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Search found 45 matches

by Rich
Wed Jun 12, 2019 1:24 pm
Forum: Engineering & DX'ing
Topic: WJR vs. WWJ Fields at Utica, MI
Replies: 22
Views: 1652

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: 1652

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: 1652

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: 1102

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: 1102

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: 1102

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: 1036

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: 4578

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: 628

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: 4002

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...
by Rich
Mon Dec 31, 2018 10:35 am
Forum: Engineering & DX'ing
Topic: FM translator signal range in Metro Detroit
Replies: 15
Views: 1948

Re: FM translator signal range in Metro Detroit

.. Perhaps Rich could use his Fresnel Zone software to compute this. ... Below is a Longley-Rice graphic showing the fields present at an elevation of 2 meters AGL from a transmit antenna at 260 meters AGL radiating 99 watts ERP in/near the horizontal plane. Omnidirectional transmit and receive ant...
by Rich
Mon Dec 31, 2018 6:40 am
Forum: Engineering & DX'ing
Topic: FM translator signal range in Metro Detroit
Replies: 15
Views: 1948

Re: FM translator signal range in Metro Detroit

Some of the 1960s transistor projects for wireless FM BC mikes put out WAY over the Part 15 limit. 100 mW on FM is WAY OVER the limit. ... How true. 47 CFR §15.239 covers the Iegal , unlicensed use of the FM broadcast band in the U.S. The maximum field intensity at a linear distance of 3 meters in ...
by Rich
Sat Nov 10, 2018 4:51 pm
Forum: Engineering & DX'ing
Topic: AM Band Scan.
Replies: 9
Views: 1803

Re: AM Band Scan.

...The only way that I can see that this could be is if both WJR was operating on Auxiliary facilities. ... The reduction in the field of WJR in Commerce, MI with 50 kW applied to a 1/4-wave monopole auxiliary antenna at their tx site is about 87% of what they produce with their 0.54-wavelength mai...
by Rich
Sat Nov 10, 2018 7:00 am
Forum: Engineering & DX'ing
Topic: AM Band Scan.
Replies: 9
Views: 1803

Re: AM Band Scan.

Sorry, WJR and WFDF did not make it on the Strongest Signal list because WJR was only S9 and WFDF was S9+5dB. I listed only stations with signal strength at S9+10 dB and up. (In case we forget, S9=50 Microvolts at the antenna terminals). ... According to the V-Soft webpage linked above by Arthur Mo...
by Rich
Tue Oct 30, 2018 6:14 am
Forum: Engineering & DX'ing
Topic: Travel Back In Time To Buy A Good TV Antenna
Replies: 69
Views: 26620

Re: Travel Back In Time To Buy A Good TV Antenna

A day or so ago, Arthur Mometer posted that a high power broadcast station might be able to be received on the Moon. Here is a short response I had put together and tried to post but couldn't, as the site was having some issues at that time: A UHF signal of one million watts ERP at the peak of its m...