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Messages - redhat

Pages: [1] 2 3 4 5 6 7 8 9 ... 107
1
Equipment / Re: Any way to modify noisy power supply?
« on: July 06, 2025, 0541 UTC »
Batteries can go bang and catch fire too, ya know... ;D

It should be noted that how filtering is installed will have a large impact on how effective it is.  Understanding how circulating current flows through grounds, chassis parts, etc and how to address them is key to RFI and noise abatement.

+-RH

2
Sounding good in the SE.  How 'bout some isis, or Professional Murder Music?  Rammstein always a crowd pleaser too!

ID around 0321z.
0351z no idea what this is, but it's definately ISB!

Thanks for the heavy sound!!

+-RH

3
General Radio Discussion / Re: FCC down to two commissioners
« on: June 06, 2025, 0248 UTC »
I could also be that more cuts are coming.  It's always better to resign than be asked to leave.

The number of FCC commissioners is codified in law.  Not to be "that guy" who's a wannabe attorney, but it's in 47 U.S. Code § 154.

You act like the law actually means anything ;D

4
General Radio Discussion / Re: FCC down to two commissioners
« on: June 05, 2025, 2157 UTC »
I could also be that more cuts are coming.  It's always better to resign than be asked to leave.

5
Charlie, I know you can't help yourself, but please keep the politics to yourself.  This a technical forum.

That said, all the above points are valid.  Your mileage will also vary depending on the distance to your target, time of day, frequency, and type of transmit antenna employed.  It should be mentioned that some antennas are less forgiving of surrounding terrain than others.  A vertical, for example, has a low angle of radiation.  If you are in a steep valley, or next to some bluffs, a chunk of your radiated signal will hit the cliffs, hills, etc and not make its way toward your intended target.  Under these conditions, a dipole would be a better choice.

Also, if your interested in broadcasting, I would recommend you forgo getting a ham ticket and focus on your efforts in free radio.  Many hams are of the dudley do-right variety and will harp on you about such things, especially playing music.

Modern solid state transmitter technology has evolved to the level that a transmitter in the 150W range can be about the size of a lunch box and run on battery power.  Modern yard power equipment also has large lithium batteries that can run such a transmitter for an hour or so.  Anything beyond that is going to require more batteries, or something less practical like a generator.  This may require a rethink of strategy, or locale.

+-RH

6
For that much money you can buy a schlockwood, which is a real broadcast processor modeled on the Inovonics 235, built by the guy who designed the 235.

https://www.ebay.com/itm/186247469703


+-RH

7
Good signal tonight with selections from Rammstein including 'Radio' 'Engel' and 'Deutschland'  Peaks to S9 on the chinese loop and HF Discovery.  Freq on my SDR is 6284.985 KHz at close.
Thanks for the tunes!

+-RH

8
Apparently I don't have any schemos for the old stuff I built.  I can throw something together, but the through hole versions of the 1496 are NLA.  They are still available in SMD.  Do you have SMD capability?  It might be easier to roll a small board for this.

+-RH

9
Post a link to your shows somewhere on here.  If its any good, folks will pick it up and relay it for you, likely for free :)

+-RH

10
In commercial designs, 13-15 MHz is about the limit for power devices in the 500W class.  Smaller fets you should be able to run quite a bit higher, although 40-50 MHz is likely the practical limit.

+-RH

11
I've built prototype MW AM stereo modulators on breadboards in the past, and it worked.  With digital modulation properly filtered in the digital domain, the only issues you will likely have is spectral regrowth, ie out of band emission.  This is measured relative to carrier level, and at present -40dBc is considered acceptable.

COTS solutions may exist, but I don't know of any at a reasonable price.  If you need some schematics to get you going I can pull some stuff from my archives.

+-RH

12
This is faster and not limited to the step size of your divider.  I've used these to driver commercial transmitters, am stereo exciters, as well as my own rigs.

https://www.ebay.com/itm/186071392182

+-RH

13
All of the companies on that list are large manufacturers located overseas.  No doubt Kyocera or Abracon can make you an SMD crystal, but you'll have to order 100,000 units.

Domestically, you can try Bomar.  If its a common part, they can job shop it overseas and have them made in small quantities.  In this day though, better to look at other options than crystals.
http://bomarcrystal.com/

+-RH

14
The RF Workbench / Re: 15-Watt SHORTWAVE BROADCAST TRANSMITTER
« on: December 30, 2023, 2239 UTC »
FWIW, the top of all pages reads...

"We seek to understand and document all radio transmissions, legal and otherwise, as part of the radio listening hobby. We do not encourage any radio operations contrary to regulations. Always consult with the appropriate authorities if you have questions concerning what is permissable in your locale."

Chris just doesn't want to deal with the legal liability of allowing commercial traffic of questionable goods on his site.  He pays the bills, that's his right to do so.

You also have proven over the years to be rather obtuse and abrasive when confronted with concerns about your commercial activities, and that leaves a bad taste in peoples mouths.

+-RH

15
They have listings all over ebay as well.

+-RH

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