Date   

Re: DC1368 GaAs diode data

Murray Niman
 

A quick one is attached from google, but the original info will be in older MEDL data that isn't to hand at present

73

   Murray G6JYB


Re: Activity List for the UK Microwave Group 5.7GHz and 10GHz Contests - Sunday 31st July

Dave G1EHF
 

Callaign: G1EHF/P
Locator: IO91GI
Bands: 5.7GHz 15W 60cm grid dish
Talkback: ON4KST, 144.390
Times: 10am BST onwards

73, Dave G1EHF


Re: Virtual Radar Server plane feed has stopped working

Robin Szemeti - G1YFG
 

Like GLT, i would be happy to pay a subscription to have the service.


On Mon, 25 Jul 2022, 22:08 Dave via groups.io, <davidnewman55=icloud.com@groups.io> wrote:
Hello John,
I would be happy to pay a subscription to get the service.
73
Dave G4GLT. 


On 25 Jul 2022, at 21:55, John Quarmby via groups.io <g3xdy=btinternet.com@groups.io> wrote:



 Update on Airscout plane feed issue, pretty much as expected I'm afraid.

I would be happy to collate responses to Frank on those running ADS-B RXs if you wish.

73

John G3XDY



-------- Forwarded Message --------
Subject: Virtual Radar Server plane feed has stopped working
Date: Mon, 25 Jul 2022 19:59:18 +0200
From: Frank Schmähling <dl2alf@...>
To: dl2alf@...


Hi all,

 

Maybe you already know this from other sources:

 

The operators of the Virtual Radar Server plane feed had cancelled their free service to the AirScout community.
Bad news, but we are thankful for using this opportunity since many years! Now, we should face the truth that nothing is for free
without giving a return.

So everybody of the AirScout community should consider operating an ADS-B receiver (if it's legal in his country) and feeding the 
data to the ADSBExchange servers!

If you already do so, please send me an 
email. A list of all recent feeders could be a good base for negotiations.
This is the only way to get this service back! 

 

73 de Frank, DL2ALF


Virus-free. www.avast.com


--
Robin Szemeti - G1YFG


DC1368 GaAs diode data

G8FXB
 

Does anyone have data for the Marconi/AEI DC1368 GaAs detector diode (or even an actual device), please? 

Failing that, full data on any in the DC1300 series might help. 

Regards,
Graham


I hve a 10GHz test set, AP 65371A, from which aeroplane?

Alan Beard
 

Hi guys,

TEST OSCILLATOR G229

Inside, I find the power transformer input is 80VAC 1500~.

Where in Military History do we find that power?

Inside is also a CV2304 waveguide output reflex klystron 9.4 to 9.8 GHz,
a variable attenuator, a waveguide switch and a diode detector and meter.





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


Re: Virtual Radar Server plane feed has stopped working

John Quarmby
 

Thanks Dave, appreciated.

73

John G3XDY

On 26/07/2022 21:16, Dave (G1OGY) wrote:

Well! That was a faff!
Poor paths in install scripts.

Anyhow:  I am now feeding ADSBExchange; FWIW.

Dave, G1OGY


On Tue, 26 Jul 2022 at 18:51, Dave (G1OGY) <g1ogy@...> wrote:
Hello John
I already feed FR24 and planefinder.
Once I have reviewed the feed download package from adsbexchange I will consider adding them to my output.
I'll let you know...

Dave, G1OGY


On Mon, 25 Jul 2022 at 21:55, John Quarmby via groups.io <g3xdy=btinternet.com@groups.io> wrote:

 Update on Airscout plane feed issue, pretty much as expected I'm afraid.

I would be happy to collate responses to Frank on those running ADS-B RXs if you wish.

73

John G3XDY



-------- Forwarded Message --------
Subject: Virtual Radar Server plane feed has stopped working
Date: Mon, 25 Jul 2022 19:59:18 +0200
From: Frank Schmähling <dl2alf@...>
To: dl2alf@...


Hi all,

 

Maybe you already know this from other sources:

 

The operators of the Virtual Radar Server plane feed had cancelled their free service to the AirScout community.
Bad news, but we are thankful for using this opportunity since many years! Now, we should face the truth that nothing is for free
without giving a return.

