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Search found 603 matches

by k8jd
Sun Jun 18, 2023 6:43 pm
Forum: Engineering & DX'ing
Topic: Televes Hi-VHF Yagi
Replies: 34
Views: 4493

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: 826

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: 1126

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: 2012

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: 916

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: 6905

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: 7150

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: 3922

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: 2211

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: 3922

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: 3922

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: 874

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.
by k8jd
Fri Apr 21, 2023 5:19 pm
Forum: Engineering & DX'ing
Topic: "Solar Max Might Arrive Early"
Replies: 6
Views: 1290

Re: "Solar Max Might Arrive Early"

If solar max will be poor , the next few cycles...I will have to spend my nights on the lower HF bands and sleep all day ! 160, 80 and 60M are not very different when Sol is lazy. :lol:
by k8jd
Wed Mar 29, 2023 7:46 pm
Forum: Engineering & DX'ing
Topic: Nautel MA3 All Digital AM
Replies: 13
Views: 1837

Re: Nautel MA3 All Digital AM

syntheticexctasy wrote:
Tue Mar 14, 2023 2:53 pm
I'll have to try and DX for this. Would be interesting to hear.

I drive a C-MAX and have no problem with AM reception (HD or otherwise)
SO...What's a C-MAX? is it hybrid ?
by k8jd
Wed Mar 29, 2023 7:44 pm
Forum: Engineering & DX'ing
Topic: Nautel MA3 All Digital AM
Replies: 13
Views: 1837

Re: Nautel MA3 All Digital AM

no mention of WWFD being only digital in it's Radiolocator page . I guess they have no way to do something so unexpected !