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May 31, 2009

Comments

Mike W

Interesting. Two questions :

(1) Putting audio quality aside, let's say the PR-D5's AM reception is 10. What would the CR-1100's AM reception be? Seven, nine, ten, what?

(2) That tuning knob, does it spin a full 360 degrees or is one of those maddening ones that only jogs left and right, like that Radio Shack digital AM/FM "long distance" radio?

Jeffrey McMahon

Mike, I believe we're talking 360 degree knob.

I can't really gauge AM until tonight. For now my C.Crane CSW, CR-1100, and PR-D5 all sound great. But tonight when AM compromises, the CR-1100 will be tested.

Gary Kinsman

Mediumwave (AM broadcast band) sensitivity is best tested during the day, because signals are weaker during the day than they are at night. See if you can get 550 KUZZ (5 kW in Bakersfield) on either of the radios during the day. I use this station to check low-band sensitivity from Simi Valley.

Jeffrey McMahon

Gary, where I live AM signals fade at night. I don't know why this is the case. I'll try 550.

Gary Kinsman

You're right about fading at night, Jeff. This is sometimes due to the groundwave and skywave signals combining partially out of phase, or it can happen for distant signals which only have a skywave. Sync detectors can help this so-called selective fading. Even with an 8" ferrite loopstick, my GE SRIII often sounds terrible on KNX at night due to selective fading, and I'm less than 40 miles from the 50 kW transmitter.

Daytime is better for comparing raw sensitivity, due to the lack of fading, and weaker maximum signal levels.

Huesby

"Gary, where I live AM signals fade at night. I don't know why this is the case."...
Excuse me.. In which planet you said you live ?... This is the first time in my life I've heard that AM signals are weaker at night.. I really should go to know this place.., ;-)

Scooby214

Jeff, is your KSPN 710 weaker at night? A look at www.radio-locator.com shows that KSPN's signal is a nondirectional 50kw during the day, and a highly directional 10kw at night. It looks like the signal is not necessarily nulled in your direction, but is still much weaker than during the day.

Jeffrey McMahon

ESPN 710 gets birdy at night and day; 830 AM really gets bad as the sun goes down.

Jeffrey McMahon

For day, the CR-1100 sounds great on AM. I doubt, though, anyone will call it a DXer's dream. Its FM seems most groundbreaking to me.

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