GENERAL MICROWAVE POWER MEASURING HEAD N446A

[Zlatko]

Halloooooo GHz fraternity!
Last three Year I was owner of  Microwave  sensor head „General Microwave  N446A“ . Simple display unit  I make alone. Head was bayed over ADCOM MICROWAVE,  Hazandonk 18, NL 5103GH  DONGEN. Some detailed dokumentation about head I dont have. Only how is necesery to conect head with power supply and instrument.
During reparing my 23cm transverter something start to oscilated unexpected ( or start to work as must )  sensor head BLOW UP.  :'(Neaddle I dont can now ziroed  ( stay below ziro )... I dont can balancing measuring bridge !

My quuestion- my request is:

0.If  anybody have shematics from this family sensor heads, pleas to send me one coppy ?

1.Have anybody some expirience with reparing THIS sensore head. Is there thermistors ( NTC ) or PTC heathing elements? As I see, this elements is pasted on some transparent foil sandwich ( plastic or something like mica ? ). Alls connection, at first between middle contact of N conector and heathing elements , an later to connect point for wire, is also some pasted golded? ribon?? Is posible renew contact with some conductive paint ( like Elcolit )?

2.Is it posible to find-buy ( where? ) complet foil with alls hething elements  for replacing in dont functionable sensor head?

3. Is it posible to find-buy ( where? ) complet  FUNCTIONAL sensor head N446A ?

Much question for my first contact here....sry.... You can probably understand my situation.. Without some instrument like this I am as blind !!!
If is posible pleas answer on english ( or german ) here or on my Email ( 9a3aq@hamradio.hr )

TNX for understanding and for help & and max 73 for alls GHz fans

Zlatko / 9A3AQ

ps. I have put some picture from N446A inside on
      http://img249.imageshack.us/g/agenmicrowaven446aheadi.jpg/

[Frans PE1FOT]

Hello Zlatko, welcome to our group.

In SCATTERPOINT of february 2007 M0EYT describes repairs of Marconi TFT power heads( 6240,6421).
In this article also info is given about the 6440N powersensor which looks the same as yours.
If you need a copy of the article please let me know.
Some pictures you can find on http://www.uhf-satcom.com/misc/tft/

Best regards
Frans
PE1FOT

[Zlatko]

Hallooo Frans!
Thanks for quick answer! I have lucked on sugested link.. Yes, there is some pictures wich look as mine late power head... I have non access to Scaterpoint and if is not problem to You, pleas send mee a copy of article.
Live firma ADCOM MICROWAVE anymore? I try to put in gooogle, but nothing find.
Here we have problem with GHz measuring instruments... power meter is krutial-milestone instrument!!!
Same story is with HP 486 for HP432 Bolometer....
TNX in adwance..73!
Zlatko / 9A3AQ

[Frans PE1FOT]

Hello Zlatko,
You can download the Scatterpoint Feb.2007 issue at http://www.microwavers.org/indexs.htm
I will send an email to Adcom and request if they can contact you by email

Best regards
Frans
PE1FOT

[Zlatko]

Super Frans!
I have succesfull downloaded alls.. ( in Scaterpoint I have find also more interested aticles ) ).
This article from M0EYT must I cerfully read and probably find something ! But best description is in US Patent as I see in short....
If come some Email from ADCOM that bee also nice !!! Mybee is something still on stock??? Did some from GHz fraternity work there

Again TNX for HELP !   !!!!!!!!!!!!!!!!
MAX 73 !
Zlatko / 9A3AQ