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Search found 606 matches

by k8jd
Fri Jun 30, 2023 7:28 pm
Forum: Engineering & DX'ing
Topic: Night time FM E-Skip
Replies: 4
Views: 1177

Re: Night time FM E-Skip

E-layer can happen any time of day, but it's seasonal.
by k8jd
Thu Jun 22, 2023 8:26 pm
Forum: Engineering & DX'ing
Topic: AM directional arrays
Replies: 4
Views: 1269

Re: AM directional arrays

Colonel Flagg wrote:
Thu Jun 08, 2023 1:54 pm
How about posting a link to that discussion.

Sounds interesting.
All I can give you is QRZ.com...
I started reading the pages by Carl Smith and got lost in the math by page 40 !
by k8jd
Sun Jun 18, 2023 6:45 pm
Forum: Engineering & DX'ing
Topic: Televes Hi-VHF Yagi
Replies: 34
Views: 4718

Re: Televes Hi-VHF Yagi

CKLW-TV had a much better signal from the Riverside Dr. tower. Too bad they couldn't have just put a tower or building up there somewhat taller than the Ren Cen. But moving was also part of a Canadian government restriction of Canadian stations appealing to a US audience and advertisers that began ...
by k8jd
Sun Jun 18, 2023 6:43 pm
Forum: Engineering & DX'ing
Topic: Televes Hi-VHF Yagi
Replies: 34
Views: 4718

Re: Televes Hi-VHF Yagi

When I read the antennas under test were "inside an attic"......Well I made up my mind . THAT'S the PROBLEM.
by k8jd
Sun Jun 18, 2023 6:32 pm
Forum: Engineering & DX'ing
Topic: Hammarlund HQ 140
Replies: 2
Views: 864

Re: Hammarlund HQ 140

That was a great, old "Boat Anchor " of a radio. I have had my share of old receivers donated or sold to me cheap as I was growing into the radio hobby. I have had Hallicrafters, heathkit, hammarlund, RME, WW2 surplus of unknown manufacturer, and so on. Sometimes a beat up, rusty, dubious looking ra...
by k8jd
Sun Jun 04, 2023 7:48 pm
Forum: Engineering & DX'ing
Topic: AM directional arrays
Replies: 4
Views: 1269

AM directional arrays

I saw an interesting discussion of phased vertical antennas. On QRZ.Com/ sub Antennas towers etc.
Lot of the engineering hams jumped in with modeling software graphics.
Reminds me of my study of AMBC tower arrays in my youth !
by k8jd
Thu Jun 01, 2023 4:34 pm
Forum: Engineering & DX'ing
Topic: FM DX e-skip 5/31/23
Replies: 15
Views: 2196

Re: FM DX e-skip 5/31/23

I lived in Livonia from 1949 to 1963, In about 1961 I got a three tube Granco FM tuner and connected a twinlead dipole that I tacked to my bedroom wall. Heard and sent reception reports to distant stations all over the map. Got some QSL cards and letters frm ON, W.MI, OH, IN , IL etc. This was long ...
by k8jd
Wed May 24, 2023 11:51 am
Forum: Engineering & DX'ing
Topic: Alternate FM channel use in Canada
Replies: 2
Views: 941

Re: Alternate FM channel use in Canada

I don't think directional ants are used for protecting other stations on FM like they do on AM ??
by k8jd
Fri May 12, 2023 2:59 pm
Forum: Broadcasting - General
Topic: FM Transmitter Range
Replies: 60
Views: 7269

Re: FM Transmitter Range

Who mentioned hiding tha box and antenna in a tree on state land. ? This 1000 W transmitter will need a 20A #12 Romex power wire going to it , assuming about 2 kW of 120 VAC power to generate 1 Kw of RF output.power .
I sure would leave a $1000+ of gear behind ANYWHERE!
by k8jd
Fri May 12, 2023 2:41 pm
Forum: Engineering & DX'ing
Topic: Last Electronics Store
Replies: 37
Views: 7422

Re: Last Electronics Store

Anything like it in MI >? I used to ride my bike to Bauers Industrial in old redford in Detroit ! Bought Xtals to use in my novice station from them..
by k8jd
Wed May 10, 2023 10:51 am
Forum: Engineering & DX'ing
Topic: FM power in different areas
Replies: 35
Views: 4162

Re: FM power in different areas

When I was a kid I had some books about broadcasting engineering, there were several charts showing signal strength for various distances VS antenna height and power, in the FM band. I converted the data to show how the signal strength varied with distance with low height and high power and vicevers...
by k8jd
Wed May 10, 2023 10:37 am
Forum: Engineering & DX'ing
Topic: Seeking Receiver recommendations
Replies: 18
Views: 2272

Re: Seeking Receiver recommendations

I also have a Tecsun 880 and believe the small size can not accommodate a decent AM ferrite stick antenna ! It is sadly lacking in AM and LW sensitivity. For Short Wave listening , it can make up for the poor AM/LW. You can plug in a coax fed antenna or just a wire of 20+ ft and really pull in some ...
by k8jd
Tue Apr 25, 2023 5:25 pm
Forum: Engineering & DX'ing
Topic: FM power in different areas
Replies: 35
Views: 4162

Re: FM power in different areas

I started typing my answer and had to feed a hungry, noisy cat, came back and found some one beat me (the ever watchful Ben Z.) with a similar answer :D
Yes Zone I and II, line C,
by k8jd
Tue Apr 25, 2023 5:23 pm
Forum: Engineering & DX'ing
Topic: FM power in different areas
Replies: 35
Views: 4162

Re: FM power in different areas

Power Answers Most chicago FM transmitting is done from a few buildings a thousand ft tall or more, The FCC has a chart that shows required power Reduction when the antenna is over 500 ft tall for Class B and C stations. This is to Give an equivalent signal level at a certain distance from the tran...
by k8jd
Fri Apr 21, 2023 5:26 pm
Forum: Engineering & DX'ing
Topic: If ATSC 3.0 broadcasts pack 50 radio stations in one TV channel, I’m all ears
Replies: 2
Views: 912

Re: If ATSC 3.0 broadcasts pack 50 radio stations in one TV channel, I’m all ears

FM ;subchannels are bad enough!
So, when driving around Oakland county lake areas, the main FM stereo HD channel just goes mono, but the "subchannels" Just go dead silent if the signal level drops much.
That's VHF and UHF is sure to be worse for loosing signals when moving.