SAW Filters - pictures - Page 1
Forum section: electronics / projects

author: mister_rf
author_rank: Contributor
timestamp: January 20, 2023, 10:24:46 pm
content: Siemens OFW G1961IF Filter for Intercarrier applications. TV IF filter with Nyquist slope and sound shelf.Standard B/GPicture carrier to sound carrier distance 5.5MHzSound carrier 20 dBColour carrier 3.7dBPicture carrier 38,90 MHz.Package SIP5K

author: Benta
author_rank: Super Contributor
timestamp: January 20, 2023, 10:41:23 pm
content: Beautiful pictures.Thanks.

author: mister_rf
author_rank: Contributor
timestamp: January 21, 2023, 09:10:45 pm
content: Siemens OFW G3201This dual output SAW IF filter is used in the Quasi-Parallel System (Split Carrier System) receivers.Picture IF carrier 38,90 MHz.Sound IF carrier 33.4 MHz.Standard B/GPackage DIP10Manufactured by Siemens, 1980s.

author: mister_rf
author_rank: Contributor
timestamp: January 22, 2023, 08:38:06 am
content: F1034ASSAW IF Filter for Intercarrier applications - TV IF filter with Nyquist slope and sound shelf.Standard B/GPicture carrier to sound carrier distance 5.5MHzPicture carrier 38,90 MHz.Manufactured by Toshiba, 1990s.

author: BrianHG
author_rank: Super Contributor
timestamp: January 22, 2023, 10:56:57 am
content: Quote from: mister_rf on January 21, 2023, 09:10:45 pmHmm, in Europe, the audio is 5.5Mhz below the picture carrier.Here in North America, we have out picture carrier 4.5Mhz above the picture carrier.Also, we don't have a separate SAW filter for the sound IF, we usually extract if from the baseband video with a 4.5Mhz band pass IF and have a 4.5Mhz trap to remove the audio carrier from the baseband video.

author: BrianHG
author_rank: Super Contributor
timestamp: January 22, 2023, 11:05:23 am
content: Quote from: mister_rf on January 21, 2023, 09:10:45 pmWow, take a look at those trace laser-like cuts in a 2x superimposed sine pattern for that narrow-band sound IF output.

author: voltsandjolts
author_rank: Unknown
timestamp: January 22, 2023, 11:11:55 am
content: @mister_rfThese photos are fantastic quality, what photographic equipment did you use?

author: mister_rf
author_rank: Contributor
timestamp: January 23, 2023, 07:34:54 am
content: Quote from: voltsandjolts on January 22, 2023, 11:11:55 amCamera: Canon EOS R7; Lens: Canon RF 100mm F/2.8L Macro; fixed camera on tripod, no rails; for each final picture a large number of pics (up to 100 – 250) combined into one in Helicon Focus, edited in PS.On topicF1057ː IF Filter for Intercarrier applications - TV IF filter with Nyquist slope and sound shelf;Standard B/G;Picture carrier to sound carrier distance 5.5MHz;Picture carrier 38,90 MHz;.Manufactured by Toshiba, 1980s.

author: BrianHG
author_rank: Super Contributor
timestamp: January 23, 2023, 07:45:26 am
content: Do you have any NTSC saw filters?What about narrow band ones like those used in analog Cellular telephones?Or, old 2M ham radio ones?

author: jahonen
author_rank: Super Contributor
timestamp: January 23, 2023, 01:42:49 pm
content: Quote from: BrianHG on January 22, 2023, 10:56:57 amActually, pretty much anywhere, the mono analog carrier was above the picture carrier as transmitted. 5.5 MHz in many European countries including Finland. That 38.9 / 33.4 MHz order is just how tuner works and which of the mixing products you use. Thus the transmitted frequency spectrum is inverted if you chose the mixing product where fIF = fLO-fRF, as you would want to keep RF system as simple as possible.That sound carrier separation after video demodulation was used quite frequently when mono audio was only one available. But whenA2 stereoand digitalNICAMstereo came along in late 80's or early 90's, when it became usual to separate the sound before the video demodulation to improve sound quality.German A2 stereo was trialed here in Finland, but then we decided to use digital NICAM stereo instead (companded 14 bits @ 32 kHz).Regards,Janne

author: mister_rf
author_rank: Contributor
timestamp: February 01, 2023, 12:32:29 pm
content: Kyocera 38.9MNː IF Filter for Intercarrier applications - TV IF filter with Nyquist slope and sound shelf;Standard B/G;Picture carrier to sound carrier distance 5.5MHz;Picture carrier 38,90 MHz;.Manufactured by Kyocera, 1990s.

author: RoGeorge
author_rank: Super Contributor
timestamp: February 01, 2023, 01:48:12 pm
content: SAW what you photographed there!Subscribed, thanks.