Date   

Re: Scavenging parts

militaryoperator
 

No idea, plate was too far gone. 

EKCO made

Ben



-----Original Message-----
From: Paul G8KFW <paul@...>
To: UKMicrowaves@groups.io
Sent: Wed, 1 Jul 2020 15:26
Subject: Re: [UKMicrowaves] Scavenging parts

Hi what was the nose radar from military or civil
 
Paul
 

From: UKMicrowaves@groups.io [mailto: UKMicrowaves@groups.io ] On Behalf Of militaryoperator via groups.io
Sent: 01 July 2020 13:03
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Scavenging parts
 
Took my nose radar apart. 
 
Guess the most useful thing is the 46cm dish. 
 
Still, interesting project.  What's the waveguide with the 4 screw-like things on it, top right?
 
DSCF2519.JPG
 
 
odd.JPG
 
 
 
 
 
--------------------------------------
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
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--
Paul Bicknell G8KFW   South Coast UK


Re: QO100 This Thursday

Nick Gregory G0HIK
 

Great.

Weather forecast has gotten worse, lets hope it doesn't get too wet.

Nick G0HIK


Re: Scavenging parts

KENT BRITAIN
 

r

DSCF2519.JPG

 

  Zooming in it looks like your dish also has a Cuttler Feed
Note the 90 deg twist in the feed.   For years I wondered
"Didn't they know what polarization they wanted before they
 did the design?"
There is a surface current that runs back down the outside of
the WG. Goes into the dish, and gets radiated.  SIDELOBES!
The 90 deg twist makes the signals at the feed cross polarized
 to the sideblobes.    Someone did know what they were doing.
70 years ago!    Kent


 

 

 

 

 

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

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

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

 


--
Paul Bicknell G8KFW   South Coast UK


Re: Scavenging parts

KENT BRITAIN
 

Made by RCA, I suspect commercial.

Kent

On Wednesday, July 1, 2020, 9:24:46 AM CDT, Paul G8KFW <paul@...> wrote:


Hi what was the nose radar from military or civil

 

Paul

 


From: UKMicrowaves@groups.io [mailto: UKMicrowaves@groups.io ] On Behalf Of militaryoperator via groups.io
Sent: 01 July 2020 13:03
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Scavenging parts

 

Took my nose radar apart. 

 

Guess the most useful thing is the 46cm dish. 

 

Still, interesting project.  What's the waveguide with the 4 screw-like things on it, top right?

 

DSCF2519.JPG

 

 

odd.JPG

 

 

 

 

 

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

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

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

 


--
Paul Bicknell G8KFW   South Coast UK


Re: Scavenging parts

Paul G8KFW
 

Hi what was the nose radar from military or civil

 

Paul

 


From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of militaryoperator via groups.io
Sent: 01 July 2020 13:03
To: UKMicrowaves@groups.io
Subject: [UKMicrowaves] Scavenging parts

 

Took my nose radar apart. 

 

Guess the most useful thing is the 46cm dish. 

 

Still, interesting project.  What's the waveguide with the 4 screw-like things on it, top right?

 

DSCF2519.JPG

 

 

odd.JPG

 

 

 

 

 

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

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

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

 


--
Paul Bicknell G8KFW   South Coast UK


Re: Scavenging parts

KENT BRITAIN
 

Hi Keith

Best I could do from the ground.
The flexible sections of WG help a lot.

Aircraft prime focus dish with a 'Cuttler' feed.
This feed is also in the RSGB microwave books as
a 'Penny' feed.   

Yea, time for some spray paint.   All my antennas are painted 
'Battleship Grey'.   Makes them less obvious.

