Engineering & DX'ing

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Last post

DIY antenna designs for attic?

Last post by jimh « Fri Dec 11, 2020 4:06 pm
Replies: 52
by km1125 » Fri Jan 03, 2020 7:18 pm
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Wondering if there are any updated designs for DIY UHF antenna that focus on the 470-600MHz frequencies that might be optimized over the old 470-890...
52 Replies

15199 Views

Last post by jimh
Fri Dec 11, 2020 4:06 pm
Ham Radio Question

Last post by Turkeytop « Sat Nov 28, 2020 11:42 am
Replies: 5
by Turkeytop » Fri Nov 27, 2020 9:12 pm

I'm listening right now to the local repeater on the 70 cm band. There are operators on from Australia. How can they work a repeater in Canada from...

5 Replies

2322 Views

Last post by Turkeytop
Sat Nov 28, 2020 11:42 am
Earth Conductivity vs. Groundwave Field Intensity

Last post by Turkeytop « Thu Nov 26, 2020 1:31 pm
Replies: 10
by Rich F. » Wed Nov 25, 2020 5:18 am

The graphic below is pretty much self-explanatory, and shows maybe some surprising results for the relative coverage areas of those two almost...

10 Replies

2637 Views

Last post by Turkeytop
Thu Nov 26, 2020 1:31 pm
Universal Radio closing November 30

Last post by Turkeytop « Sun Nov 22, 2020 8:14 pm
Replies: 4
by SolarMax » Sun Nov 22, 2020 1:54 pm

Long-time SWL and ham gear retailer Universal Radio, outside of Columbus, OH has announced it is closing on November 30, as the owners are retiring....

4 Replies

1633 Views

Last post by Turkeytop
Sun Nov 22, 2020 8:14 pm
Built some Hovermans

Last post by km1125 « Wed Nov 18, 2020 3:41 pm
Replies: 14
by km1125 » Mon Oct 26, 2020 1:59 pm

I've been meaning to build a couple DIY antennas to use in the attic. I was going to use an antenna design that seems to be pretty popular that's...

14 Replies

3715 Views

Last post by km1125
Wed Nov 18, 2020 3:41 pm
The Most Complete Single Conductivity Study Of Northwest And Northern Lower Michigan

Last post by CK-722 « Tue Nov 17, 2020 12:38 pm
Replies: 9
by CK-722 » Fri Nov 13, 2020 11:51 am

Every 5 degrees from the WTCM site, done by Khanna and Guill going back to 1981 when WTCM moved to 580 and 1984 when they increased from 2.5 to 5 kW,...

9 Replies

3224 Views

Last post by CK-722
Tue Nov 17, 2020 12:38 pm
Mini DXpedition 2020

Last post by Turkeytop « Fri Nov 13, 2020 7:28 pm
Replies: 13
by Turkeytop » Sun Oct 18, 2020 9:34 pm

Every fall I pick a day and head out into the country for a few hours to do some DXing on the short wave bands. I take along a radio or two and some...

13 Replies

3000 Views

Last post by Turkeytop
Fri Nov 13, 2020 7:28 pm
What About This Antenna Is Superior Enough To Justify Cost?

Last post by k8jd « Sat Nov 07, 2020 11:47 pm
Replies: 11
by CK-722 » Tue Nov 03, 2020 11:50 am

I don't see any specs that are that impressive-like 8.2 dB over isotropic, not even over a tuned dipole.

11 Replies

2734 Views

Last post by k8jd
Sat Nov 07, 2020 11:47 pm
The FCC Will Vote This Month on All-Digital AM

Last post by SixPlusOne « Tue Nov 03, 2020 12:56 pm
Replies: 23
by SixPlusOne » Sat Oct 10, 2020 7:08 pm
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The FCC Will Vote This Month on All-Digital AM

The Federal Communications Commission will vote this month on whether to allow AM stations in the...
23 Replies

5914 Views

Last post by SixPlusOne
Tue Nov 03, 2020 12:56 pm
DX in reverse?

Last post by Turkeytop « Thu Oct 29, 2020 9:44 pm
Replies: 16
by ADD in TC » Tue Aug 04, 2020 11:27 am
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Sunday,at around 1:15,while listening to 98.9 WEMP over the Tune in app,the music I was hearing suddenly was replaced by a statical signal from the...
16 Replies

4647 Views

Last post by Turkeytop
Thu Oct 29, 2020 9:44 pm
Distant stations on local AMs

Last post by Turkeytop « Thu Oct 29, 2020 7:28 pm
Replies: 7
by fuzzpower » Wed Oct 21, 2020 5:08 am

I’m not talking about puny Class D stations allowed to stay on at night with 17 watts, this is for actual locals who are getting interference from...

7 Replies

2514 Views

Last post by Turkeytop
Thu Oct 29, 2020 7:28 pm
The End of an Era

Last post by Turkeytop « Thu Oct 29, 2020 3:16 pm
Replies: 3
by Turkeytop » Sat Oct 24, 2020 10:14 pm

The Universal Radio catalog has no desktop short wave radios now. Only SDRs.

Anyone wanting a regular radio has to look in the potables section.

Of...

3 Replies

1434 Views

Last post by Turkeytop
Thu Oct 29, 2020 3:16 pm
Early Development Of AM BC DAs

Last post by k8jd « Tue Oct 27, 2020 4:13 pm
Replies: 6
by CK-722 » Sat Oct 24, 2020 11:25 pm

39 DAs were operating before the start of World War II. In Michigan, there were 3 to 5 operating, WWJ, WXYZ, WFDF, and possibly WKZO and WOOD, by...

