Doug Smith W9WI wrote:

starman wrote:
I have the same problem with receiving WHAM-1180 Rochester, NY in the
daytime. I can get all the NYC and Boston 50-KW stations in the day but
not WHAM, which is about the same distance from me as NYC. I think it
may have something to do with their transmitter location and ground
(soil) conditions. Also the Hudson river valley may enhance daytime MW
propagation to my area from NYC.

WHAM's relatively high dial position doesn't help. A given amount of
power covers better at the bottom of the dial (daytime) than it does at
the top - by an amazing amount.

True but I can get 1130-NYC and 1030-Boston with relatively strong
daytime signals. My antenna is not long enough to be directional for MW.


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starman wrote:
True but I can get 1130-NYC and 1030-Boston with relatively strong
daytime signals. My antenna is not long enough to be directional for MW.

Interesting.

Your antenna probably *is* directional for MW, just not predictably so...
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

Doug Smith W9WI wrote:

starman wrote:
True but I can get 1130-NYC and 1030-Boston with relatively strong
daytime signals. My antenna is not long enough to be directional for MW.

Interesting.

Your antenna probably *is* directional for MW, just not predictably so...
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

Every small antenna has the same pattern, a donut with a single axis of opposite
nulls, for its electrical response and for its magnetic response.

So if it's chiefly electrical or chiefly magnetic, it's a donut.

You get deep nulls mostly by constructing small antennas so they are entirely
magnetic or entirely electrical. Otherwise the out-of-phase electrical and
magnetic responses fill in each other's nulls.

Or you can phase-shift the electrical response and get a unidirectional
combination electrical/magnetic antenna, eg. a loop plus a co-located whip
combined with a phase shift.
--
Ron Hardin


On the internet, nobody knows you're a jerk.

Ron Hardin wrote:

Doug Smith W9WI wrote:

starman wrote:
True but I can get 1130-NYC and 1030-Boston with relatively strong
daytime signals. My antenna is not long enough to be directional for MW.

Interesting.

Your antenna probably *is* directional for MW, just not predictably so...
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

Every small antenna has the same pattern, a donut with a single axis of opposite
nulls, for its electrical response and for its magnetic response.

So if it's chiefly electrical or chiefly magnetic, it's a donut.

You get deep nulls mostly by constructing small antennas so they are entirely
magnetic or entirely electrical. Otherwise the out-of-phase electrical and
magnetic responses fill in each other's nulls.

Or you can phase-shift the electrical response and get a unidirectional
combination electrical/magnetic antenna, eg. a loop plus a co-located whip
combined with a phase shift.

The explanation I favor is the WHAM groundwave signal is weaker than the
other stations I mentioned in this thread because of unfavorable soil
conditions and/or a deteriorated ground radial system at the antenna
site. I think those are the most likely causes of reduced daytime
coverage. It would be interesting to know what their (WHAM) daytime
coverage was a few decades ago, to determine if it has deteriorated over
the years.


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Michael,

Printed in a Table on the middle of this webpage you can find the
'official' "Clear Channel" List by the FCC.

AM Station Classes: Clear, Regional, and Local Channels

GoTo= http://www.fcc.gov/mb/audio/amclasses.html

* Class A Station: A Class A station is an unlimited time station
(that is, it can broadcast 24 hours per day) that operates on a clear
channel. The operating power shall not be less than 10 kilowatts (kW)
or more than 50 kW.


~ RHF
..
..
= = = "Michael"
= = = wrote in message .net...
Hiya....

After a few good threads on MW DX'ing, there has been some great info on
some of the AM broadcast "catches" that others have managed to get. There
was also a few posts regarding what AM radios are good for hearing far away
AM radio stations. As was pointed out in a previous post to a poster that
has asked the question of "what AM radio to buy", most of the AM DX'ing that
is being reported on is unreliable and usually too messy to listen to.

This leaves me with yet another AM broadcast question. I'm interested to
find out what 50KW AM broadcast stations http://www.ac6v.com/clearam.htm#USA
(not in your state, or at least 200 miles away) are in fact reliable and
listenable to you ???

Mine from North NJ are (after sundown):

840 kHz WHAS Louisville, KY

1100 kHz WTAM Cleveland, OH

1110 kHz WBT Charlotte, NC

I can hear many other of the 50KW AM stations from time time time, but those
three above are almost always relable and listenable here in NJ.
Especially, WBT.
--
Respectfully,

Michael

Home Page: http://md_dxing.tripod.com/
Northern NJ
R75 w/DSP, Kiwa agc/sync & audio mods
G5RV & 200ft longwire w/ICE-180
MFJ-1048 preselector
SoundBlstr Live PC card w/five piece Cambridge
speakers & full software mixer/eq.