In your collection of WG bits, do you have any 90 deg twists? 
A short piece of WG that twists 90 deg?   Put in between two 
sections of flexible WG and you have a really flexible piece!
The flexes tend to flex in only one plane.   73 Kent

On Wednesday, July 1, 2020, 8:26:43 AM CDT, Keith <keith@...> wrote:


I have one WR 90 rotary joint and would love to get a second then I can use it in exactly the way Kent mentions.
Anyone got a spare please ??
Cheers
Keith


Re: Scavenging parts

KENT BRITAIN
 

I used some flexible WG after my rotary joint.   So got away with using only
one rotary joint.  Been working since 1988!       I do keep the WG pressurized.
An aquarium pump, then a 1.5L Pepsi bottle filled with Calcium Cloride, then
aquarium tubing to the WG15 (Yes I use 15, not 16) and the Heliax to the
EME array.  Kent

On Wednesday, July 1, 2020, 8:26:43 AM CDT, Keith <keith@...> wrote:


I have one WR 90 rotary joint and would love to get a second then I can use it in exactly the way Kent mentions.
Anyone got a spare please ??
Cheers
Keith


Re: Scavenging parts

Robin Szemeti - G1YFG
 

I suspect you would have to unscrew the knurled caps and have a look inside to be sure .. the possibilities that come to mind:

Ferrites as part of the duplexer arrangement?
or
Gas discharge tubes ... a "thing" in radar is small gas discharge tubes that ignite and conduct during each transmission pulse, the conducting gas acts as a high speed switch, shorting out the waveguide and preventing too much of the TX pulse getting into the crystal detector.  Normally I would expect them to be across the centre of the tube though, and these appear to be at the edge.

RF Sampling ports? 

Was the WG pressurised with nitrogen ?


On Wed, 1 Jul 2020 at 13:03, militaryoperator via groups.io <Military1944=aol.com@groups.io> wrote:
Took my nose radar apart. 

Guess the most useful thing is the 46cm dish. 

Still, interesting project.  What's the waveguide with the 4 screw-like things on it, top right?

DSCF2519.JPG


odd.JPG





--------------------------------------
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: Scavenging parts

Keith
 

I have one WR 90 rotary joint and would love to get a second then I can use it in exactly the way Kent mentions.
Anyone got a spare please ??
Cheers
Keith


Re: QO100 This Thursday

Dave G6HEF
 

Cool, gives me an excuse to fire up the gear. I'll look out for you on the bird.


Re: Scavenging parts

KENT BRITAIN
 

The rotary joints can be very handy is you mount your dish on a mast.
Helps you run the waveguide around the rotor.    Kent G8EMY

On Wednesday, July 1, 2020, 7:03:19 AM CDT, militaryoperator via groups.io <military1944@...> wrote:


Took my nose radar apart. 

Guess the most useful thing is the 46cm dish. 

Still, interesting project.  What's the waveguide with the 4 screw-like things on it, top right?

DSCF2519.JPG


odd.JPG





--------------------------------------
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: Vivaldi ant

KENT BRITAIN
 

Another example would be WG16,  suggested frequency range, 8-12 GHz.

Put a ridge down the middle, ridged waveguide, and the suggested frequency range
is now 5-12 GHz.     With the Vivaldi, how narrow you can make the slot sets the
upper frequency limit.  Width of the opening sets the lower frequency limit.
Kent

On Wednesday, July 1, 2020, 6:10:58 AM CDT, militaryoperator via groups.io <military1944@...> wrote:


Is there a benefit for mounting a Vivaldi in a horn enclosure?

Is this better than having the Vivaldi in the open?

s-l1600 (2).jpg

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


Scavenging parts

militaryoperator
 

Took my nose radar apart. 

Guess the most useful thing is the 46cm dish. 

Still, interesting project.  What's the waveguide with the 4 screw-like things on it, top right?

DSCF2519.JPG


odd.JPG





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


Little & Large

militaryoperator
 

Large bill and box...  little toy inside.

DSCF2527.JPG








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


Vivaldi ant

militaryoperator
 

Is there a benefit for mounting a Vivaldi in a horn enclosure?

