Date   

Re: Searching for thermistors to repair a uW power meter

DD1US
 

Hi Robin,

 

Possibly.

 

The challenge is to thermally isolate the detector from unwanted influeces.

 

The K19 is very nice in this respect with a diameter of only 0.4mm and very thin leads.

 

Regards

 

Matthias

 

www.dd1us.de

 

 

Von: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Im Auftrag von Robin Szemeti - G1YFG
Gesendet: Mittwoch, 24. Februar 2021 20:08
An: UKMicrowaves@groups.io
Betreff: Re: [UKMicrowaves] Searching for thermistors to repair a uW power meter

 

Could you notuse surface mount types?  There are many electrically similar devices intiny packages .. if you can mount them ...

 

 

On Wed, 24 Feb 2021 at 18:33, Greg - ZL3IX <zl3ix@...> wrote:

If you manage to find some, please let me know, Matthias. A couple of years ago I tried to find a pair of these thermistors to make a DJ4GC power meter, but I was unsuccessful. I don't believe they are made any more.


--
Robin Szemeti - G1YFG


Re: Searching for thermistors to repair a uW power meter

DD1US
 

Hi Greg,

 

Ok, will do.

 

Kind regards

 

Matthias

 

www.dd1us.de

 

 

Von: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Im Auftrag von Greg - ZL3IX
Gesendet: Mittwoch, 24. Februar 2021 19:33
An: UKMicrowaves@groups.io
Betreff: Re: [UKMicrowaves] Searching for thermistors to repair a uW power meter

 

If you manage to find some, please let me know, Matthias. A couple of years ago I tried to find a pair of these thermistors to make a DJ4GC power meter, but I was unsuccessful. I don't believe they are made any more.


Re: Searching for thermistors to repair a uW power meter

DD1US
 

Hello Rainer,

 

Yes, as I mentioned that should be the power meter as designed by Carsten Vieland DJ4GC.

 

Do you have some of them left or know a source ?

 

Kind regards

 

Matthias

 

www.dd1us.de

 

 

Von: UKMicrowaves@groups.io <UKMicrowaves@groups.io> Im Auftrag von DF6NA Rainer
Gesendet: Mittwoch, 24. Februar 2021 20:15
An: UKMicrowaves@groups.io
Betreff: Re: [UKMicrowaves] Searching for thermistors to repair a uW power meter

 

Hallo Matthias,

irre ich mich oder waren das nicht Dioden die DJ4GC verwendet hat ???

73, Rainer


Am 24.02.2021 um 13:47 schrieb DD1US:

Dear all,

 

I have here an old power meter which was apparently built according to a description of Carsten Vieland DJ4GC.

 

It uses the principle of a bolometer.

 

Unfortunately, the thermistors are defective and I need to replace them.

 

They are apparently of the following type: Siemens NTC type K19 nominal 12kOhms

 

Does anyone here in the group have a pair (or two in case something goes wrong during the repair action) of

such thermistors which he would be willing to sell ?

 

Also if someone knows a shop etc where to buy them a hint would be appreciated.

 

Many thanks in advance for your answers.

 

Kind regards

 

Matthias

 

www.dd1us.de

 

 


Iberian MicroMeet 2021 Virtual Meeting #photo-notice

ea4bfk
 

Dear all

 

This is to let you know that on Sunday Feb 28, the Iberian Microwavers Gang will run its annual meeting on-line. The meeting will be held in Spanish, sorry ! But contents I believe it deserves to be known by the group.

Streaming will be on YouTube www.micromeet.org/youtube and QO-100.

 

Afterwards Videos will remain on Micromeet YouTube channel, where English subtitles will available.

 

Attached the Poster including the conferences we have plan and timings on UTC time.

 

Regards

 

Alex

EA4BFK

 


Re: Searching for thermistors to repair a uW power meter

DF6NA Rainer
 

Hallo Matthias,

irre ich mich oder waren das nicht Dioden die DJ4GC verwendet hat ???

73, Rainer


Am 24.02.2021 um 13:47 schrieb DD1US:

Dear all,

 

I have here an old power meter which was apparently built according to a description of Carsten Vieland DJ4GC.

 

It uses the principle of a bolometer.

 

Unfortunately, the thermistors are defective and I need to replace them.

 

They are apparently of the following type: Siemens NTC type K19 nominal 12kOhms

 

Does anyone here in the group have a pair (or two in case something goes wrong during the repair action) of

such thermistors which he would be willing to sell ?

 

Also if someone knows a shop etc where to buy them a hint would be appreciated.

 

Many thanks in advance for your answers.

 

Kind regards

 

Matthias

 

www.dd1us.de

 



Re: Searching for thermistors to repair a uW power meter

Robin Szemeti - G1YFG
 

Could you notuse surface mount types?  There are many electrically similar devices intiny packages .. if you can mount them ...


On Wed, 24 Feb 2021 at 18:33, Greg - ZL3IX <zl3ix@...> wrote:
If you manage to find some, please let me know, Matthias. A couple of years ago I tried to find a pair of these thermistors to make a DJ4GC power meter, but I was unsuccessful. I don't believe they are made any more.


