Michael wrote:

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 ???



As a native Minnesotan, one thing that I've always found disappointing
is that WCCO (830 kHz) doesn't seem to get out as well as other clear
channel stations. Last week, I was road tripping, and as we rolled into
Escanaba, MI, I found I was able to get KYW, KDKA, WBZ, WHAS, and others
without trouble, but nothing on 830.

I'm wondering... do others find that WCCO is a more difficult catch than
other clear channels?


(P.S. I should probably mention that back in 1986, I was able to listen
to WCCO's Gopher football broadcast on a walkman in the Liberty Bowl
stadium in Memphis, TN, while watching the Gophers play that game live.
So it would seem that "CCO's signal got out better in the past.)

Tony Calguire wrote:

Michael wrote:

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 ???


As a native Minnesotan, one thing that I've always found disappointing
is that WCCO (830 kHz) doesn't seem to get out as well as other clear
channel stations. Last week, I was road tripping, and as we rolled into
Escanaba, MI, I found I was able to get KYW, KDKA, WBZ, WHAS, and others
without trouble, but nothing on 830.

I'm wondering... do others find that WCCO is a more difficult catch than
other clear channels?

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.


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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.
--
Doug Smith W9WI
Pleasant View (Nashville), TN EM66
http://www.w9wi.com

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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