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   Home » Off Air Audio» Rohde & Schwarz EU-6201 Tuner (35 posts, 2 pages)
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  »  New  Where are our good Tuners?..  Ok, it did clear the things up....  Off Air Audio Forum     43  273647  03-31-2008
  »  New  The FM Stereo and Multiplex MPX decoders..  The new life of Rohde & Schwarz decoder....  Off Air Audio Forum     12  106883  05-02-2008
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  »  New  A tube tuner? REL Precedent 646C..  REL Precedent Report...  Off Air Audio Forum     24  180239  07-28-2008
  »  New  Align your FM tuners!..  The Munich technician?...  Off Air Audio Forum     7  62074  03-27-2006
  »  New  Forward in the past with old radios...  Kitchen radio as a source of immense pleasure....  Off Air Audio Forum     18  101948  01-21-2011
12-18-2009 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,535
Joined on 05-28-2004

Post #: 26
Post ID: 12506
Reply to: 7369
Bye-bye Rohde & Schwarz
fiogf49gjkf0d
One of my Rohde & Schwarz EU-6201 tuners with a matching Rohde & Schwarz MSDC MPX decoder is going away tomorrow. I was contemplating for a while I decided to let one of my Schwarz sets to do. I left with one EU-6201/MSDC2 decoder and Sansui TU-1X that dally keep competing for 99.5MHz reception. One day Schwarz get better reception another day Sansui – the weather condition do affect the things. I am kind of sad to let one of my Schwarzs to go, particularly the MSDC decoder – it is too comfortable thing with fenominal indication. I do not let it got for sake of money but I just feel that I have too many of those devises and that I never will be using the second Schwarz set, So, why to store those things? Some additional sadness I feel in the fact that the guy who buy my Schwarz is not truly FM connoisseur and I feel that he is not truly understand what kind FM setup he is getting. I would like to see this set go in the hands of a seasoned FM person who would fully appreciate the thighs. There were so many efforts spent on this decoder and this tuner that it would be nice if the new owner would be able to realize the result. Well, you know how it works…

Anyhow, bye-bye Rohde & Schwarz, it was very good for me but how much land a man need? Here is the last shot.....

Rohde & Schwarz_Last_Shot.JPG




"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
11-14-2010 Post does not mapped to Knowledge Tree
sm3xcs
Sweden
Posts 1
Joined on 11-14-2010

Post #: 27
Post ID: 14940
Reply to: 7369
Rohde & Schwarz EU6201 Schematics
fiogf49gjkf0d
Hello, anyone have or know where to find a full schematics / Service manual (PDF) to Rohde & Schwarz EU6201 FM tuner?
I have only found a blockdiagram, but no schematics.

Regards
Thomas
11-14-2010 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,535
Joined on 05-28-2004

Post #: 28
Post ID: 14941
Reply to: 14940
Google them...
fiogf49gjkf0d
Thomas, there are a few companies in Germany that sell it for 60 Euros or so. I do not remember the company name that I used but they are googalable, you shall be able to find it.


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-01-2011 Post does not mapped to Knowledge Tree
zako
Posts 85
Joined on 05-25-2008

Post #: 29
Post ID: 15524
Reply to: 14941
TUNER Roahde & Schwarts
fiogf49gjkf0d
There is a "NEW" Roahde & Schwarz Tuner on EBAY today,,,$3600,,sourced out of Isreal,,  cant make out the mod number,,,Should i bid????
02-01-2011 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,535
Joined on 05-28-2004

Post #: 30
Post ID: 15526
Reply to: 15524
Rohde & Schwarz vs. Rohde & Schwarz
fiogf49gjkf0d

 zako wrote:
There is a "NEW" Roahde & Schwarz Tuner on EBAY today,,,$3600,,sourced out of Isreal,,  cant make out the mod number,,,Should i bid????

Hm, this is the type a question that I was not asked for a while!