Is this better than having the Vivaldi in the open?

s-l1600 (2).jpg

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: 70 Watt amplifier kit for 23cms coming soon

Chris G0WUS
 

Hi James put me on the list for a kit please

73 chris G0WUS



Sent from my Samsung Galaxy smartphone.


-------- Original message --------
From: Bob G8HGN <g8hgn73@...>
Date: 30/06/2020 7:01 pm (GMT+00:00)
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 70 Watt amplifier kit for 23cms coming soon

Hi James,

Could you put me on the list please, thanks,

Bob G8HGN

On 28/06/2020 21:59, James Smith via groups.io wrote:
I found a source of power transistors and decided to try them using John G4BAO's PCB design which is now public domain. He has unfortunately , run out of boards so I made my own with a scalpel to a similar design to test these transistors. results are very good on the first try - 80 watts saturated 70 watts P!dB and a gain of 14.4dB , 28 volt supply at about 5 amps @ 70W.
I am now building another one to test repeatability and if all is good then I will order some boards and look to selling a partial kit of PCB, transistor and ATC caps. No Idea of price yet. 
Since the supply of reliable MRF286's has dried up , this may help as a stopgap until another design comes along.
With great thanks to John Worsnop G4BAO for having done all the hard work in designing the matching and the rest of the PCB.
I won't say yet what device but will let you know soon.
The device used is a MRF5S9070 and I bought them as new old stock NOS from a UK firm who had them in stock for many years
I will make them available in partial kit form with a PCB made with Rogers 4350 , power transistor and ATC and C0G capacitors and when all the development is finished I will write an article for here and for CQ-TV magazine.
The expected kit price will be £30.00 + postage
See G4BAO amplifier in photos
Email me if you are interested and I will put you on the list.


Re: 70 Watt amplifier kit for 23cms coming soon

Bob G8HGN
 

Hi James,

Could you put me on the list please, thanks,

Bob G8HGN

On 28/06/2020 21:59, James Smith via groups.io wrote:
I found a source of power transistors and decided to try them using John G4BAO's PCB design which is now public domain. He has unfortunately , run out of boards so I made my own with a scalpel to a similar design to test these transistors. results are very good on the first try - 80 watts saturated 70 watts P!dB and a gain of 14.4dB , 28 volt supply at about 5 amps @ 70W.
I am now building another one to test repeatability and if all is good then I will order some boards and look to selling a partial kit of PCB, transistor and ATC caps. No Idea of price yet. 
Since the supply of reliable MRF286's has dried up , this may help as a stopgap until another design comes along.
With great thanks to John Worsnop G4BAO for having done all the hard work in designing the matching and the rest of the PCB.
I won't say yet what device but will let you know soon.
The device used is a MRF5S9070 and I bought them as new old stock NOS from a UK firm who had them in stock for many years
I will make them available in partial kit form with a PCB made with Rogers 4350 , power transistor and ATC and C0G capacitors and when all the development is finished I will write an article for here and for CQ-TV magazine.
The expected kit price will be £30.00 + postage
See G4BAO amplifier in photos
Email me if you are interested and I will put you on the list.


Re: 70 Watt amplifier kit for 23cms coming soon

G0FVI
 

If I read it correctly the kit will be based on G4BAO's design. You can read about it in 'microwave knowhow' https://b-ok.org/book/1204058/8a19de .


Re: F1JGP 10GHz PA

Adrian G4UVZ
 

Now on it's way to a new home


QO100 This Thursday

Nick Gregory G0HIK
 

Myself and Andrew G4VFL have been doing a few SOTA activation's from fell tops.

We hope to be out from separate Lake district Fells this Thursday, HardKnott and Whitfell.
Around 11:30 local, uplink 2400.350 +/-

We need a minimum of four contacts to "Qualify" an activation.

http://www.southgatearc.org/news/2020/june/qo-100-s2s-in-sota.htm#.XvtSFXVKjcu

Nick G0HIK

Nick G0HIK

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