to make it very easy to build.
>
>

> Alan VK2ZIW 
>
>

>
>
On Fri, 9 Oct 2020 21:30:14 +0000 (UTC), KENT BRITAIN wrote

> > That is an Ultra Wideband Loop antenna.  Been around for quite some time.
> > Even that paper is 9 years old.
> >
> > Note that the SWR is plotted in both frequency and Nano Seconds.
> >
> > I'm not saying you cannot make it into a dish feed, but it would take a lot of work.
> > Reflector spacing that works for 6 cm would be a poor choice for 3 cm.
> > And we could get quite a discussion going on just where the phase center is.
> >
> > Several simpler choices that are already 50 Ohm match over a broad range of
> > frequencies.        Kent WA5VJB/2E0VAA/G8EMY
> >
> > On Friday, October 9, 2020, 4:12:54 PM CDT, Alan Beard <beardal@...> wrote:
> >
> > Have you seen this, the Shorted Bow Tie?
> >
> > https://core.ac.uk/download/pdf/70589636.pdf
> >

> > Now, note the back plane, could it be a Corner Reflector?
> >

> > As, I'm not short of "space" as in the medical use of this antenna type,
> > a 90 deg corner with the petals coming out at 60 deg ie. 15 deg off the sides.
> >

> > Next, the balun. (Why?)
> >

> > With thin coax, 1/8 in. hardline, come through the backplane and wrap it around the centreline
> > of the petal down to it's tip where the outer is soldered onto it's petal and the inner goes to the
> > tip of the other petal. 

> >

> > Ah, these antenna gurus miss the obvious.
> >

> > The feed impedance, this is a bit confusing, one article, around 30 ohms balanced feed, the other,  2x 50 ohms
> > with the petals modified wider rounded at the tip.
> >

> > Any thoughts?
> >

> > Alan VK2ZIW
> >

> > On Wed, 07 Oct 2020 23:23:05 -0700, Daniel DL3IAE wrote
> ... and if you switch both coaxial relays together, isolation is not a problem.
> Requires just a single sequenzer.
>
> Daniel
>
> ---------------------------------------------------
> Alan VK2ZIW
>
> OpenWebMail 2.53, nothing in the cloud.
>
>

---------------------------------------------------
Alan VK2ZIW
Before the Big Bang, God, Sela.
OpenWebMail 2.53, nothing in the cloud.


Re: Silly Things To Do on 10 GHz

Paul Randall G3NJV
 

..... "Escape room" ... obviously not what first came to mind if you were in there "with the wife" ...

My friend has a fully kitted out garden shed which sometimes emits Morse code noises - he calls that his escape room.



Sent from my Samsung Galaxy smartphone.



-------- Original message --------
From: Neil Smith G4DBN <neil@...>
Date: 17/10/2020 22:43 (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Silly Things To Do on 10 GHz

GB3KBQ just rose out of the noise, but it is still at ESP level. Still, not bad at 340 km.

I have zero idea what an "escape room" is. Suppose I should google it.

Neil G4DBN

On 17/10/2020 21:53, Chris G0WUS wrote:
Could probo have a game of naughts and crosses maybe via now cop.

Radio came in handy tonight was on the 4th escapse room with the wife and one of the clues was written in morse and they gave you a look up chart for the non morse people anyway did it fast well maybe slightly slower when looking at page of dots and dashes then actually listening to it but got the code in record time. The woman in charge said how did you crack the code so fast!!! Means not many hams do escape rooms lol



Re: Silly Things To Do on 10 GHz

Neil Smith G4DBN
 

GB3KBQ just rose out of the noise, but it is still at ESP level. Still, not bad at 340 km.

I have zero idea what an "escape room" is. Suppose I should google it.

Neil G4DBN

On 17/10/2020 21:53, Chris G0WUS wrote:
Could probo have a game of naughts and crosses maybe via now cop.

Radio came in handy tonight was on the 4th escapse room with the wife and one of the clues was written in morse and they gave you a look up chart for the non morse people anyway did it fast well maybe slightly slower when looking at page of dots and dashes then actually listening to it but got the code in record time. The woman in charge said how did you crack the code so fast!!! Means not many hams do escape rooms lol



Re: Silly Things To Do on 10 GHz

Chris G0WUS
 

Could probo have a game of naughts and crosses maybe via now cop.

