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Old 19th Nov 2020, 1:15 pm   #1
Dennis M
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Default 3” screen 405 line portable Tv

Waiting on pictures as it is some distance from me but this TV has just surfaced.
3” screen 405 line portable unused still in it’s original packaging with all paperwork.
An uncle has it but could not remember the make when I spoke to him yesterday, hopefully he will email pics today.
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Old 19th Nov 2020, 1:30 pm   #2
Restoration73
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Default Re: 3” screen 405 line portable Tv

The only one I've seen is 625 but vhf and uhf;
https://www.radiomuseum.org/r/standard_sr_tv3ac.html
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Old 20th Nov 2020, 6:34 pm   #3
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Default Re: 3” screen 405 line portable Tv

Hi.
I've never been aware of a commercially built three inch portable for 405 Lines. I'm just thinking it's a VHF/UHF set for only 625 lines, for use in UK and Eire.
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Old 20th Nov 2020, 7:44 pm   #4
Dennis M
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Default Re: 3” screen 405 line portable Tv

After having been told it was a 405 line unit it turns out to be a 625 line Citizen ST955 pocket 2.2" LCD colour TV.
Never been used or had any batteries in it.
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Old 20th Nov 2020, 8:46 pm   #5
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Default Re: 3” screen 405 line portable Tv

https://www.radiomuseum.org/r/citizen_lcd_tv_st955.html

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Old 20th Nov 2020, 8:53 pm   #6
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Default Re: 3” screen 405 line portable Tv

I have a Sinclair leaflet from the second half of the 1960s advertising their first Microvision TV, which (IIRC) was for the VHF/405 standard. Of course, it may never have gone into commercial production.....
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Old 20th Nov 2020, 9:19 pm   #7
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Default Re: 3” screen 405 line portable Tv

I have a rather similar Casio TV 3500 that covers UHF and VHF but unfortunately its VHF Channel 1 doesn't tune low enough for UK VHF Channel 1

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Old 21st Nov 2020, 11:21 am   #8
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Default Re: 3” screen 405 line portable Tv

Hi Peter.
You could try BBC on channel 3 from Kirk o Shotts
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Old 21st Nov 2020, 11:26 am   #9
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Default Re: 3” screen 405 line portable Tv

Did anyone modify the Pilot TV37 for 405 lines?
Receiver has an electrostatic deflection CRT so no difficulties modifying the timebases for 405/50.

https://www.radiomuseum.org/r/pilot_candid_tv_tv37.html

DFWB.
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Old 21st Nov 2020, 12:39 pm   #10
Dave Moll
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Default Re: 3” screen 405 line portable Tv

Wouldn't there be problems with it expecting the system parameters for 625 e.g. FM intercarrier sound, negative video modulation etc?
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Old 21st Nov 2020, 12:52 pm   #11
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Default Re: 3” screen 405 line portable Tv

Quote:
Originally Posted by FERNSEH View Post
Did anyone modify the Pilot TV37 for 405 lines?
Receiver has an electrostatic deflection CRT so no difficulties modifying the timebases for 405/50.

https://www.radiomuseum.org/r/pilot_candid_tv_tv37.html

DFWB.
Actually, I was just being stupid. (As usual. Thanks Dave.) I can send 625 via my VHF modulator to my 9-90 and it displays perfectly on VHF so I was befuddled when the Casio had problems with the same aerial signal. The real explanation is that the 9-90 is happy with VHF 625 positive modulation but of course the Casio only expects to see negative modulation.

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Old 21st Nov 2020, 1:32 pm   #12
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Default Re: 3” screen 405 line portable Tv

Quote:
Originally Posted by dazzlevision View Post
I have a Sinclair leaflet from the second half of the 1960s advertising their first Microvision TV, which (IIRC) was for the VHF/405 standard. Of course, it may never have gone into commercial production.....
Here's the leaflet:
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Old 21st Nov 2020, 4:23 pm   #13
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Default Re: 3” screen 405 line portable Tv

Hi.
The original sinclair microvision never was released.
Here is an article with more information.
http://rk.nvg.ntnu.no/sinclair/televisions/tv1a.htm
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Old 21st Nov 2020, 5:29 pm   #14
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Default Re: 3” screen 405 line portable Tv

I had a TV1A, it is now residing at the Dulwich museum.
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Old 21st Nov 2020, 6:20 pm   #15
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Default Re: 3” screen 405 line portable Tv

I had a Mon 1A, very useful at the time for just checking for the presence of baseband video. It meant that I could quickly check & identify video sources, without lugging around a large mains-powered video monitor.

With a magnifier, you could just about read printed text! I seem to recall that the battery consumption was quite high.

Dave.
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Old 23rd Nov 2020, 2:13 pm   #16
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Default Re: 3” screen 405 line portable Tv

"... It functioned on VHF and UHF bands and was the first-ever multi-standard receiver, which meant that it could be used in nearly every foreign country as long as the country used one of the three major TV standards..."

More specifically; which standards?
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Old 23rd Nov 2020, 5:36 pm   #17
jhalphen
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Default Re: 3” screen 405 line portable Tv

Hi to all,
Hi Brigham,

It worked on :
- USA, M standard, 525, FM audio, 4.5 MHz
- Europe, B/G standard, 625, FM audio, 5.5 MHz
- UK, I standard, 625, FM audio, 6.0 MHz

Best Regards
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Old 23rd Nov 2020, 11:07 pm   #18
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Default Re: 3” screen 405 line portable Tv

Quote:
Originally Posted by peter_scott View Post
I can send 625 via my VHF modulator to my 9-90 and it displays perfectly on VHF so I was befuddled when the Casio had problems with the same aerial signal. The real explanation is that the 9-90 is happy with VHF 625 positive modulation but of course the Casio only expects to see negative modulation.

Peter

"VHF" System A
"UHF" System I

Both in System I, VHF
Both unlatched System A, UHF

Two nice undocumented features!

The fact that the 9-90 dual standard set and not merely dual band is not obvious unless you actually RTFM.
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Last edited by rambo1152; 23rd Nov 2020 at 11:28 pm.
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Old 24th Nov 2020, 1:53 pm   #19
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Default Re: 3” screen 405 line portable Tv

Quote:
Originally Posted by rambo1152 View Post

Both in System I, VHF
Both unlatched System A, UHF

Two nice undocumented features!
A story I've told before. At Network Control 2 (for BBC2) at Television Centre, where all the various sources were linked into one service, we used a Sony 9-90 for our off-air monitor. It showed the output from Crystal Palace Ch.33.

At the time I had noticed the feature Rambo mentions. (Actually I think you'll find it works the other way round.) During one idle moment during a Trade Test Transmission I wondered if the complete 625-line UHF chain would handle a 405-line signal. So I pushed both buttons in on the Sony, which now was primed to display a 405-line picture on UHF, and went back to the Mixer Desk, where I selected 405-line Test Card D as a source. Then I 'punched it up' through the mixer.

It all worked perfectly! 405 on Ch 33 UHF from CP (and all the other national transmitters). I only risked leaving it for a couple of seconds though, otherwise alarm calls would have started coming in. Possibly also 'calls' on my job!

Steve
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Old 25th Nov 2020, 8:36 am   #20
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Default Re: 3” screen 405 line portable Tv

About 30 years back I was using a TV9-90 for DX on vhf/625, where the -ve video
demodulator output is used. I had noticed some strong signals with inverted video.
Using a simple spdt switch I was able to switch to the +ve video demodulator and view
these signals which were in fact Canal+ from the transmitter in Corsica.
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