So everybody of the AirScout community should consider operating an ADS-B receiver (if it's legal in his country) and feeding the 
data to the ADSBExchange servers!

If you already do so, please send me an 
email. A list of all recent feeders could be a good base for negotiations.
This is the only way to get this service back! 

 

73 de Frank, DL2ALF


Virus-free. www.avast.com


Re: Virtual Radar Server plane feed has stopped working

Dave (G1OGY)
 

Well! That was a faff!
Poor paths in install scripts.

Anyhow:  I am now feeding ADSBExchange; FWIW.

Dave, G1OGY


On Tue, 26 Jul 2022 at 18:51, Dave (G1OGY) <g1ogy@...> wrote:
Hello John
I already feed FR24 and planefinder.
Once I have reviewed the feed download package from adsbexchange I will consider adding them to my output.
I'll let you know...

Dave, G1OGY


On Mon, 25 Jul 2022 at 21:55, John Quarmby via groups.io <g3xdy=btinternet.com@groups.io> wrote:

 Update on Airscout plane feed issue, pretty much as expected I'm afraid.

I would be happy to collate responses to Frank on those running ADS-B RXs if you wish.

73

John G3XDY



-------- Forwarded Message --------
Subject: Virtual Radar Server plane feed has stopped working
Date: Mon, 25 Jul 2022 19:59:18 +0200
From: Frank Schmähling <dl2alf@...>
To: dl2alf@...


Hi all,

 

Maybe you already know this from other sources:

 

The operators of the Virtual Radar Server plane feed had cancelled their free service to the AirScout community.
Bad news, but we are thankful for using this opportunity since many years! Now, we should face the truth that nothing is for free
without giving a return.

So everybody of the AirScout community should consider operating an ADS-B receiver (if it's legal in his country) and feeding the 
data to the ADSBExchange servers!

If you already do so, please send me an 
email. A list of all recent feeders could be a good base for negotiations.
This is the only way to get this service back! 

 

73 de Frank, DL2ALF


Virus-free. www.avast.com


Re: Rotator control box.

Colin Ranson
 

Hi Dave,

 

 

Thanks for that,  working on something here.......   can control the rotator via cw/ccw switches from an Emotator control Box.    Looking to use a Magetomer/Arduino project.

 

 

Regards

 

 

Colin de G8LBS.

 

Sent from Mail for Windows

 

From: Dave_G0WBX via groups.io
Sent: 20 July 2022 21:15
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] Rotator control box.

 

I have an old AR40 rotator here still in use (at the base of the pole,
so the whole pole rotates.  Makes for easy maintenance!)
Using a home built controller.

That is just a 24V 4A transformer, the motor capacitor from the old
controller, and some ex DEC minicomputer front panel switches for CW or
CCW movement.  Wired so that one (CCW) has priority over the other, so
no unexpected overloads.

The position feedback indication, is by a simple DC constant current
source that sends 3.6mA around the loop containing the position feedback
variable resistor (1k Ohm at maximum) and a simple 3 digit DMM panel
meter.  Plus some simple analogue "frig-factor" parts for zero
adjustment, the current source is adjusted for "360" at full CW, the
Zero pot for "000" at full CCW.  Yes, they interact, but you don't need
to do it every day (or year for that matter!..)

As a result, the DMM shows 000 to 360 equating to North round (cw) to
North.   Yes, you have to have the "Stop" at North, but that is not much
of a handicap in the UK, at least for me.

It is surprisingly RF immune, despite no specific precautions taken or
designed in.

I built that over 40 years ago immediately prior to one of the September
VHF Trophy contests, after the original controller transformer suddenly
failed.   One segment of one DMM digit is a bit flaky now, but I can't
be bothered to replace it.  The LED DMM module is still made in one form
or another.  A simple ICL7106 based thing if ever "needed".