Radio came in handy tonight was on the 4th escapse room with the wife and one of the clues was written in morse and they gave you a look up chart for the non morse people anyway did it fast well maybe slightly slower when looking at page of dots and dashes then actually listening to it but got the code in record time. The woman in charge said how did you crack the code so fast!!! Means not many hams do escape rooms lol

Chris G0WUS




Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: Neil Smith G4DBN <neil@...>
Date: 17/10/2020 8:40 pm (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Silly Things To Do on 10 GHz

Not much action on a Saturday night on 3cm, so after checking the usual beacons and hearing the usual suspects, FNY, CAM, OSW and PKT, but not a sniff from even the ever-faithful KBQ, I decided to send a bit of JT9F in the direction of the most excellent Mow Cop WebSDR. I set Audacity to record the sound from my Chrome session with the WebSDR, then played it back using the same Virtual Audio Cable that I normally use between the Elad FDM-SW2 SDR software and various digimode programs.

WSJT-X decoded it nicely at -8dB.

I suppose I could use the Club callsign and a bit of scripting to "work" myself via Mow Cop, rather like I did when there was decent rainscatter, good enough to allow FT8 over NBFM over 10GHz rainscatter over WebSDR, but there is a limit to the amount of silliness that I can allow myself before dissolving into fits of giggles and making the dogs uneasy.

And then there is always tonal graffiti, Pacman, cartoons or woteva.

I don't suppose anyone fancies one of those old-fashioned Kew-Ess-Ohs that used to be in vogue? It might be amusing to try a bit of JT9 or QRA64 while things are flat-but-not-horribly-absorptive. If it won't work direct, then perhaps via Mow Cop! Perhaps I'll just go and machine something...

Neil G4DBN


Re: The Denis Jones G3UVR Memorial Trophy

Chris G0WUS
 

Steve this is a superb tribute to a superb chap and many thanks for thinking of this and even more for making it happen.

73 Chris G0WUS 







Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: "steve G1PPA via groups.io" <steveturner249@...>
Date: 17/10/2020 6:31 pm (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] The Denis Jones G3UVR Memorial Trophy

i made an application for a Memorial Trophy for Denis G3UVR , i would like to thank Jacqui goody the Trophy manager and the VHFCC and ian for there help and support, iam pleased to say its been accepted, and will be presented to overall Winner of the single op section in the SHF UKAC, I hope you agree a fitting tribute to dennis, ive posted this here as some may not use FB , a few people have wanted to donate towards the trophy iam happy to pay all cost however i have set up a donation link if people feel they want to, Denis supported his local cat rescue on the Wirrel any surplus will be sent to them ,if admin allow i will post the link here or send me messege there is no obligation to anyone.
many thanks for reading 
steve
G1PPA


Silly Things To Do on 10 GHz

Neil Smith G4DBN
 

Not much action on a Saturday night on 3cm, so after checking the usual beacons and hearing the usual suspects, FNY, CAM, OSW and PKT, but not a sniff from even the ever-faithful KBQ, I decided to send a bit of JT9F in the direction of the most excellent Mow Cop WebSDR. I set Audacity to record the sound from my Chrome session with the WebSDR, then played it back using the same Virtual Audio Cable that I normally use between the Elad FDM-SW2 SDR software and various digimode programs.

WSJT-X decoded it nicely at -8dB.

I suppose I could use the Club callsign and a bit of scripting to "work" myself via Mow Cop, rather like I did when there was decent rainscatter, good enough to allow FT8 over NBFM over 10GHz rainscatter over WebSDR, but there is a limit to the amount of silliness that I can allow myself before dissolving into fits of giggles and making the dogs uneasy.

And then there is always tonal graffiti, Pacman, cartoons or woteva.

I don't suppose anyone fancies one of those old-fashioned Kew-Ess-Ohs that used to be in vogue? It might be amusing to try a bit of JT9 or QRA64 while things are flat-but-not-horribly-absorptive. If it won't work direct, then perhaps via Mow Cop! Perhaps I'll just go and machine something...

Neil G4DBN


Re: Activity List for the UK Microwave Group 24/47/76GHz Contests - Sunday 18th October

Barry Lewis
 

Adding:
Callsign: G4SJH/P
Locator: IO91JH Cheesefoot Hd from around 09:30 then to C Gibbet IO91GI
Bands: 24GHz
Talkback: 144.390MHz, KST

4101 - 4120 of 62912