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Search found 174 matches

by k8jd
Wed Jan 15, 2020 3:00 pm
Forum: Engineering & DX'ing
Topic: Passive Repeaters On Hilltops
Replies: 8
Views: 302

Re: Passive Repeaters On Hilltops

Say you put a high gain YagiLog to receive a signal,] Actually a LPDA (Log Periodic Directional Antenna) is limited to about 6 dB directional gain over it's frequency spread. That's due to it's deign to be usable over an octive or more of frequency with a pretty flat gain. The Yagi is able to be de...
by k8jd
Wed Jan 15, 2020 2:54 pm
Forum: Engineering & DX'ing
Topic: Passive Repeaters On Hilltops
Replies: 8
Views: 302

Re: Passive Repeaters On Hilltops

One place I worked at did a test of a "passive repeter" scheme in down town Detroit for UHF two way radio. The customer had trouble reaching the company repeater with 4 watt hand held radios in a basenment. Our Pickup antenna was in this basement area of a 4 floor building and the High gain Yagi was...
by k8jd
Sat Jan 04, 2020 4:34 pm
Forum: Engineering & DX'ing
Topic: DIY antenna designs for attic?
Replies: 8
Views: 364

Re: DIY antenna designs for attic?

Ceiling may be 4 ft higher than a desktop antenna = not much difference. Gotta figure out how to get on the building roof :D
by k8jd
Sat Jan 04, 2020 4:09 pm
Forum: Engineering & DX'ing
Topic: DIY antenna designs for attic?
Replies: 8
Views: 364

Re: DIY antenna designs for attic?

Almost ANY full size, gain antenna for UHF will fit in most attics, get a rotor to turn it. Nothing special about an attic unless you have a metal roof or lots of metal (heating ducts, AC power wiring)up there already !
A halfwave dipole or EDZ is a bit wimpy for UHF reception !
by k8jd
Sat Dec 28, 2019 7:48 pm
Forum: Engineering & DX'ing
Topic: Realistic DX 370
Replies: 4
Views: 276

Re: Realistic DX 370

I have a DX394. quite a bigger radio, AMBC to 30 MHz, AM CW SSB receiver.
by k8jd
Sat Dec 28, 2019 7:40 pm
Forum: Engineering & DX'ing
Topic: Realistic DX 370
Replies: 4
Views: 276

Re: Realistic DX 370

I tried clicking on the "image but got nothing, maybe this forum prohibits image files /
by k8jd
Sun Dec 15, 2019 1:26 pm
Forum: Engineering & DX'ing
Topic: Tower In Clarkston M-15 and Dixie Highway
Replies: 3
Views: 289

Re: Tower In Clarkston M-15 and Dixie Highway

OK, it's the local cable TV Co, head end tower ! That's why all the TV antennas, for local plrograming distribution and the big satellite ant on the ground for the other networks. I guesss the Independance Township FD took down their VHF antennas when they got on the Oakland Co digital comm system. ...
by k8jd
Sun Dec 15, 2019 1:19 pm
Forum: Engineering & DX'ing
Topic: Tower In Clarkston M-15 and Dixie Highway
Replies: 3
Views: 289

Re: Tower In Clarkston M-15 and Dixie Highway

I have been in that area many times, know there is a tower at the fire station just up the hill from what you mentioned. The FRN registration shows it was there as early as 2016 . Will try google earth to see if that is the FD Comm antenna tower.
by k8jd
Thu Dec 12, 2019 4:20 pm
Forum: Engineering & DX'ing
Topic: Trials of restoring Heathkit DX-35
Replies: 24
Views: 851

Re: Trials of restoring Heathkit DX-35

The rectifier tube may have been a good sub. many of the 5V filament dual diode tubes were using the same pin linup for the elements, only made physically different to handle more or less Plaate current and voltage. .
by k8jd
Sat Nov 30, 2019 6:10 pm
Forum: Engineering & DX'ing
Topic: Tecsun PL880 Tuning Tips
Replies: 5
Views: 185

Re: Tecsun PL880 Tuning Tips

I get some pretty good FM DX when I plug my roof mounted, 30 ft dipole into the unmodified PL880. One Bay City station and WCMU from Mt Pleasant , almost any time of day
by k8jd
Sat Nov 30, 2019 6:06 pm
Forum: Engineering & DX'ing
Topic: Tecsun PL880 Tuning Tips
Replies: 5
Views: 185

Re: Tecsun PL880 Tuning Tips

It's not the FM that can't use the ext ant connector, it's the AMBC and Longwave that needs a mod . You have to wind a few inches of wire around the main AM/LW loopstick and solder one end to ground and the other end to the connection for the ring part of the ext ant conector using a stereo plug. FM...
by k8jd
Mon Nov 25, 2019 4:54 pm
Forum: Engineering & DX'ing
Topic: FCC to allow All-Digital on AM Band
Replies: 14
Views: 550

Re: FCC to allow All-Digital on AM Band

Don't kill the AM band with pure digital. Analog AM that can travel hundreds of miles at night when it all hits the fan needs to be kept. IF, and IF, they feel that they MUST have an all-digital AM signa, then limit it to one small section of the band: the X-band from 1610-1710 only. PERIOD. It ain...
by k8jd
Sun Nov 24, 2019 12:13 pm
Forum: Engineering & DX'ing
Topic: FCC to allow All-Digital on AM Band
Replies: 14
Views: 550

Re: FCC to allow All-Digital on AM Band

I wonder if there will be any compatability with existing AM HD/FM HD receivers like in most automobiles and trucks built in the last 9 or 10 years ? Maybe this will wander from mode to mode of un compatble trasnmission types like AM stereo did ? Sounds like the swamp water is getting deep again ! A...
by k8jd
Fri Nov 22, 2019 12:27 pm
Forum: Engineering & DX'ing
Topic: Scanners
Replies: 9
Views: 545

Re: Scanners

I have had a portable, handheld analog scanner for decades, like to take it on vacations and search for VHF and UHF traffic,. I had it programmed for the Marine freqs and in Hawaii and the FL Keys, I heard very little. On a short cruise I noticed a CB and a Marine VHF radio and asked the pilot how t...
by k8jd
Sun Nov 17, 2019 2:20 pm
Forum: Engineering & DX'ing
Topic: Scanners
Replies: 9
Views: 545

Re: Scanners

With an analog receiver you can hear mostly the aircraft traffic , Railroads, and some fire departments and small business users that have not migrated to digi systems. If you live near water with commercial and serious amateur mariners and fisher men, you can hear some traffic on the marine channel...