Searching for thermistors to repair a uW power meter
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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
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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.
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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
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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:
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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
Von: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Im Auftrag von DF6NA Rainer
Hallo Matthias,
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Hi Greg,
Ok, will do.
Kind regards
Matthias
Von: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Im Auftrag von 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.
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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
Von: UKMicrowaves@groups.io <UKMicrowaves@groups.io>
Im Auftrag von 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:
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