6 Replies

2303 Views

Last post by k8jd
Tue Oct 27, 2020 4:13 pm
Solar Cycle 25 Is Upon Us

Last post by Turkeytop « Sat Oct 24, 2020 10:07 pm
Replies: 7
by Turkeytop » Sat Oct 03, 2020 10:59 pm

So long, cycle 24. Don't let the door hit you in the ass on the way out.

But, they're predicting #25 will be even weaker than 24.

7 Replies

2154 Views

Last post by Turkeytop
Sat Oct 24, 2020 10:07 pm
AM Daytime And CH NW Straits Area Of Michigan

Last post by CK-722 « Sat Oct 24, 2020 3:50 pm
Replies: 35
by TC Shuts Up » Fri Sep 18, 2020 9:36 pm
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Alone Groudwave

580 WTCM
620 WTMJ
680 WDBC
790 WSGW
940 WIDG
1110 WJML
1240 WCBY
1270 WMKT
1310 WCCW
1340 WMBN

Alone Borderline

760 WJR
960 WHAK...
35 Replies

8667 Views

Last post by CK-722
Sat Oct 24, 2020 3:50 pm
Vintage Sony Portable

Last post by Turkeytop « Fri Oct 16, 2020 9:11 am
Replies: 2
by Turkeytop » Wed Oct 14, 2020 9:54 pm

Found this image in a google search

I had this very radio back in the early 60s. Five transistor, pocket size, AM only. Loved it.

It was about a...

2 Replies

1710 Views

Last post by Turkeytop
Fri Oct 16, 2020 9:11 am
Nice Map If This Link Works

Last post by CK-722 « Tue Oct 13, 2020 1:34 pm
Replies: 18
by Ben Zonia » Sat Oct 10, 2020 1:41 am
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18 Replies

4708 Views

Last post by CK-722
Tue Oct 13, 2020 1:34 pm
Sleeping Bear Dunes Bandscans (600+ mi.)

Last post by cckadlec « Mon Oct 12, 2020 11:15 am
Replies: 9
by cckadlec » Wed Oct 07, 2020 11:45 am

The catches of August 27th from my Empire Bluff site south of Empire, Mich., 445 feet above Lake Michigan, included some big signals up to 600+ miles...

9 Replies

3531 Views

Last post by cckadlec
Mon Oct 12, 2020 11:15 am
Environment Canada to end weather radio.

Last post by k8jd « Sat Oct 03, 2020 12:13 pm
Replies: 22
by Turkeytop » Mon Sep 14, 2020 5:12 pm
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Environment Canada operates a system of weather radio stations, similar to NOAA. They have announced they will end this service within six months....
22 Replies

5646 Views

Last post by k8jd
Sat Oct 03, 2020 12:13 pm
09/26-27 Tropo

Last post by djb « Thu Oct 01, 2020 5:55 am
Replies: 4
by ChrisWL1980 » Sun Sep 27, 2020 3:35 pm

Heard in Whitmore Lake:

Star 88.3 (unable to tell whether this was WEAX Angola or WLAB Ft. Wayne)
88.7 WICR Indy
90.1 WFYI Indy mixing with WUCX...

4 Replies

1947 Views

Last post by djb
Thu Oct 01, 2020 5:55 am
Virtual endec

Last post by k8jd « Wed Sep 23, 2020 12:22 pm
Replies: 7
by bobhuge » Mon Sep 21, 2020 11:04 am

Hello someone smarter than me, I need to move my automation to my tower and with that I'll need to install some form of EAS with it.

Does anyone...

7 Replies

2139 Views

Last post by k8jd
Wed Sep 23, 2020 12:22 pm
Fires Threaten Mt. Wilson Radio TV Microwave Towers And Observatory

Last post by Ben Zonia « Wed Sep 16, 2020 3:35 pm
Replies: 2
by Ben Zonia » Tue Sep 15, 2020 10:49 pm

Strange that KNX is mentioned but their tower is not there.

Wonder how many have auxiliaries. Anyone know where? Hollywood Hills?

2 Replies

1209 Views

Last post by Ben Zonia
Wed Sep 16, 2020 3:35 pm
The Big Opening To The East

Last post by ftballfan « Tue Sep 15, 2020 9:01 am
Replies: 5
by cckadlec » Sun Sep 13, 2020 2:49 pm

Here's a summary of tropo happenings in Fremont from the afternoon of Sept. 11th into the morning of the following day.

A duct broke open into...

5 Replies

2052 Views

Last post by ftballfan
Tue Sep 15, 2020 9:01 am
Beer Goes Nerdy

Last post by audiophile « Tue Sep 15, 2020 6:30 am

by audiophile » Tue Sep 15, 2020 6:30 am

Heathkit and MFJ could have made a mint - both had cantennas aka dummy loads..

0 Replies

762 Views

Last post by audiophile
Tue Sep 15, 2020 6:30 am
DX late morning (9/3/20)

Last post by CK-722 « Fri Sep 04, 2020 1:13 pm
Replies: 4
by MWmetalhead » Thu Sep 03, 2020 10:04 pm

Was picking up 98.5 WUPS at full quieting with RDS around Fowlerville and Webberville around 10:45a this morning.

Was also picking up a pretty good...

4 Replies

1554 Views

Last post by CK-722
Fri Sep 04, 2020 1:13 pm

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