EQUIPMENT BACKGROUND
After years of use and then storage once the analog Teletext television system was turned off yonks ago, I have finally gotten around to placing this professional, very well built equipment onto the workshop bench ... the "operation" has begun
This equipment was fully functioning but of no possible further use in our digital television (with no teletext broadcasts) era so now I have extracted components and modules "of interest" which can be used to restore another EH-1000 or possibly suit use in other "dated" equipment - parts that you will probably never find anywhere else!
Now it's time to take out the scalpel and start the op!
One the of the first things to note is that although this is branded Unaohm and manufactured in Italy, the components inside have been substantially sourced from European and English component manufacturers, the likes of Siemens and Philips.
THE DONOR EQUIPMENT
UNAOHM - Teletext Video RF Analyser
Model: EH-1000
Designed & manufactured in Milano, ITALY
Circa Late 1980's (based on advertisements placed in Wireless World at the time and the date stamp on the AC transformer core)
Technology: Analog video broadcast signal analysis - specifically for examining lines of Teletext information "riding along" with the video signal
Luggable (heavy at 15kg) due to the heavy duty Aluminium outer case but more importantly, the inside welded steel frame chassis inside.
Well engineered inside, logically laid out using a number of modules which are well interconnected.
Designed for 220V 50Hz operation (because of this, we used this equipment via an AC variac many years ago)
Green emitting rectangular CRT based front panel display
Interested in the technical nitty gritty? Here is an old copy of the spec sheet
Enough information about the "patient" now to the component(s) I have removed
COLLET KNOB
No name or codes on this knob but I have a very strong suspicion this knob is sourced from SIFAM (UK)
Material: Flexi-plastic body & removeable top cap (almost like a psuedo rubber) and Brass collet assembly
The knob has a very slight angle from the top downwards, ribbed sides for easy grip
Height overall (including the push to fit top cap) 22.5mm
Top diameter 14.5mm
Lower main body diameter 15mm
Lower skirt which makes the "bottom" diameter actually 20.5mm
White pointer line on the skirt ONLY
The skirt IS easily removable
Brass two piece collet assembly with a crosshead screw to tighten/loosen the collet (under the 'pop off' top cap)
The collet is to be used with a circular 4mm diameter shaft
In the EH-1000, this is the FUNCTION control knob, located to the right of the Line Selector three gang switch
CLEAN
NO damage, pieces missing or even scratching
