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Search found 346 matches

by k8jd
Tue Dec 01, 2020 4:59 pm
Forum: Engineering & DX'ing
Topic: Scanners
Replies: 71
Views: 4635

Re: Scanners

144-148 is the 2M amateur band. I have had a few scanners that have AWFUL image rejection and you hear signals that are 10 to 22 MHz off where you are tuned , depending on the unit's I.F freq.
by k8jd
Sat Nov 28, 2020 10:45 am
Forum: Engineering & DX'ing
Topic: Ham Radio Question
Replies: 5
Views: 184

Re: Ham Radio Question

used to keep track of the local ops I know by listening to a scanner on the 2M and 70 CM FM repeaters while I operated on the HF bands, now there are almost no conventional FM modes left and all I can hear on the Scanner is arircraft band traffic.
by k8jd
Sat Nov 28, 2020 10:42 am
Forum: Engineering & DX'ing
Topic: Ham Radio Question
Replies: 5
Views: 184

Re: Ham Radio Question

I still think that's cheating . Like using your cell phone to call a ham operator in a distant country and expecting him to send you a QSL Card toward a DX Radio award. Worked the world from a repeater a few miles away on V or UHF , IS NOT REAL ham radio ! It may be fun but/// It's becoming a comput...
by k8jd
Thu Nov 26, 2020 1:07 pm
Forum: Engineering & DX'ing
Topic: Earth Conductivity vs. Groundwave Field Intensity
Replies: 10
Views: 198

Re: Earth Conductivity vs. Groundwave Field Intensity

At night , if I angle my Tecsun portble radio right, I can hear WSB perfectly, without any splatter from WJR. I 'm located 33 miles north by northwest of WJR. That helps.
by k8jd
Thu Nov 19, 2020 3:47 pm
Forum: Engineering & DX'ing
Topic: DIY antenna designs for attic?
Replies: 45
Views: 2674

Re: DIY antenna designs for attic?

I've been looking over some information on that Texscan Jerrold. I see claims that it covers 4-450 to 4-1000 MHz. Perhaps different models, later covering the really high Cable Channels/OTA Channels. So I guess it's not much help with AM BC. A halfwave dipole for 1000 kHz is 468 ft long. A Quarterw...
by k8jd
Thu Nov 19, 2020 3:39 pm
Forum: Engineering & DX'ing
Topic: DIY antenna designs for attic?
Replies: 45
Views: 2674

Re: DIY antenna designs for attic?

FUN Project I found a simple design page feturing UHF antennas, one is the single bow tie, This has a wider bandwidth than a folded dipole and may be easier to make. I did not make notes of the freq range , but I am sure it will cover the UHF TV channels. It's 16 1/2 inches end to end and the eleme...
by k8jd
Wed Nov 11, 2020 8:44 pm
Forum: Engineering & DX'ing
Topic: Mini DXpedition 2020
Replies: 13
Views: 484

Re: Mini DXpedition 2020

R. Havana has had some audio problems for some time now.
by k8jd
Wed Nov 11, 2020 11:53 am
Forum: Engineering & DX'ing
Topic: Mini DXpedition 2020
Replies: 13
Views: 484

Re: Mini DXpedition 2020

Well, it was Monday. The perfect weather compensated for the not so perfect reception. There aren't a lot of SW Broadcasters around any more, so some of my loggings were just Utility Stations Anyway it was a good day. 6030 KHZ – Radio Marti US anti Cuban Radio 6180 KHZ – China Radio International C...
by k8jd
Wed Nov 11, 2020 11:50 am
Forum: Engineering & DX'ing
Topic: Mini DXpedition 2020
Replies: 13
Views: 484

Re: Mini DXpedition 2020

You picked the right freq range for low sunspot DX ! Now summer is over the lightning noise is much less troublesone and clear listening is easy. I suggest buiding a large multiturn portable loop and tuning it for the long waves. I have been following the long wave Airport beacons . If you can copy ...
by k8jd
Mon Nov 09, 2020 12:41 pm
Forum: Engineering & DX'ing
Topic: Downriver AM transmitters
Replies: 33
Views: 1647

Re: Downriver AM transmitters

Never actually measured it but now I had to ! WXYT transmitter to my house, distance 38.75 Miles, azimuth angle is 350.5 degrees. Pretty close to the night time null in the pattern. The distance may also be a factor for whatever angle the sky wave is going out. 40 years ago I lived 4 miles south of ...
by k8jd
Sun Nov 08, 2020 9:43 pm
Forum: Engineering & DX'ing
Topic: Downriver AM transmitters
Replies: 33
Views: 1647

Re: Downriver AM transmitters

The old Night WXYT pattern on 10 Mile Rd. used 165 degree towers, and went as well to the South as to the North. The Nondirectional Day pattern was the equivalent of 8250 watts referenced the the legacy Class B efficiency minimum of 282 mV/m @ 1 kW @ 1 km. [img]https://www.fccinfo.com/image.php?S T...
by k8jd
Sat Nov 07, 2020 11:52 pm
Forum: Engineering & DX'ing
Topic: Downriver AM transmitters
Replies: 33
Views: 1647

Re: Downriver AM transmitters

I know one area station that is NOT aimed North , located near Mt Clements on 1030 with daylight operation only ! Aimed south west to protect WBZ !

WUFL !
by k8jd
Sat Nov 07, 2020 11:47 pm
Forum: Engineering & DX'ing
Topic: What About This Antenna Is Superior Enough To Justify Cost?
Replies: 11
Views: 498

Re: What About This Antenna Is Superior Enough To Justify Cost?

I remember seeing the LP at Farmington hills and also In Warren, there were a few other HF LP antennas I have seen in my travels around MI before I retired ! CK722 has a good understanding on how they work, it's A lot different idea than a Yagi Design ! Aside; My first transistor audio amp homebrewe...
by k8jd
Tue Nov 03, 2020 4:31 pm
Forum: Engineering & DX'ing
Topic: What About This Antenna Is Superior Enough To Justify Cost?
Replies: 11
Views: 498

Re: What About This Antenna Is Superior Enough To Justify Cast?

Maybe use at a cable TV company head end, far from the city. Or on a hi-rise luxury condo building roof, for a building wide CATV system ! It must have solid elements (not aluminum tubing), maybe silver plated connectors, and stainless steel hardware holding it together. Must be Built to go on a tal...
by k8jd
Sun Nov 01, 2020 11:58 am
Forum: Engineering & DX'ing
Topic: WWV / WWVH
Replies: 13
Views: 1145

Re: WWV / WWVH

The WWV Song (5-10-15-20-25-30...). Actually, they did operate on 30 MHz (and 35 MHz ) until 1953. When they do their "TOH" ID, I always expect them to break into this song. https://www.youtube.com/watch?v=LEh4clWpFNQ&feature=emb_logo I know they dropped the 25MHz transmitter for a while, but now i...