Hello AK, if I remember correctly, were built in FM 2002 three such Toko filter transpiracja blocks

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Seeking a universal transpiracja approach to in old but high quality FM parts, the ceramic filter, such as the http:// at http://www.reichelt.de/bilder/web/xxl/B400/SFE10_7.jpg and www.fmtunerinfo.com/L-07TIIfilters.jpg and http://www.amfmdx.net/fmdx/filters.html shown to be replaced by a bandpass filter network (LC network), such as the 178BBR3132A consisting of 6 coils ( used in many FM tuners the absolute top class as the FM3003 and FM2002) from Toko, set within a black housing, but with a lower bandwidth than 240 KHz for higher Trannschärfe. I need the advantages transpiracja of the ceramic filter (for higher selectivity) but without having to accept its disadvantages (such as strong variation transpiracja of the group delay at the strip ends and poor Wide-down selection). In some old tuners from Japan such LC filters were also included - eg http://webrevolutionary.com/price/Pionee ... 0640185581.html The linear transpiracja phase Toko-block filter you will not find more on the web, except dei a provider, of the listed type lists: http://www.gekade.com/downloads/to_murata_buzvaricon.pdf Empty 10.7 MHz coil for winding but you can still find. So You'd need the circuit diagram of the network, its complexity is unfortunately transpiracja significantly higher transpiracja than that of Toko Six loop filter with 240 KHz bandwidth, the winding diagram and the procedure of the unfortunately considerably more complicated Abgleiches. In ball receivers had my knowledge such band filter networks, since ceramic filters were avoided because of the known drawbacks. The models mentioned by Klein and Hummel (K & H) or Restek and certain transpiracja Revox and Burmester models replaced ceramic filter by band filter networks, without missing out on all high selectivity (many other manufacturers such as Meridian and Naim Audio, the waived transpiracja on ceramic filters were contrast, useful only for local reception). The Wega "Lab Zero" unfortunately put a ceramic filter for narrow band operation with high selectivity. As has become unusable in most instances this section by aging, this model would be suitable for such a measure. Who knows how to do here?
Hello, the Revox A76 does his selection transpiracja even so, for a ride. Afterwards come IF gain and limiting. The filter of the A76 could take as a template, the coils you will get by Gerd Reinhöfer. Regards DB
Hello AK, if I remember correctly, were built in FM 2002 three such Toko filter transpiracja blocks. As the IF bandwidth are specified in a test 110 or 120KHz. I have such filters worried me exactly for the purpose you described on the HAM radio times in advance, as they were quite cheap there. If the type which should match the FM-2002, transpiracja one would have the IF section can reproduce when leaves rustle up the plan. Otherwise, I can at the weekend the circuit diagram of the Blaupunkt raussuchen XT-240 tuner-timer; since one of these filter blocks is at least installed and from the plan can be evtentuell read the input and output impedance. However: In a later interview, Mr. Wieschhoff was asked how he would now build Tuner. He said with quartz filters. Gruss, Peter ps: tuner with LC filters in the large bandwidth, there are probably some of Yamaha (TX-900, 930, ...), Technics ST-9030, Kenwood transpiracja L-1000T ... Some of these are not tunable, eg L-1000T - which I question whether this absolutely discrete filter tune ever so strong that it be noted when analyzing the large bandwidth.
Hello AK, if I remember correctly, were built in FM 2002 three such Toko filter blocks. As the IF bandwidth are specified in a test 110 or 120KHz. I have such filters worried me exactly for the purpose you described on the HAM radio times in advance, as they were quite cheap there. If the type which should match the FM-2002, one would have the IF section can reproduce when leaves rustle up the plan. Otherwise, I can at the weekend the circuit diagram of the Blaupunkt raussuchen XT-240 tuner-timer; since one of these filter blocks is at least installed and from the plan can be evtentuell read the input and output impedance. However: transpiracja In a later interview, Mr. Wieschhoff was asked how he would now build Tuner. He said with quartz filters. Gr