--
Robin Szemeti - G1YFG


Re: 2.4m dish & 40ft clark pump up mast

Roger Ray
 

The dish is no spoken for.


Re: Searching for thermistors to repair a uW power meter

Greg - ZL3IX
 

If you manage to find some, please let me know, Matthias. A couple of years ago I tried to find a pair of these thermistors to make a DJ4GC power meter, but I was unsuccessful. I don't believe they are made any more.


2.4m dish & 40ft clark pump up mast

Roger Ray
 

Do to needing the space. A General Dynamics 1241 2.4m dish - dismantled, as removed from Dubai, described in Scatterpoint. Plus a 40ft clark mast must go. Both in Brentwood Essex.
Please email me direct if interested.
Roger
G8CUB


Re: Supporting the dish feed

Dave G6HEF
 

Hi John,

All interesting stuff. Out of interest what are you steering it with? I've yet to get as far as making a dish but my approach was planned to be something similar to yourself. However I was looking at the SPID solutions a lot of people use counter weights seems essential. It seems to me being able to rotate around the centre of gravity would be far more mechanically sensible and I have schemes in my head to achieve this. However, yours looks something like what I had in mind so interested in how you have done it.

Dave G6HEF


Re: 3.4GHz dish

g3zqu
 

The Anglian was John Bays G3KFX (sk). He moved to VK land and became VK2SB
Martin G3ZQU


Re: 3.4GHz dish

g3zqu
 

The callsign of the author was G4BYV not W as printed. I built one for 2.3GHz and John gave me the mesh to cover it! Still have his FT290R and his homebrew 2 tone oscillator in the shack.
Martin G3ZQU


Re: 3.4GHz dish

Colin Ranson
 

John G4BYV ? was he the chap who made the Anglian Linears ?

 

de G8LBS

 

Sent from Mail for Windows 10

 

From: John Fell
Sent: 24 February 2021 10:18
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] 3.4GHz dish

 

Hi Andy ,

As Andy JNT says it is available .

Could dig out the flatbed scanner if you cannot locate the article on-line.

 

I must thank Dave G4FRE who mailed me to say I had confused the Author's callsign with another well known UK one .

 

It was John G4BYV (SK) who provided the original article notes .The guy holding the template against the ribs was a 34 year old version of me .

 

The hardwood former for the rib bending is still in my garage .

 

I used 1"x1/8" Aluminium flat bar for the 4 feed support arms and added a short scaf pole to the rear of the central hub plate to allow rapid mast mounting for contesting .

In those days any size dish was hard to come by .....

 

I was also responsible for the 18" PW dish ( I had got fed up with lugging around a galvanised steel dustbin lid for my 10GHz /P outings ).

 

73

JOhn

G0API

 

On Wed, 24 Feb 2021 at 08:33, Andy GD1MIP <gd1mip@...> wrote:

John,

Do you have the ability to scan that article?  I'd like to read it.

Thanks Andy GD1MIP 

 


Re: wtKST

John Lemay
 

Brian

Thanks, I believe you are correct. Trouble was that without your pointer I
didn't find the file, despite looking in the usual places.

Now working nicely ......... until it doesn't !

John G4ZTR

-----Original Message-----
From: UKMicrowaves@groups.io [mailto:UKMicrowaves@groups.io] On Behalf Of
Brian Howie GM4DIJ
Sent: 24 February 2021 13:04
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] wtKST

In message <028e01d70a34$207821c0$61686540$@carltonhouse.eclipse.co.uk>,
John Lemay <john@carltonhouse.eclipse.co.uk> writes
Anyone else having trouble with wtKST tonight? It no longer connects me.
I've changed nothing so I'm lost !

John G4ZTR
I get that. It goes into a loop trying to connect.
There's files in WTkst local directory that get corrupted.
It lives at:-

Users/"$username"/AppData/Local/Wtkst or something like that.

Delete the directory and restart. All the settings will be lost of
course.

Brian GM4DIJ
--
Brian Howie






--
This email has been checked for viruses by AVG.
https://www.avg.com


Re: wtKST

Anthony Coldman
 

That's happened to me a couple times, each time I deleted and reinstalled
and then all ok, I think it might be due not disconnecting before closing
the program, but can't verify that 100%.

Regard's Anthony G7LRQ

-----Original Message-----
From: UKMicrowaves@groups.io <UKMicrowaves@groups.io> On Behalf Of Brian
Howie GM4DIJ
Sent: 24 February 2021 13:04
To: UKMicrowaves@groups.io
Subject: Re: [UKMicrowaves] wtKST

In message <028e01d70a34$207821c0$61686540$@carltonhouse.eclipse.co.uk>,
John Lemay <john@carltonhouse.eclipse.co.uk> writes
Anyone else having trouble with wtKST tonight? It no longer connects me.
I've changed nothing so I'm lost !

