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35 posts

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Topic # 189133 17-Dec-2015 20:40
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Hi geeks,

I'm playing around with an old early 80's Sanyo TV - boombox hybrid machine that I was given by a mate as I love retro tech. Is it possible to still find any broadcasts on VHF frequencies in NZ or have they all gone UHF now ? My box seems to have a connection point for a VHF aerial (in addition to the built-in one) and there's a space on the back for UHF but no actual connection points.

If there aren't any VHF channels left, could I 'send' a signal to the box via a transmitter (like a video sender type thing) to test the TV tube ?

Thanks heaps for any help on this :-)

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  Reply # 1452642 17-Dec-2015 21:01
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there are no VHF or UHF any more (as far as I'm aware).
Everything has gone digital.
you could get a freeview box to plug into the old TV.
If you just want to test the tube out just plug in a DVD player or old VCR



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Geek


  Reply # 1452655 17-Dec-2015 21:27
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Thanks for the speedy reply mate - it's an old box and has no video input (only line in ) so can't get a video source into it to test. Never mind, I'll keep experimenting :-)

 
 
 
 


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Ultimate Geek
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  Reply # 1452657 17-Dec-2015 21:30
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A old vcr would work

failing that if you can find a modulator then any av signal





 The views expressed by me are not necessarily those of my employer


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  Reply # 1452692 17-Dec-2015 21:40
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I think some Freeview receivers have an RF output that you could use?

It would be cool if you could post a photo of it, just for those of us who are curious this old piece of kit!

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Ultimate Geek
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  Reply # 1452697 17-Dec-2015 21:45
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markoneswift: Hi geeks,

I'm playing around with an old early 80's Sanyo TV - boombox hybrid machine that I was given by a mate as I love retro tech. Is it possible to still find any broadcasts on VHF frequencies in NZ or have they all gone UHF now ? My box seems to have a connection point for a VHF aerial (in addition to the built-in one) and there's a space on the back for UHF but no actual connection points.

If there aren't any VHF channels left, could I 'send' a signal to the box via a transmitter (like a video sender type thing) to test the TV tube ?

Thanks heaps for any help on this :-)


You mean to see if the tube still works? Have you tried just turning it on to see if you get a bunch of static 'white noise'?

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  Reply # 1452698 17-Dec-2015 21:50
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Most modulators are UHF in the boxes.

Jaycar had a VHF one when I last looked, Or find a really old VHS deck, before they started putting UHF modulators in them.

Just dont order a $4 modulator off aliexpress and expect it to be electrically safe ;)




Richard rich.ms



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  Reply # 1452707 17-Dec-2015 22:10
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Here's a link to my post on Boomboxery about the unit......
http://boomboxery.com/forum/index.php/topic/24478-is-this-old-sanyo-unit-worth-a-shot/

The tube does work, I do get white noise. I should have said that I'm trying to test actually getting a picture on it.

Thanks again guys.

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Ultimate Geek
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  Reply # 1452746 18-Dec-2015 00:10
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Unless you can find an old VCR that outputs on VHF band, (not UHF as most equipment does these days), AND it's still in working condition with something to play in it, then your best bet is one of these:

http://www.jaycar.co.nz/Sight-%26-Sound---Home/AV-Switchers-%26-Converters/Converters/Stereo-Audio-and-Video-RF-Modulator/p/LM3880 

or this

http://www.dishtv.co.nz/vmchk/Accessories/137-AV-to-RF-Modulator/flypage_web2_lite.tpl.htm 





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