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Kenwood TS-850S AM Modifications:
The Kenwood TS-850S is capable of some beautiful Low-level, solid state AM modulation if set up properly. There are a few things to consider when using the 850 for AM...
You could simply plug a microphone into the 850's mic input and set the 455 kHz i.f TX filter at 12k and sound okay. But the 850 is capable of so much more quality than can be achieved with the method just mentioned.
First, I recommend a good quality microphone that is capable of reproducing at least 50 Hz ~ 15 kHz
Secondly, some external audio processing can really help shape the AM audio response.
When the mods are complete, you should have no trouble attaining a flat 10kHz AM audio frequency response!
455 kHz I.F. RECEIVER FILTER MODS:
If you would like the widest receiver bandwidth possible, (RX and TX on AM) there are two methods of doing this:
- Place a jumper wire from pin 2 to pin 2 of the optional 455 kHz 500 Hz filter pins. (Photo 21)
- Install a Murada 20kHz filter on an Inrad/850 filter adapter board and install in the 455 kHz 500 Hz filter position. (Photo 22)
Make sure that you enable the 455 kHz I.F. 500 Hz position by setting the top panel dip switches appropriately.
These 455 kHz filter mods dramatically improve the receiver frequency response on SSB and AM but is most useful on AM.
Additionally, you can transmit through this filter position on AM when using the direct balanced modulator feed.
When using the DSP-100 with SSB, the 455kHz I.F. filter is not active, since the DSP-100 does all 455 kHz I.F. processing.
Make sure to performe the TX bandwidth selection menu as seen in the 850 setup page.
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