Zako, I do not know this receiver. I know the Rohde & Schwarz EU6201, the one that is up for sale is EU200, I have no idea what it is. From the picture it looks like has a different front end. I do not know what purpose was for this unit and what topology it used. This EU200 is from end 70s, Rohde & Schwarz made super cool communication receivers in end 80s. I was approached with one it was bout $5K and it was 4U large unit with enormous amount of functionality and tuning options. I decided to pass is as I had no use for it. This EU200 unit might be a good tuner or it might be just a good communication recessive.  If it has a fantastic selectively by narrowing IM bandwidth then you will hard get from it a good quality sound. Whatever it is you would need to invest some efforts to it to modify it out stage as it is not up to the demands of the best tuners. You would also need a good multiplex decoder.  Still I would not go for the EU200 until I know certainly what it is and what topology it uses. The only this that I can assure you that whatever topology it has it will be very well made. Call to Rohde & Schwarz, find some senior person who work in there for a while and talk to him/her.

I think it all boil doe how interesting FM in your region.  If you have a worthy FM station then you might try to experiment with Schwarz. Be advised that no one will be able to alight it in this country.  Well, aligned EU6201, modified, and driving by own preamp a properly voiced multiplex decoder might sound as good as classic tuners theoretically can. I do not know anything about EU200 and to make assumptions only by the company name I would not recommend.

Rgs, Romy the Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
02-01-2011 Post does not mapped to Knowledge Tree
Paul S
San Diego, California, USA
Posts 2,144
Joined on 10-12-2006

Post #: 31
Post ID: 15527
Reply to: 15524
Programming???
fiogf49gjkf0d
Zako, the first order of business is programming; ie, what sort of music could you enjoy, best case?  In my own situation, the quality of the tuner is the least of my problems!

I am getting to the point where I wonder if computer-sourced program might be a better gambit for me than FM.

Best regards,
Paul S
02-01-2011 Post does not mapped to Knowledge Tree
zako
Posts 85
Joined on 05-25-2008

Post #: 32
Post ID: 15531
Reply to: 15527
R&S fm tuner
fiogf49gjkf0d
I am sandwitch,d between two cities,,,and use a antenna roter,,to captuer most of my classicle needs,,,But i,m on the fringe,,and a good tower antenna keeps me connected,,,So i,ll probably not bite on this one...   I,ll probably waite for some thing closer..Like a used Accuphase,,,   thank you for your advice....     Maron
08-15-2011 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,535
Joined on 05-28-2004

Post #: 33
Post ID: 16832
Reply to: 7369
Where to get custom crystal oscillators.
fiogf49gjkf0d
With the coming of the new director to WCRB (Benjamin Raw) the station, without any big hooplas and announcements of “perestroika”, kind of surreptitiously, is turning out to be a truly fine classical station. There are ton of things that they do nowadays that is very welcoming in my view, which makes the FM junkies like me immensely happy. So, with great advancement of WCRB programming and since a lot of my listening is FM programs I took some measured to beef up my FM capacity. A new antenna, a new way to tune my directional antenna to the stations to name a few, the last one that I would like to try is to switch my Rohde & Schwarz to work not from own local  oscillator to quartz oscillator.

Sonically, the TU-1X with modified multiplex and modified Schwarz with own modified multiplex are not distinguishable. The reception is different matter. In my old location what different in reception was very minor (with TU-1X manually attenuated) but my new location has much more complex reception situation. The WCRB I can get as clean as the best CD with noise at the level of the station transmitters capacity. The WHRB is more complicated and I still work on it. In any case it looks like with all tricks I use the TU-1X does better job with WHRB but Schwarz truly works great with WCRB. Here is where Schwarz truly shine as I use a complex defective reception from the edge of a hill and in this case the quality of the Schwarz front and IR filtration become prominent.  

Anyhow, since the Schwarz will be permanently set to get WCRB I am considering converting it to crystal oscillator. No matter how good the Schwarz internal oscillators is but crystal shall be 10 times better and thanks God the smart Germans made the provision to let the receiver to use a selection ether own local oscillator or a quartz oscillator. So, the station is 99.5MHz and the Schwarz runs 21.4MHz IM frequency. So, I need 120.9MHz serial quartz oscillator. Does anybody know a company where can I order custom frequency quartz oscillator and have no minimum order?