The readout compares very well with expected bearings (based on QGrid*
usage) to published locators for known beacons and such, +- 2 counts on
the display, compared to the beamwidth of a 9EL Tonna on 2m, or even a
19EL on 70cm, not a problem.
(*  http://users.telenet.be/on4qz/qgrid/index.html  )


Andy 'JNT has at least one documented project for controlling such
rotators, where AFIR you can have the "Stop" anywhere you want.  And at
least two movement speeds.   Plus perhaps some remote control ability.

In that respect, there are dozens of rotator control project designs,
and ready built products (at a cost) for full remote rotator control, if
needed, if you Google a little bit.  Many are Arduino based, with open
source firmware, and varying degrees of interfacing needed...

Yet to go that route myself.  Maybe one day.

73.

Dave G8KBV(G0WBX)



--
Created on and sent from a Unix like PC running and using free and open source software:





 


Re: Virtual Radar Server plane feed has stopped working

Dave (G1OGY)
 

Hello John
I already feed FR24 and planefinder.
Once I have reviewed the feed download package from adsbexchange I will consider adding them to my output.
I'll let you know...

Dave, G1OGY


On Mon, 25 Jul 2022 at 21:55, John Quarmby via groups.io <g3xdy=btinternet.com@groups.io> wrote:

 Update on Airscout plane feed issue, pretty much as expected I'm afraid.

I would be happy to collate responses to Frank on those running ADS-B RXs if you wish.

73

John G3XDY



-------- Forwarded Message --------
Subject: Virtual Radar Server plane feed has stopped working
Date: Mon, 25 Jul 2022 19:59:18 +0200
From: Frank Schmähling <dl2alf@...>
To: dl2alf@...


Hi all,

 

Maybe you already know this from other sources:

 

The operators of the Virtual Radar Server plane feed had cancelled their free service to the AirScout community.
Bad news, but we are thankful for using this opportunity since many years! Now, we should face the truth that nothing is for free
without giving a return.

So everybody of the AirScout community should consider operating an ADS-B receiver (if it's legal in his country) and feeding the 
data to the ADSBExchange servers!

If you already do so, please send me an 
email. A list of all recent feeders could be a good base for negotiations.
This is the only way to get this service back! 

 

73 de Frank, DL2ALF


Virus-free. www.avast.com


Re: GB3NGI

John Lemay
 

Thanks Gordon, Phil and Richard

Pleased to say that normal service seems to have resumed; 13 decodes in the last hour, with the best at -14dB. Temporary aerial, 4 x 23 ele at about 20ft.

Regards

John G4ZTR

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of Phil G4LPP
Sent: 25 July 2022 23:41
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] GB3NGI

Hearing it fine here in JO02SS, about 1 decode in 4 passes today reporting -23 to -21.

Phil G4LPP
On 25 Jul 2022, at 20:37, Gordon GI6ATZ via groups.io <gordon.curry@...> wrote:

Hi John

There was a power outage at the site over the weekend - not sure when it started (sometime mid Saturday) and power was restored yesterday morning at 10:00am so maybe that’s why you didn’t hear it. I only found out about it late Saturday night when the GSM switch reported it was running on battery.
There was a recent site visit (not by me) to reprogram the 70cms beacon and as part of that visit the beacons were to be moved onto the site genny but looks like that didn’t work out.
Will have to renegotiate another visit to get that done.

Gordon
GI6ATZ





Re: GB3NGI

Phil G4LPP
 

Hearing it fine here in JO02SS, about 1 decode in 4 passes today reporting -23 to -21.

Phil G4LPP

On 25 Jul 2022, at 20:37, Gordon GI6ATZ via groups.io <gordon.curry@...> wrote:

Hi John

There was a power outage at the site over the weekend - not sure when it started (sometime mid Saturday) and power was restored yesterday morning at 10:00am so maybe that’s why you didn’t hear it. I only found out about it late Saturday night when the GSM switch reported it was running on battery.
There was a recent site visit (not by me) to reprogram the 70cms beacon and as part of that visit the beacons were to be moved onto the site genny but looks like that didn’t work out.
Will have to renegotiate another visit to get that done.

Gordon
GI6ATZ





Re: Virtual Radar Server plane feed has stopped working

Dave
 

Hello John,
I would be happy to pay a subscription to get the service.
73
Dave G4GLT. 


