Date   

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





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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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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








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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






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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


Re: 70 Watt amplifier kit for 23cms coming soon

Robin Szemeti - G1YFG
 

My half-assed plan is to put a 48V socket on the pack of the 23cm amp, the 70cm amp already has one ... shack use and portable with a genny, I shall use the mains input ... otherwise, I shall lob 4 batteries in the back of the car. to supply the 48v


On Mon, 29 Jun 2020 at 19:14, Andy G4JNT <andy.g4jnt@...> wrote:
It's ironic that a switch mode PSU from 12V for 2C39 amps would have been quite a straightforward project.   With only one high voltage to generate at 100 Watts or so, grid bias applied to the cathode derived from the 12V, as well as the heater, and that's all.  No complicated screens, protection, negative supplies all interlocked   AT one point, yonks ago, I had the high voltage supply, near enough to that anyway, built; but that was for another reason altogether.



On Mon, 29 Jun 2020 at 17:01, Derek Brown G8ECI via groups.io <g8eci=yahoo.co.uk@groups.io> wrote:
Hi James

I would be certainly interested in a kit, i have trying to rebuild my old 2C39A EME amp for about 5 years and still no where near to finishing, a sspa and preamp right under the antenna would be briliant. Please put my name and call in the list Derek G8ECI JO03ai

73 Derek G8ECI



Sent from my Samsung Galaxy smartphone.


making progress

militaryoperator
 

Hopefully, I can increase my 9Cm score next time. 

PA just tested (Stealth) and 22W out. Along with LNA in the box I'm hoping for great things. 

Slight problem with SGLab trvrt, seems its rf switching is interfering with the ptt hard line. 
The SGL has a open collector o/p pin, so that goes to relay in amp. 
But, when I tx, relays go over in amp but as I let go ptt the rf switching in SGL re-energises the oc line, 
so relay in amp goes momentarily back, then closes again and waits for the sequencer in the SGL to switch off. 

Must check the SGL book see if rf switching can be disabled.

All good fun !

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

Martin <gw3xjq@...>
 

I am interested in this kit. Where/how can I find the photos you refer to?   I am a 'new boy' on this forum and to 23 cms, but have started putting something together. 73 Martin GW3XJQ


Re: 70 Watt amplifier kit for 23cms coming soon

G0FVI
 

Hi James,
please put me down on the list for a kit too.

Andy G0FVI


Re: 24?

militaryoperator
 

Hello Ben
Ben wrote:
24GHz Transceiver Transverter DMC

Anyone played with these? are they worth it?
If you acquire one for nothing, it's worth having. If they are the right type - and I can't remember the type numbers - they could be a useful source of system components, but it's very much luck of the draw. I've had useful filters, and amplifiers, WG parts, a synthesiser which came out in-band with relatively little tweaking, and quite a few 25GHz rated SMA cables, but nothing can be guaranteed, even synthesisers of the same apparent type number can behave differently!
The boxes I've seen were assembled from a series of system parts for use as data links in the 22 - 23GHz area. There are/were some notes on the net about modifying the units. I wrote a brief note for Scatterpoint in the 2008 period on retuning one synth (which ran in my personal beacon for several years) but other people had problems.
I hope that's useful
73
Chris G4DGU
_._,_._,_


Thanks for the thoughts Chris. Will have to think a bit, hi. 

Ben


KST Question - Final Answer

Andy G4JNT
 

What a lot of typos in the last message (too early in the morning).  So many that here it is again, repaired. :-(


FINAL WORD ON IT
Re. the activation; I got a reply from ON4KST stating 

Which is the one I got by trial and error.    Seems that if you need to ACTIVATE a new callsign, you don't got to the KST site and click on "Enter Microwave chat", or whatever.  You need to go to that URL above, then enter whichever chat you want to use

Once the callsign is registered with ON4KST,  then KST2Me will just go

The whole setup is a bit WEIRD, but works when you know the rules.



On Mon, 29 Jun 2020 at 13:43, Andy G4JNT via groups.io <andy.g4jnt=gmail.com@groups.io> wrote:
You can log in yo KST2Me with different parameters set by appending a digit when you call up the programme.   From a command line it would look like this :   KST2Me 2. 

You can create a new start icon i n Windows by copy / pasting the old one then editing the properties to     "~~~~~KST2M.exe 2"
All is decribed in the .PDF manual accessible via the Help-Manuals button.


Re: KST Question

Andy G4JNT
 

FINAL WORD ON IT
Re the activation, I got a reply from ON4KST stating 
"try this URL: www.on4kst.info/chat/login.php  "

Which is teh jone I got by trial and error.    Seems that if you need to ACTIVATE a new callsign, you don't got to teh KST site and click on "Enter Microwave chat", or whatever.  Yu need to go to that URL above, then enter which chat you want o use

Once the callsign is registered with ON4KST,  then KST2Me will just go

The whole setup is a bit WEIRD, but works when you know the rules.



On Mon, 29 Jun 2020 at 13:43, Andy G4JNT via groups.io <andy.g4jnt=gmail.com@groups.io> wrote:
You can log in yo KST2Me with different parameters set by appending a digit when you call up the programme.   From a command line it would look like this :   KST2Me 2. 

You can create a new start icon i n Windows by copy / pasting the old one then editing the properties to     "~~~~~KST2M.exe 2"
All is decribed in the .PDF manual accessible via the Help-Manuals button.

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