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Search found 65 matches

by Rich
Sat Jun 15, 2019 10:06 am
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 680

Re: WJR vs. WWJ Fields at Utica, MI

Here is a study using NEC4.2 set for an Earth conductivity of 8 mS/m: The WWJ 186° radiator at 8 Mile Rd used alone, and driven with 5 kW would generate about a 20.6 mV/m field in Grosse Pointe, MI (a 14 mile path at N107°E). The 186° radiator used alone and driven with 1 kW would generate a field o...
by Rich
Fri Jun 14, 2019 6:22 pm
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 680

Re: WJR vs. WWJ Fields at Utica, MI

CK-722 wrote:
Fri Jun 14, 2019 3:58 pm
As far as I can see, the pattern can be reconstructed from the data on fccinfo, ...
Below is an easy way out by taking the pattern from the fccinfo page and adding some text labels to it.

Image
by Rich
Fri Jun 14, 2019 6:45 am
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 680

Re: WJR vs. WWJ Fields at Utica, MI

... I think it shows what the FI would be along points of a circle equidistant from the old WWJ tower, about 14 miles away. Correct. I don't know why the first circle is 0 and not the center of the graph. I set the lower limit of the scale to less than zero field to give more resolution to the lowe...
by Rich
Thu Jun 13, 2019 11:54 am
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 680

Re: WJR vs. WWJ Fields at Utica, MI

(Corrected for 5 kW at common point) Below is a NEC4.2 study showing the nighttime groundwave fields at a radius of 14 miles from WWJ using their tx site on 8 Mile Road (if I did it right). The array parameters were taken from the links provided earlier in this thread by CK-722. I didn't bother rot...
by Rich
Wed Jun 12, 2019 2:06 pm
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 680

Re: WJR vs. WWJ Fields at Utica, MI

CK-722 wrote:
Wed Jun 12, 2019 1:36 pm
...Can you find enough data to reconstruct the WWJ site near 8 Mile and Meyers with a 186 degree antenna at the Hall and Van Dyke RL? ...
A quick look at that for the 5 kW, non-D case shows about 20 mV/m at Van Dyke and Hall Rds, Utica (14 mile path at N30°E).
by Rich
Wed Jun 12, 2019 1:24 pm
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 680

Re: WJR vs. WWJ Fields at Utica, MI

V-Soft shows WJR with 18.4 mV/m, and WWJ (daytime) with 10.4 mV/m in ZIP 48315 — partly occupied by part of Utica, MI.

That would be a difference of 5 dB on the Tecsun display, if it was showing the relative difference between those two fields accurately.
by Rich
Tue Jun 11, 2019 5:39 am
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 680

Re: WJR vs. WWJ Fields at Utica, MI

... and even though WWJ radiates greater groundwave fields than WJR does toward the North, the calculated daytime field intensity from WJR is >80% greater than that from WWJ at/near that north-suburban-Detroit location in Utica. The reasons for this: the ~10-mile longer path length, and the higher c...
by Rich
Sun Jun 09, 2019 8:15 am
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 680

WJR vs. WWJ Fields at Utica, MI

Below is a table showing the calculated, daytime fields from WJR and WWJ in Utica, MI. Just wondering if anyone owning one of the ultralight receivers with a "field strength" display in units of dBµ (like the Tecsun PL-880) would check to see how closely it shows the 5.3 dB difference between WJR an...
by Rich
Thu May 30, 2019 2:34 pm
Forum: Engineering & DX'ing
Topic: Bought The Tecsun PL-880; Logged PH 333 kHz; Questions For Rich
Replies: 15
Views: 363

Re: Bought The Tecsun PL-880; Logged PH 333 kHz; Questions For Rich

As for the AM sensitivity of portable/mobile receivers, the two best that I own are a Sangean PR-D15, and the stock radio in my 2016 Toyota Corolla. Both of them provide understandable (but quite noisy) reception of a 530 kHz TIS station about 35 miles away, which has a field intensity of less than ...
by Rich
Thu May 30, 2019 10:26 am
Forum: Engineering & DX'ing
Topic: Bought The Tecsun PL-880; Logged PH 333 kHz; Questions For Rich
Replies: 15
Views: 363

Re: Bought The Tecsun PL-880; Logged PH 333 kHz; Questions For Rich

fairbankshockeypuck wrote:
Thu May 30, 2019 9:43 am
Does the alligator method to the telescoping antenna help both AM and FM or just FM??
FM, maybe, when connecting to an external, elevated FM receive antenna.

It might help SW reception, when connecting to an external wire antenna 20 or 30 feet long.
by Rich
Thu May 30, 2019 8:23 am
Forum: Engineering & DX'ing
Topic: Bought The Tecsun PL-880; Logged PH 333 kHz; Questions For Rich
Replies: 15
Views: 363

Re: Bought The Tecsun PL-880; Logged PH 333 kHz; Questions For Rich

... I see what causes the problems with trying to get a usable readout on the signal strength meter. It looks like it is processed after the AGC, making a large range of FI read nearly the same [/b]. ... My PL-880 displays "signal strength'" variations exceeding 25 dB during some nighttime fades on...
by Rich
Thu May 30, 2019 5:54 am
Forum: Engineering & DX'ing
Topic: AM Radio Signal Patterns
Replies: 11
Views: 388

Re: AM Radio Signal Patterns

... It's very hard to enjoy the site with Googles 'tainting' as they have. Wish the owner would 'switch' to a new map source too like Radio-locator did. ... The latest download of that software from the link below removed the Google map overlay message, as well as making several other changes. Belo...
by Rich
Fri Apr 26, 2019 5:09 am
Forum: Metro Detroit/SE Michigan
Topic: What WJR Could Change In The Future.
Replies: 51
Views: 2758

Re: What WJR Could Change In The Future.

JGP1954 wrote:
Thu Apr 25, 2019 8:31 pm
Bring back the best of Bud Guest and the Sunny Side of the Street Club!
Also re-runs of the programs of Mike Whorf, Ted Strasser, Karl Haas, Jay Roberts, and other WJR personalities.
by Rich
Wed Apr 24, 2019 4:54 am
Forum: Engineering & DX'ing
Topic: Glen Clark, Radio Consulting Engineer, Has Passed Away
Replies: 5
Views: 265

Re: Glen Clark, Radio Consulting Engineer, Has Passed Away

I talked to Glen Clark several weeks ago. We talked a bunch about WLS, but I didn't realize that he had done a bunch of work for WLS (AM) when he was the CE at WLS-FM/WDAI. We emailed back and forth about my ideas to improve their signal. ... Warren Shulz, the retired and recently deceased C.E. of ...
by Rich
Sun Feb 10, 2019 7:13 am
Forum: Engineering & DX'ing
Topic: Can't Get WJBK Off-Air in SW Detroit
Replies: 32
Views: 1849

Re: Can't Get WJBK Off-Air in SW Detroit

RE: ... Who would have believed 50 years ago that the FCC could convince VHF broadcasters that UHF was better? Yes, if you handicap VHF with low ERP and a typically inefficient VHF antenna. ... Just to note that the FCC authorized higher ERPs for analog TV stations using Ch 7-13 (316 kW) and Ch 14 a...