As a "heads up," the FCC is quite active at finding and issuing citations to unlicensed users of the FM broadcast band that do not meet their Rules. Below is a sanitized example of this ... FEDERAL COMMUNICATIONS COMMISSION ENFORCEMENT BUREAU Northeast Region New York Office 201 Varick Street New Yo...

CKWW is literally a hidden gem. Wish it came in better in Ypsi; might just be my radio, but I can't pick it up worth a damn here. ... Below is a more detailed view of the 1 mV/m daytime groundwave signal of CKWW in/near Detroit. They aren't licensed to radiate much power toward Southwest/West/North...

Not your radio at all. CKWW's signal has always been garbage in Washtenaw County. Their signal also stinks in western Oakland County. Below is a plot of the 1 mV/m and 0.1 mV/m daytime groundwave contours of CKWW and some of its co-channel competitors. https://i.postimg.cc/L5MkHvF8/580-k-Hz-Daytime...

Interesting how in one part of that talk he pushes the need to have an omnidirectional pattern for the receive antenna, then a few minutes later he holds up a pair of crossed, folded dipoles having an omni pattern and points out how it can receive co-channel interference from stations in different d...

For years the FCC has limited the maximum power output capability of an AM broadcast transmitter relative to the station's licensed operating power. For example, a 1 kW AM station could not use a transmitter rated for 5 kW output power, etc. Sounds like the FCC has decided that doing so is no longer...

Below are the daytime groundwave field intensity contours for CKLW, and also for some of its nearby, co-channel neighbors. FCC data is used for the licensed, daytime radiation patterns and ERPs of all of these stations. https://i.postimg.cc/h4YkMY1H/CKLW-Daytime-GW-Contours-Nearby-Co-channel-Stns.png

... I've noticed also that some stations who use diplexed antennas have an unusual spacing that suggests that another station planned to or did use the same antenna. WDVD shows 0.93 wavelength, ... The slightly less than 1 wavelength spacing does produce a slight antenna gain over 1 wavelength, but...

Wouldn't that array deliver 400kw at NYC? (when you double the field strength, you fourfold the the ERP, no?). Probably you mean radiates rather than "deliver." Your original question concerned a 100 kW transmitter on 153 kHz using a 2-tower directional array (which has a typical peak gain of ~2X i...

For a quick look — the great circle path length between Bermuda and NYC is about 775 miles, and the ground wave from a transmit system on 153 kHz radiating 200 kW along a sea-water path would be about 1.5 mV/m at the far end. That can be a useful signal at receive locations with low enough r-f noise...

WLW must be at an odd distance to Toledo where it's groundwave runs out at the river and skywave doesn't kick in until you're another 25 miles out? Below is a panel showing the groundwave and skywave fields of WLW in/near Toledo. Their groundwave and 50% nighttime skywave signals are fairly equal i...

Ben Zonia wrote: ↑

Wed Mar 17, 2021 11:49 pm

Strangely enough, since GVSU took over WGVS 850 in Muskegon, the signal has been better than I can ever remember. ...

Below is the nighttime groundwave field of WGVS at 1 km radius, using FCC data:

Below is a coverage map showing the 5, 2, 0.5 and 0.1 mV/m daytime groundwave contours of WJR using a 500 kW transmitter and the directional antenna pattern posted earlier in this thread. It includes the "modernized" effects of varying Earth conductivity in the irregular shapes of those contours. ht...

The Oakville, Ontario news article linked in the OP reports " ...Miller told trustees that the consultants found mitigation would be “immensely expensive” and not certain to be successful. He added that the school’s three storey design was particularly problematic. “The higher up you go, the greater...

Below is a comparison of the nighttime fields of WJR using their existing transmit facilities vs. if the FCC allowed them to use 500 kW with a directional antenna, as WJR proposed in the 1950s. The 1 mV/m contours in this comparison are a fairly strong field. Even when using 50 kW non-D, WJR usefull...

... Are you able to do a similar comparison for Grand Rapids? ... I remember Art Vuolo and others remarking how good the signal (once) was in Columbus, OH ... In the heart of Columbus, reception was no better or barely better than in Grand Rapids. Today, reception of WJR in the Grand Rapids area is...