On 25 Jul 2022, at 21:55, John Quarmby via groups.io <g3xdy@...> wrote:



 Update on Airscout plane feed issue, pretty much as expected I'm afraid.

I would be happy to collate responses to Frank on those running ADS-B RXs if you wish.

73

John G3XDY



-------- Forwarded Message --------
Subject: Virtual Radar Server plane feed has stopped working
Date: Mon, 25 Jul 2022 19:59:18 +0200
From: Frank Schmähling <dl2alf@...>
To: dl2alf@...


Hi all,

 

Maybe you already know this from other sources:

 

The operators of the Virtual Radar Server plane feed had cancelled their free service to the AirScout community.
Bad news, but we are thankful for using this opportunity since many years! Now, we should face the truth that nothing is for free
without giving a return.

So everybody of the AirScout community should consider operating an ADS-B receiver (if it's legal in his country) and feeding the 
data to the ADSBExchange servers!

If you already do so, please send me an 
email. A list of all recent feeders could be a good base for negotiations.
This is the only way to get this service back! 

 

73 de Frank, DL2ALF


Virus-free. www.avast.com


Virtual Radar Server plane feed has stopped working

John Quarmby
 

 Update on Airscout plane feed issue, pretty much as expected I'm afraid.

I would be happy to collate responses to Frank on those running ADS-B RXs if you wish.

73

John G3XDY



-------- Forwarded Message --------
Subject: Virtual Radar Server plane feed has stopped working
Date: Mon, 25 Jul 2022 19:59:18 +0200
From: Frank Schmähling <dl2alf@...>
To: dl2alf@...


Hi all,

 

Maybe you already know this from other sources:

 

The operators of the Virtual Radar Server plane feed had cancelled their free service to the AirScout community.
Bad news, but we are thankful for using this opportunity since many years! Now, we should face the truth that nothing is for free
without giving a return.

So everybody of the AirScout community should consider operating an ADS-B receiver (if it's legal in his country) and feeding the 
data to the ADSBExchange servers!

If you already do so, please send me an 
email. A list of all recent feeders could be a good base for negotiations.
This is the only way to get this service back! 

 

73 de Frank, DL2ALF


Virus-free. www.avast.com


Re: GB3NGI

Gordon GI6ATZ
 

Hi John

There was a power outage at the site over the weekend - not sure when it started (sometime mid Saturday) and power was restored yesterday morning at 10:00am so maybe that’s why you didn’t hear it. I only found out about it late Saturday night when the GSM switch reported it was running on battery.
There was a recent site visit (not by me) to reprogram the 70cms beacon and as part of that visit the beacons were to be moved onto the site genny but looks like that didn’t work out.
Will have to renegotiate another visit to get that done.

Gordon
GI6ATZ


Re: G8MBU beacon

John G8IKP
 

Thanks for the update.  I've been missing I was thinking temperature problems.   John G8IKP


Re: Activity List for the UK Microwave Group 5.7GHz and 10GHz Contests - Sunday 31st July

John Lemay
 

Hi John

Here's my (cunning) plan:-

Callsign: G4ZTR
Locator: JO01KW
Band: 10GHz 10W 80cm offset dish
Talkback: ON4KST, 144MHz
Times: Various throughout

Regards

John

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of John Quarmby via groups.io
Sent: 25 July 2022 14:18
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Activity List for the UK Microwave Group 5.7GHz and 10GHz Contests - Sunday 31st July

The next sessions of the UKuG 5.7GHz and 10GHz Contests take place this
Sunday, 31st July from 0600 - 1800 GMT (0700 - 1900 BST).

Entrants can operate for a maximum of 8 hours during the contest period.

