Aztex Electronics TVTX 24 Transmitter

Ideas, technical topics, help and discussion for ATV enthusiasts
Forum rules
This forum is run by the BATC (British Amateur Television Club), it is service made freely available to all interested parties, please do not abuse this privilege.

Thank you
M0YDH
Posts: 134
Joined: Sat Dec 31, 2016 5:59 pm

Aztex Electronics TVTX 24 Transmitter

Post by M0YDH » Fri Dec 28, 2018 11:44 am

Hello all
I spent the late afternoon yesterday at my TV neighbour Dave G7MEG 's shack. He lent me the above FM ATV transmitter to investigate. He has bought lots of kit from Harold Bent G0EZW of Nottingham some years ago. This is from that sale. Nowt on the internet and it's a likely candidate for a new BATC wiki page.

Crystals are 4.90295 and 4.87891 MHz

Does anyone know about this unit and / or have information like the owner's manual please?

All the best
David M0YDH
Attachments
PhotoPictureResizer_181228_111450099-1008x756.jpg
TVTX 24
PhotoPictureResizer_181228_111450099-1008x756.jpg (187.08 KiB) Viewed 600 times
PhotoPictureResizer_181228_112302545-1008x756.jpg
PhotoPictureResizer_181228_112302545-1008x756.jpg (230.65 KiB) Viewed 601 times
PhotoPictureResizer_181228_111528275-1008x756.jpg
PhotoPictureResizer_181228_111528275-1008x756.jpg (202.7 KiB) Viewed 601 times

g0mjw
Posts: 713
Joined: Sat Sep 20, 2014 9:15 am

Re: Aztex Electronics TVTX 24 Transmitter

Post by g0mjw » Fri Dec 28, 2018 12:23 pm

From the date codes early 1990s - so naturally I looked up the CQ-TV archives. I am hoping nobody will mind my adding a screen shot of the advertisement in CQTV-160. This says there is a review in CQTV-150 but I can't find that issue in the archive.
Attachments
Capture1.JPG
Capture1.JPG (88.41 KiB) Viewed 591 times

M0SKM
Posts: 199
Joined: Sun Jul 13, 2014 3:15 pm

Re: Aztex Electronics TVTX 24 Transmitter

Post by M0SKM » Fri Dec 28, 2018 12:34 pm

If CQ-TV 150 is not added to downloads I have the .pdf here.

Steve

M0YDH
Posts: 134
Joined: Sat Dec 31, 2016 5:59 pm

Re: Aztex Electronics TVTX 24 Transmitter

Post by M0YDH » Fri Dec 28, 2018 1:08 pm

Thanks both. Steve sent me a pdf if CQ-TV 150 with the full review and measurements. Plenty to read after watching today's rugby match.
73
David M0YDH

g4bvk
Posts: 3
Joined: Wed Mar 01, 2017 6:48 pm

Re: Aztex Electronics TVTX 24 Transmitter

Post by g4bvk » Fri Dec 28, 2018 4:03 pm

Hi Dave,

Aztex Electronics was my company and I ran the business for around five years and finally stopped trading around 1993. Not sure how many transmitters I made over that time, but it would be in the order of 50-60 units. I already had a full time job and Aztex Electronics was done in my spare time. Unfortunately, the business became too successful and I just could not keep up with orders, so sadly, I decided to close the business.

Most of the units came with two output channels, 1249 and 1255 MHz. with a divide factor 256.

What seems to be the problem with the transmitter you have there?

Regards,

Ken G4BVK

M0YDH
Posts: 134
Joined: Sat Dec 31, 2016 5:59 pm

Re: Aztex Electronics TVTX 24 Transmitter

Post by M0YDH » Fri Dec 28, 2018 4:47 pm

The main problem is usually me not knowing anything about ATV, Ken! :oops: I've had the unit 1 day so far. The forum has given me lots of info in a short few hours. I shall get it going and look for a signal on my SDR receiver when time allows. Then connect the Portsdown video output to its video in rather like with the 6cm drone gear and point the aerial at Mow Cop GB3UD. I can watch the streamer channel for my test card. Dave might have an analogue tv receiver in the cupboard which would be easier.

Thanks for the offer. I will report back what happens.

73

David M0YDH

g4bvk
Posts: 3
Joined: Wed Mar 01, 2017 6:48 pm

Re: Aztex Electronics TVTX 24 Transmitter

Post by g4bvk » Fri Dec 28, 2018 5:06 pm

Make sure you have the RF output terminated into an antenna or a 50 ohm load, otherwise you could damage the output module. The output power can be anything between 1-4 Watts, depending how the thing is setup.

Ken G4BVK

M0YDH
Posts: 134
Joined: Sat Dec 31, 2016 5:59 pm

Re: Aztex Electronics TVTX 24 Transmitter

Post by M0YDH » Fri Dec 28, 2018 5:41 pm

Thanks Ken. I have a reasonable yagi and a 50 ohm dummy load for my 23cm DATV station. Your customer Mr Bent wrote 1.5W on a paper label on the bottom face. Dave has a power meter for the band that I can borrow. It could turn out very well. I've read the CQ-TV 150 article where the impressed reviewer bought the unit after the review.
😀

g8gtz
Posts: 1059
Joined: Wed Apr 07, 2010 6:26 pm

Re: Aztex Electronics TVTX 24 Transmitter

Post by g8gtz » Fri Dec 28, 2018 9:18 pm

OK - spurred on by this I have just added issue 120 to 150 to the CQ-TV archives ( we do have them all, just need time to upload them).

Don't forget there is an index which you can search on the wiki and would have found Aztec - BTW we need someone to complete the index (nice Christmas project?).... https://wiki.batc.org.uk/1988_-_1992_CQ ... _CQ-TV_160

Will upload the rest tomorrow - off to see who got murdered in Exeter or was it Epping or Enfield...

73
Noel

cashy666
Posts: 39
Joined: Mon Aug 10, 2015 9:53 pm

Re: Aztex Electronics TVTX 24 Transmitter

Post by cashy666 » Sat Dec 29, 2018 7:06 pm

Hi all,
I think I also have the Amp and Pre amp...
20181229_161819.jpg
20181229_161819.jpg (1.17 MiB) Viewed 425 times
20181229_161809.jpg
20181229_161809.jpg (1.15 MiB) Viewed 425 times
20181229_162103.jpg
20181229_162103.jpg (1.45 MiB) Viewed 425 times
....

pre amp to follow...

Dave
G7MEG

Post Reply

Return to “General ATV Discussion”