Alan -
The 2B is a little narrow. Best to use "Exalted Carrier" AM reception. Essentially this means turning on the BFO and tuning in the AM signal like an SSB signal. With the 3.6 kHz b/w selectivity you have one sideband. This actually helps with things like selective fading, etc. But it ain't "AM" !
The R-4/A/B receivers are only a little better, since they have a 4.8 kHz selectivity. This is _almost_ enough for AM, which is generally assumed to be about 6-7 kHz wide. So again, you really are limited to Exalted Carrier AM, as AM that is center tuned will be a little muffled.
The R-4C has an AM position and Drake offered a 4 kHz b/w and 6 kHz b/w filter. The receiver came from the factory with a resistor in the socket for the (optional) AM filter. The "roofing" filter for the R-4C is 8 kHz wide so is pretty "high fidelity" for AM, and this is what you get with the resistor in there.
But for REAL AM , you need a real AM receiver. Collins 51J-3/4, National NC-300/303, Hammarlund HQ-129X, HQ-140X, Hallicrafters SX-100, etc. But none of these qualify for "small footprint"!
73, Garey - K4OAH Atlanta
[EMAIL PROTECTED] wrote:
> A friend of mine is regressing (or progressing) back into AM and wants a small footprint high quality AM receiver. He tried the Drake 2B and claims it is a bit too narrow bandwidth wise for good AM fidelity. Are there any of say the R-series that may have a bit better audio on AM? I had passed along information that with AM a weak and fading signal will have an affect on the audio so a GOOD antenna is necessary too. Thanks
>
> Alan KB7MBI
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