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
08-17-2011 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,535
Joined on 05-28-2004

Post #: 34
Post ID: 16833
Reply to: 16832
Found the crystals, my tail is trembling…
fiogf49gjkf0d
Have ordered my custom crystal oscillators from International Crystal Manufacturing Company

http://www.icmfg.com/

It is a bit pricy, $25 per oscillator but not end of the world. The lead time 2 week and I am very excited to see how it will end up. As now the Schwarz gets WCRB very good and the common practice do not trouble troubles until troubles trouble you. Still, my associates are convincing me that crystal oscillator feeding the Schwarz’s mixer shall be much better. I am sure that quartz oscillator is the best generator with lover theoretically possible noise but still I wools like to hear if this theoretical “better” will manifest itself in the final Schwarz’s sonic output. Schwarz permits to use dual oscillators, crystal and own local electronic and to flip between then by the use of a switch in the front panel. The Schwarz also allow to measure the output of the crystal oscillator and to tune the after oscillator filtration (!) to the frequency of the local oscillator.  I hope the WCRB outputs exactly the 99.5MHz, BTW I will need to measure precision of the WCRB caring frequency.

Rgs, Romy the Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
08-27-2011 Post does not mapped to Knowledge Tree
Romy the Cat


Boston, MA
Posts 9,535
Joined on 05-28-2004

Post #: 35
Post ID: 16881
Reply to: 16833
The Schwarz runs from crystal oscillator!
fiogf49gjkf0d
It was a bit tricky to make it works. The Schwarz original crystal is imposable to get and the new one that I got from ICMC had different internal capacitance, so I was forced to shut them with additional inductance to let the oscillators to fire up in the Schwarz circuit.  As the result I have the tuner frequency reference running from pure, super stable, ultra low noise oscillator. The Schwarz has internal capacity to measure the output of crystal oscillator and to fine-tune the tuner’s front end to the same frequency reference. That is very good but the greatest thing is that by flipping a switch on the front panel I can defeat the quartz oscillator with fix frequency and to engage the local electronic oscillator that follows the returnable front end. This is the ultimate thing that might be done in a Superheterodyne tuner.

Now, leaving all technical nuts and bolts aside the main question is: how the Schwarz driven from crystal oscillator sound different compare to the Schwarz driven from the local oscillator? This is $64000 question, isn’t it? Well, the jury is still out about it. The difference is near negligible. I would say that the difference does exist but it is so insultingly small that it in a way defeats all my efforts I spent. I have short fragments that recorded with both oscillators, I can post it and you will be a judge.  This test is one more indication of how superbly Rohde & Schwarz is built that a crystal oscillator can’t overperform the unit local electronic oscillators. Dima explained to me that the quality of the Schwarz’s post oscillator filtration and the all silver retuning capacitors is so high in Schwarz that he is not surprised with my results. Well, the question I ask then is why Rohde & Schwarz is made the provision for crystal oscillator then. The stability is not truly a factor as the stability of Schwarz tuning with local oscillator is phenomenal. In addition then Schwarz is tuned to a station and reaches own cruse temperature it has a provision to mechanically lock all tunable caps and then the frequency control is dead stable. So, it has to be a reason why they did it.

I will keep to fine tune the .23-.27uH cap that I shunt my crystal oscillator and perhaps I will be able to get something out of it. The crystal oscillator shall demonstrate less noise no matter what, why I do not hear it. Well, partially is because the noise level that I am getting is not restricted by my receiver by the noise level of WCRB transmitters. Still, I would like to explore this subject to the very end.

The Cat


"I wish I could score everything for horns." - Richard Wagner. "Our writing equipment takes part in the forming of our thoughts." - Friedrich Nietzsche
Page 2 of 2 (35 items) Select Pages:  « 1 2
   Target    Threads for related reading   Most recent post in related threads   Forum  Replies   Views   Started 
  »  New  Sansui TU-X1 Broadcast monitor...  Replace all audio coupling......  Off Air Audio Forum     46  320194  06-20-2007
  »  New  Where are our good Tuners?..  Ok, it did clear the things up....  Off Air Audio Forum     43  273647  03-31-2008
  »  New  The FM Stereo and Multiplex MPX decoders..  The new life of Rohde & Schwarz decoder....  Off Air Audio Forum     12  106883  05-02-2008
  »  New  Tuners and digital noise from DAW, A/D and D/A..  Beter installation + more ferrete...  Off Air Audio Forum     10  76353  07-20-2008
  »  New  A tube tuner? REL Precedent 646C..  REL Precedent Report...  Off Air Audio Forum     24  180239  07-28-2008
  »  New  Align your FM tuners!..  The Munich technician?...  Off Air Audio Forum     7  62074  03-27-2006
  »  New  Forward in the past with old radios...  Kitchen radio as a source of immense pleasure....  Off Air Audio Forum     18  101948  01-21-2011
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