(continues)
The "operation" is quite simple.
The "combo" provides the best of both kits: The overload-insensitive RF front end of the LH7254 and the better IF and AF-Stereo section of the LH7255. I enjoy it for a few months now.
If anyone is interested, you may contact Tamas for avaliability and price. He is a very helpful person, and although a keen proffessional designer, he does not hesitate to discuss in detail with amateurs (like me).
I can supply details for the interconnections if needed.
Regards
George
The "operation" is quite simple.
The "combo" provides the best of both kits: The overload-insensitive RF front end of the LH7254 and the better IF and AF-Stereo section of the LH7255. I enjoy it for a few months now.
If anyone is interested, you may contact Tamas for avaliability and price. He is a very helpful person, and although a keen proffessional designer, he does not hesitate to discuss in detail with amateurs (like me).
I can supply details for the interconnections if needed.
Regards
George
I am waiting to try this:
http://www.sangean.com/products/hdt1.php
I use their ATS 909 portable for roadtrips and camping weekends.
It's FM stereo section is fantastically good. It seems this company
has been doing radio for a long time.
-- Jim
http://www.sangean.com/products/hdt1.php
I use their ATS 909 portable for roadtrips and camping weekends.
It's FM stereo section is fantastically good. It seems this company
has been doing radio for a long time.
-- Jim
Now this looks like an interesting FM IC at http://www.atmel.com/dyn/resources/prod_documents/doc4807.pdf .
This is a new IC, the copyright on the specification sheet is 2004.
Regards,
Ray
This is a new IC, the copyright on the specification sheet is 2004.
Regards,
Ray
The company is out of business, but this looks like an interesting FM receiver module at http://www.compolinc.com/FM-24_product_specs.htm .
Regards,
Ray
Regards,
Ray
Can I ask Forr (or any one else) to email me the John Linsley-Hood Stereo decoder schematics he has,
to martin.willment@hotmail.com.
I have a mono Leak Troughline III tube Tuner that needs a stereo decoder. Any advice would be most welcome.
Regards
Martin
to martin.willment@hotmail.com.
I have a mono Leak Troughline III tube Tuner that needs a stereo decoder. Any advice would be most welcome.
Regards
Martin
Hello Martin
If you would like an IC implementation of a decoder, here is a very good site. It is in German, but you will understand the drawings. He has integrated in a self made tube tuner. When you enter the site, at the left rolling column, click over the "Das UKW Project"
http://www.jogis-roehrenbude.de/
Regards
If you would like an IC implementation of a decoder, here is a very good site. It is in German, but you will understand the drawings. He has integrated in a self made tube tuner. When you enter the site, at the left rolling column, click over the "Das UKW Project"
http://www.jogis-roehrenbude.de/
Regards
AM FM tuner
Hi Forr,
Thanks for responding. I have been out of touch for a while.
e-mail is
ifreeman@thot-tech.com
THis is my work e-mail. I am still a new kid on the block so I cannot e-mail from the forum yet. Please do not overuse the work
e-mail until I can get established.
BTW do you have the Linsley Hood AM PLL scematics also?
Hi Forr,
Thanks for responding. I have been out of touch for a while.
e-mail is
ifreeman@thot-tech.com
THis is my work e-mail. I am still a new kid on the block so I cannot e-mail from the forum yet. Please do not overuse the work
e-mail until I can get established.
BTW do you have the Linsley Hood AM PLL scematics also?
More IC information
I scanned through the threads and I have information:
1). The MC1310P sttereo decoder chip is available as the NTE801
2). The CA3089 is available as NTE788
3). The CA3189 is available as NTE7016
All these are current from www.mouser.com
4). Try the SA615 from NXP (formally Philips). This is a current Mixer-IF-limiter chip (similar to the CA3189) and appears to have better specs. Available from www.digikey.com
The prices for these are very reasonable
I scanned through the threads and I have information:
1). The MC1310P sttereo decoder chip is available as the NTE801
2). The CA3089 is available as NTE788
3). The CA3189 is available as NTE7016
All these are current from www.mouser.com
4). Try the SA615 from NXP (formally Philips). This is a current Mixer-IF-limiter chip (similar to the CA3189) and appears to have better specs. Available from www.digikey.com
The prices for these are very reasonable
Although I have studied a number of commercially available designs, I would never attempt to build a tuner just for fun. Hats off to those who do.
