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Search found 51 matches

by Rich
Sun Feb 10, 2019 7:13 am
Forum: Engineering & DX'ing
Topic: Can't Get WJBK Off-Air in SW Detroit
Replies: 29
Views: 1123

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: 928

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: 928

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: 1084

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: 1084

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: 22562

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...
by Rich
Mon Nov 28, 2016 7:56 pm
Forum: Engineering & DX'ing
Topic: Are Real Radios Becoming Extinct?
Replies: 24
Views: 2516

Re: Are Real Radios Becoming Extinct?

... Internet streaming is no more like real radio, than intravenous feeding is like fine dining. _________ Just to note that by suitable means I can listen to many MF/HF/VHF aural broadcast stations either directly "over the air," or via an Internet stream. From my experience, and depending on the ...
by Rich
Fri Nov 04, 2016 7:12 pm
Forum: Metro Detroit/SE Michigan
Topic: WJR - The First 50 Years
Replies: 2
Views: 986

WJR - The First 50 Years

The following link might be interesting to some ...

http://www.americanradiohistory.com/Arc ... -Years.pdf
by Rich
Sat Aug 13, 2016 6:47 pm
Forum: Broadcasting - General
Topic: 1700 AM Ypsilanti?
Replies: 10
Views: 2188

Re: 1700 AM Ypsilanti?

Part 15 AM's can 0.1 of a watt with 10 foot antenna. Maybe hear it a mile or two. That 0.1 watt is the legal, unmodulated, d-c input power permitted for the final r-f stage of an unlicensed transmitter operating in compliance with FCC §15.219 (a) . But FCC §15.219 (b) also restricts the radiating l...
by Rich
Mon Jul 11, 2016 6:38 pm
Forum: Metro Detroit/SE Michigan
Topic: WJR-AM Transmitter Site
Replies: 6
Views: 1434

Re: WJR-AM Transmitter Site

In the mid 1960s WJR used a CE 317 as their main tx, with their earlier WE 407 as a seldom-used standby.

Later they installed/used/use a Harris DX-50 tx as their main.

R. Fry, WJR staff engr in those days
by Rich
Sun Jul 10, 2016 7:18 pm
Forum: Metro Detroit/SE Michigan
Topic: The Ticket
Replies: 10
Views: 2378

Re: The Ticket

kjblaze wrote:... is it too much to ask to be able to find a safe haven from the 24 hour news cycle regurgitating the same horrible stories?
A safe haven is possible by choosing NOT to watch/listen to those horrible news cycles more often than one can tolerate doing so.
by Rich
Thu Jul 07, 2016 2:54 pm
Forum: Metro Detroit/SE Michigan
Topic: degrees of annoyance
Replies: 18
Views: 3875

Re: degrees of annoyance

Also "aks" instead of "ask." And "bring" when "take" is needed, as in "Bring your passport with you when you travel to a foreign country." The rule: bring something to where you are now, but take it to places you're not. and real-a-tor instead of realtor and jewel-er-y instead of jewelry. etc, etc
by Rich
Fri Apr 29, 2016 6:32 pm
Forum: Engineering & DX'ing
Topic: Pirate Radio Challenge
Replies: 8
Views: 1831

Re: Pirate Radio Challenge

... Why don't these folks try LPAM with the Rangemaster? Just to note that: 1) Unlicensed systems using the AM broadcast band in the U.S. are not necessarily "pirates." Such systems will be operating legally if they comply with FCC §15.219. 2) Even though a certain transmitter designed for the AM b...
by Rich
Thu Apr 14, 2016 5:44 pm
Forum: Metro Detroit/SE Michigan
Topic: Latest Book Surprised Me
Replies: 35
Views: 6352

Re: Latest Book Surprised Me

... In Atlanta, 750 WSB has been simulcast on FM 95.5 for a number of years. ... Possibly that is done because the relatively poor earth conductivity in/near Atlanta reduces the groundwave fields of WSB there, compared to good earth conductivity. OTOH, WSB has a nighttime skywave into west central ...
by Rich
Fri Mar 11, 2016 7:39 am
Forum: Engineering & DX'ing
Topic: Old WJR Transmitter Location
Replies: 29
Views: 2870

Re: Old WJR Transmitter Location

It's about 41 miles. I calculated 4.355 mV/m for 580 kHz with 5000 watts. My NEC model of that tee at Sylvan Lake with 5kW on 580 kHz calculates a groundwave field of about 4.4 mV/m at 41 miles for an 8 mS/m path. What is the actual efficiency of the Sylvan Lake antenna? Did you have or find more d...