Full rules are here: https://www.microwavers.org/files/2022-mwrules_v2.pdf

As usual I will publish an activity list next Saturday, please post
details of your plans by early Saturday in the usual format:

Callsign: G3XDY
Locator: JO02OB
Bands: 5.7GHz 15W 75cm dish
10GHz 20W 75cm dish
Talkback: ON4KST, Zello SHF Chat
Times: Various throughout

73

John G3XDY
UKuG Contest Manager


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


Re: GB3NGI

Richard GD8EXI
 

John
    Appears to be functioning fine here visually in IO74PC only 144Kms away but through a 230 metre very steep hill. Screen shoot  attached. As to strength looks about average but about 30dB weaker than at one point last week when there was good tropo.

Richard
GD8EXI


On 25/07/2022, 16:37, "John Lemay" <john@...> wrote:

> The recent query about G8MBU has reminded me to ask about GB3NGI on 23cms:-
>
> A couple of weeks ago I used aircraft scatter to compare a dish with a small
> box of yagis, and on both antennas I had decodes of the JT4G about 15 times
> per hour.
>
> I repeated the test this weekend, but over many hours, there was not a
> single decode. That's a bit of a surprise, because it usually seems to me
> that regardless of tropo conditions, aircraft scatter can be pretty
> reliable.
>
> GB3NGI was last spotted on Beaconspot on the 18th July.
>
> So, I am wondering, is it functioning normally ?
>
> John G4ZTR
>
>
>
>
>
>


Re: Activity List for the UK Microwave Group 5.7GHz and 10GHz Contests - Sunday 31st July

Clive Elliott GW4MBS
 

Callsign: GW4MBS/P
Locator: IO71XW
Bands: 5.7GHz 8W 65cm dish
            10GHz  12W 65cm dish
Talkback: ON4KST, Zello SHF Chat
Times: Morning & early afternoon 10GHz only
            Late afternoon 5.7GHz only
If it is raining I will stay at home & operate both bands.
If it rains when out portable I will continue to operate on whatever band I am set up on.
--
Clive GW4MBS (ex-G8ADP)
Pottering on 6m - 3cm in a valley in IO71XW where any QSO is a triumph of optimism over geography!


Re: Gyrotrons and free-electron masers anyone?

Neil Smith G4DBN
 

Hi Colin, it would be good to have some pointers to papers and documentation about how the various gyrotron variants all work.  Most of the Google hits and literature searches produce swathes of superficial detail or extraordinarily over-detailed specifics.  I'm looking for review articles and some technical details about how magnetron injection guns and other sources are actually configured and used, plus details about magnet configurations and cavity designs, sufficient to make some reasonably-realistic 3D animation models.  A lot of that level of detail is probably commercially-sensitive, but the academic work is usually published, albeit behind paywalls.  Someone with insider knowledge might be able to point me at some papers that would help me avoid the fire-hose of twaddle and the deep rabbit-holes of detail.
Neil


On 24/07/2022 13:26, Colin Ranson wrote:

Neil, I know someone who designs and builds support electronics for particle accelerators..... would he be able to help do you suppose ? Lives in Ipswich.

 

 

Regards

 

 

Colin.

 

Sent from Mail for Windows

 

From: Neil Smith G4DBN
Sent: 24 July 2022 00:51
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Gyrotrons and free-electron masers anyone?

 

Does anyone on the list have some juicy links or specialist knowledge about free-electron maser/cyclotron resonance devices liks gyroklystrons, gyrotrons and similar?  Specifically about whether the electron velocity/energy needs to be relativistic (greater than a Lorentz factor of 1.2 perhaps?) to get amplification, and whether than means more than 80kV accelerating voltage, or if there's a lower-energy (or less death-ray-emitting) configuration that can still produce useful amplification albeit at terrible levels of efficiency?

Asking for a friend....

 



GB3NGI

John Lemay
 

The recent query about G8MBU has reminded me to ask about GB3NGI on 23cms:-

A couple of weeks ago I used aircraft scatter to compare a dish with a small
box of yagis, and on both antennas I had decodes of the JT4G about 15 times
per hour.

I repeated the test this weekend, but over many hours, there was not a
single decode. That's a bit of a surprise, because it usually seems to me
that regardless of tropo conditions, aircraft scatter can be pretty
reliable.

GB3NGI was last spotted on Beaconspot on the 18th July.

So, I am wondering, is it functioning normally ?

John G4ZTR

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