You see, the standards even for relatively entry-level tuners are pretty high, particularly over here in Europe where 4-gang 3-filter sets are very common (whereas the folks in the States frequently have to make do with 3-gang frontends and two IF filters). I recently saw a perfectly fine Onkyo T-4450 (T-4150) 4-gang 4-filter tuner with FM IF bandwidth selection (2x 230 kHz GDT for wide + another 2x 150 for narrow) go for a song...
Some general recommendations:
Check out fmtunerinfo.com and the FMtuners Yahoo! Group, as well as Brian Beezley's site.
Look for more modern/advanced IC designs. The 1310 is really long in the tooth by now, dating back to 1973 or so (one of the very first chips that did away with tuned inductors), and does have its shortcomings - for example, on some stations it refuses to switch into stereo (probably low pilot tone level). Sanyo ICs in particular seem to be worth a look. For example, at a popular dealer here in Germany I could still order LA1235 (FM IF), LA1266 (FM/AM IF) (as well as LA1260 and 1265) and LA3401 (good "2nd-row" MPX from the '80s). In terms of Philips, there's the TDA1591 (usable MPX) and the TDA1072 (AM RF/IF). The uPC1161C3 long used in basic Onkyo tuners crossreferences to HA1196 or HA12016, I forgot which - in any case these also are stereo decoders worth looking out for.
MPX chips with 38k 3rd harmonic suppression (these generally are the best ones) seem to have vanished for the most part, though it seems like one can still get the odd TCA4500A in the States. GDT filters also are problematic, they are no longer being made, at least lead types. Hand matching those types that are available with regard to center frequency becomes all the more important.
You see, the standards even for relatively entry-level tuners are pretty high, particularly over here in Europe where 4-gang 3-filter sets are very common (whereas the folks in the States frequently have to make do with 3-gang frontends and two IF filters). I recently saw a perfectly fine Onkyo T-4450 (T-4150) 4-gang 4-filter tuner with FM IF bandwidth selection (2x 230 kHz GDT for wide + another 2x 150 for narrow) go for a song...
Some general recommendations:
Check out fmtunerinfo.com and the FMtuners Yahoo! Group, as well as Brian Beezley's site.
Look for more modern/advanced IC designs. The 1310 is really long in the tooth by now, dating back to 1973 or so (one of the very first chips that did away with tuned inductors), and does have its shortcomings - for example, on some stations it refuses to switch into stereo (probably low pilot tone level). Sanyo ICs in particular seem to be worth a look. For example, at a popular dealer here in Germany I could still order LA1235 (FM IF), LA1266 (FM/AM IF) (as well as LA1260 and 1265) and LA3401 (good "2nd-row" MPX from the '80s). In terms of Philips, there's the TDA1591 (usable MPX) and the TDA1072 (AM RF/IF). The uPC1161C3 long used in basic Onkyo tuners crossreferences to HA1196 or HA12016, I forgot which - in any case these also are stereo decoders worth looking out for.
MPX chips with 38k 3rd harmonic suppression (these generally are the best ones) seem to have vanished for the most part, though it seems like one can still get the odd TCA4500A in the States. GDT filters also are problematic, they are no longer being made, at least lead types. Hand matching those types that are available with regard to center frequency becomes all the more important.
Yes, it is more complicated to build a good tuner than a good amp. But it is manageable.
The first tuner that one builds may be not better than a commercial unit, but the same holds true for the first amp that one builds.
I think that there are two strong points doing RF-diy:
1. Dealing with RF, man earns a wealth of technical knowledge, theoretical and practical.
2. Receivers as well as transmitters are communication tools. They are a window to far “out-there” worlds. This itself is fascinating.
Regards
George
The first tuner that one builds may be not better than a commercial unit, but the same holds true for the first amp that one builds.
I think that there are two strong points doing RF-diy:
1. Dealing with RF, man earns a wealth of technical knowledge, theoretical and practical.
2. Receivers as well as transmitters are communication tools. They are a window to far “out-there” worlds. This itself is fascinating.
Regards
George
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