John G4ZTR
I get that. It goes into a loop trying to connect.
There's files in WTkst local directory that get corrupted.
It lives at:-

Users/"$username"/AppData/Local/Wtkst or something like that.

Delete the directory and restart. All the settings will be lost of course.

Brian GM4DIJ
--
Brian Howie


Re: wtKST

Brian Howie GM4DIJ
 

In message <028e01d70a34$207821c0$61686540$@carltonhouse.eclipse.co.uk>, John Lemay <john@carltonhouse.eclipse.co.uk> writes
Anyone else having trouble with wtKST tonight? It no longer connects me.
I've changed nothing so I'm lost !

John G4ZTR
I get that. It goes into a loop trying to connect.
There's files in WTkst local directory that get corrupted.
It lives at:-

Users/"$username"/AppData/Local/Wtkst or something like that.

Delete the directory and restart. All the settings will be lost of course.

Brian GM4DIJ
--
Brian Howie


Searching for thermistors to repair a uW power meter

DD1US
 

Dear all,

 

I have here an old power meter which was apparently built according to a description of Carsten Vieland DJ4GC.

 

It uses the principle of a bolometer.

 

Unfortunately, the thermistors are defective and I need to replace them.

 

They are apparently of the following type: Siemens NTC type K19 nominal 12kOhms

 

Does anyone here in the group have a pair (or two in case something goes wrong during the repair action) of

such thermistors which he would be willing to sell ?

 

Also if someone knows a shop etc where to buy them a hint would be appreciated.

 

Many thanks in advance for your answers.

 

Kind regards

 

Matthias

 

www.dd1us.de

 


Re: SHF UKAC

Neil Smith G4DBN
 

The rain was probably not quite in the right place by the time I got on Ben, but the wind was just ridiculous until 2030 anyway.

I should really put in some permanent guying arrangements, but then I'd have to lock off the SCAM sections and it all adds to the amount of faff. If I had a full second transverter/PA and smaller dish it might make sense to deploy that on windy days, but also if it could see round my tree belt I could work the folks in IO91/92 that are blocked from the main mast.

I should have a new transverter soon, as the first batch of F6BVA 3cm-UHF transverter PCBs has just been shipped from the fabricator to F5BQP and the first batch of local oscillators is on the way to me from DF9NP. Some of the parts are on back order, so it will be a while before we can get them operational. I now have 16 boards on the waiting list for the next batch with several others thinking about it. Pierre-François has just asked for expressions of interest in another PCB group buy. 

It will be nice to hear some of the transverters on the air.  Even barefoot with a Pluto or something as IF it should be feasible to work a few stations, and if we can get a 1-2 watt PA kit sorted, or find a good supply of ex-equipment PAs, even I might hear a few of the boards on the band from up here.

Neil G4DBN

On 24/02/2021 10:51, militaryoperator via groups.io wrote:
Sorry we missed you Neil.  1 qso in the first 1/2 hour, pole was only a few feet up and swaying about like made. 

Tried with 2 others, nil and no replies to several KST shouts and CQ's so gave up by 8:30.

Next time, hi. 

Ben G4BXD


 

It was pretty scary here, even with some extra guying and with the dish
at 20ft.  Still, four stations over 200km with the dish just peeping
over the barn roof is not too shabby.  The storm south of Sheffield was
blowing directly along the path from Peter G3PHO to me, and as he has to
beam 180 away to get a reflection, he was actually reflecting off the
scatter point, with the hydrometeors moving very fast towards both of
us. I nearly missed his reply as the CW was shifted way outside my
passband and spread over 1kHz wide. As Peter is on the other side of a
500ft hill from here, the rain must have been between him and the usual
reflection point, which we have still not identified, as there was no
simple reflection at all, just the RS.

Started very late and gave up early. Nine contacts. Nice to make it with
Martyn G3UKV on gravelly SSB via the same storm as with Peter.

Neil G4DBN
_._


Re: 3.4GHz dish

DF6NA Rainer
 

73, Rainer


Am 24.02.2021 um 11:17 schrieb John Fell:

Hi Andy ,
As Andy JNT says it is available .
Could dig out the flatbed scanner if you cannot locate the article on-line.

I must thank Dave G4FRE who mailed me to say I had confused the Author's callsign with another well known UK one .

It was John G4BYV (SK) who provided the original article notes .The guy holding the template against the ribs was a 34 year old version of me .

The hardwood former for the rib bending is still in my garage .

I used 1"x1/8" Aluminium flat bar for the 4 feed support arms and added a short scaf pole to the rear of the central hub plate to allow rapid mast mounting for contesting .
In those days any size dish was hard to come by .....

I was also responsible for the 18" PW dish ( I had got fed up with lugging around a galvanised steel dustbin lid for my 10GHz /P outings ).

73
JOhn
G0API

On Wed, 24 Feb 2021 at 08:33, Andy GD1MIP <gd1mip@...> wrote:
John,

Do you have the ability to scan that article?  I'd like to read it.

Thanks Andy GD1MIP 


Re: 3.4GHz dish

Andy GD1MIP
 

Thanks John and all.

Andy GD1MIP 

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