From: Garey Barrell 
Subject: Re: [drakelist] Drake on AM


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

ARDUJENSKI{at}aol.com 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



----------------------------------------------------------------------
Submissions:        drakelist{at}www.zerobeat.net
Subscribe:          majordomo{at}www.zerobeat.net - subscribe drakelist in body
Unsubscribe:        majordomo{at}www.zerobeat.net - unsubscribe drakelist in body
Hopelessly Lost:    majordomo{at}www.zerobeat.net - help in body of message
Brought to you courtesy of TLCHost.net  http://www.tlchost.net/
----------------------------------------------------------------------

---