DK6QI:<br>
<br>
My FT-840 has the optional 455kHz FM IF board installed. I am using FM mode to receive DRM. It is not the optimum as the agc is reduced in function and you have to keep a certain IF signal level manually with an antenna attenuator. <br>
<br>
I used the Sat-Schneider converter board with 467 kHz crystal:<br>
http://www.sat-schneider.de/DRM/DRM.htm<br>
You have to use the option "Flip Input Spectrum" in DREAM. <br>
<br>
This converter board is mechanically fixed on the backside of the FM board with three wires:<br>
+9Volt supply to pin3 of board connector (FM 9V)<br>
GND to the grounded end of the 8.6708 MHz quartz<br>
Input to the pin of the 455kHz ceramic filter that is connected to pin 5 of the MC3357<br>
<br>
The original ceramic filter is too wide for good results. I found optimum performace with a filter that is specified a little too narrow, but results were best with a muRata CFW455HT. <br>
CFW455F, G or H should also work.<br>
<br>
I connected the 12 kHz output to an additional cinch connector at the FT840 backside via a short piece of RG174, see attached fotos.<br>
<br>
<br>
<img src="FT840DRM_DK6QI.JPG">