UK Vintage Radio Repair and Restoration Powered By Google Custom Search Vintage Radio and TV Service Data

Go Back   UK Vintage Radio Repair and Restoration Discussion Forum > Specific Vintage Equipment > Television Standards Converters, Modulators etc

Notices

Television Standards Converters, Modulators etc Standards converters, modulators anything else for providing signals to vintage televisions.

Closed Thread
 
Thread Tools
Old 26th Nov 2023, 2:28 pm   #1
Freya
Octode
 
Freya's Avatar
 
Join Date: Jan 2009
Location: Falmouth, Cornwall, UK.
Posts: 1,988
Default Hedghog Standards Converters

Ready made Hedghog Standards Converters available, please use the forum to PM or Email for prices.

(the spelling of Hedghog is intentional throughout)

Hedghog 1

Features:
Converts between aspect ratios of 4:3 => 4:3, 4:3 => 5:4, 16:9 => 4:3 and 16:9 => 5:4.
Pedestal (lifts black level 50 mV above blanking level)
Normal broad pulses or broad pulses with equalising pulses
Soft, medium and sharp interpolation apertures
Audio test tones of 400Hz and 1KHz
Test card and grey scale
13 Channel RF out covering Band l and lll (system A)
Composite video input
405 line video out (1VPP)

Requires 7.5 to 9 V DC at 250 mA (Not Supplied)

Hedghog 2 (special order only)

The Hedghog II has all the features of Hedghog with the following differences.
Single PCB.
The FPGA is changed
The DAC is changed from 9 bit to a 10 bit.
It can be used as a System A modulator.
The video out socket is moved to the back panel to make room for an additional toggle switch on the front.
Composite video input
Requires 7.5 to 9 V DC at 250 mA (Not Supplied)

405 to 625 line Option:
With optional firmware the 625 to 405 converter works as before with the substitution of the interpolation apertures switch, this now becomes the 625 to 405/405 to 625 switch.
In 405 to 625 mode the converted 625 video is available on the video out socket. The incoming 405 video is fed to the system A modulator so that it can be monitored on a 405 TV if required. (This option only works well with a perfectly stable 405 signal, most VCR equipment will NOT provide this).

Hedghog L
Features:
LCD Display
405/819 line standards converter combined with a stand-alone multi system programmable VHF/UHF modulator.
aspect ratio conversion 4:3 => 4:3, 4:3 => 5:4, 16:9 => 4:3, 16:9 => 5:4
Selectable equalising pulses when converting to 405 lines
405 line Test card
Composite video input
Requires 7.5 to 9 V DC at 250 mA (Not Supplied)

Modulator Features
Frequency coverage 28.5 to 900 MHz in 5 ranges
Frequency ranges and step:
28.5 to 56.25 MHz step 15.625 KHz
56.25 to 112.5 MHz step 31.250 KHz
112.5 to 225 MHz step 62.500 KHz
225 to 450 MHz step 125 KHz
450 to 900 MHz step 250 KHz
Selectable negative video FM sound or positive video AM sound
Selectable vision/sound carrier separation of 4.5, 5.5, 6.0 and 6.5 MHz or when in positive video AM sound mode the video and sound carriers can be set independently(Variable mode)
Selectable picture/sound carrier ratio of 12 and 16 dB or fixed at 6dB when in Variable mode
Can be used as a stand alone modulator


Hedghog PSC (Programmable Standards Converter)

Features:
LCD Display
Field frequencies of 25, 30, 50 and 60 Hz
Number of lines between 16 and 830
Number of active lines(lines with picture information) between 8 and 800
Adjustable length of front porch, line sync, back porch and broad pulse.
Number of broad pulses between 1 and 50.
Sync height of 20, 25, 30, 35, 40, 45 and 50%
Independent left and right crop
Selectable equalising pulses
Test patterns: Test card, Grey scale, Crosshatch, Cruciform, Black screen, White screen
Composite video input
Requires 7.5 to 9 V DC at 250 mA (Not Supplied)

Modulator Features:
Frequency coverage 28.5 to 900 MHz in 5 ranges
Frequency ranges and step:
28.5 to 56.25 MHz step 15.625 KHz
56.25 to 112.5 MHz step 31.250 KHz
112.5 to 225 MHz step 62.500 KHz
225 to 450 MHz step 125 KHz
450 to 900 MHz step 250 KHz

Selectable negative video FM sound or positive video AM sound
Selectable vision/sound carrier separation of 4.5, 5.5, 6.0 and 6.5 MHz or when in positive video AM sound mode the video and sound carriers can be set independently(Variable mode)
Selectable picture/sound carrier ratio of 12 and 16 dB or fixed at 6dB when in Variable mode
Can be used as a stand alone modulator.

Special thanks to Frank Cuffe, whom without his hard work none of this would not be possible.

Ready made Hedghog Standards Converters available, please use the forum to PM or Email for prices.
Attached Thumbnails
Click image for larger version

Name:	20231126_122602.jpg
Views:	176
Size:	34.9 KB
ID:	288802   Click image for larger version

Name:	hh2.jpg
Views:	159
Size:	27.6 KB
ID:	288803   Click image for larger version

Name:	hhl.jpg
Views:	184
Size:	23.9 KB
ID:	288805   Click image for larger version

Name:	psc.jpg
Views:	170
Size:	21.5 KB
ID:	288806   Click image for larger version

Name:	back.jpg
Views:	155
Size:	40.0 KB
ID:	288807  

__________________
Stephen
_________"It`s only an old telly" ___
Freya is offline  
Closed Thread

Thread Tools



All times are GMT +1. The time now is 2:23 pm.


All information and advice on this forum is subject to the WARNING AND DISCLAIMER located at https://www.vintage-radio.net/rules.html.
Failure to heed this warning may result in death or serious injury to yourself and/or others.


Powered by vBulletin®
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Copyright ©2002 - 2023, Paul Stenning.