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 permissible in your locale.

Show Posts

This section allows you to view all posts made by this member. Note that you can only see posts made in areas you currently have access to.


Messages - redhat

Pages: 1 2 3 4 5 6 7 8 9 [10] 11 12 13 14 15 16 17 18 ... 106
136
Equipment / Re: MFJ-209C for medium wave tests?
« on: May 01, 2021, 1512 UTC »
I still have my RigExpert Zero, which I bought on your recommendation Chris.  I bought the 35 Zoom simply so I didn't have to keep dragging a laptop to the base of the antenna every time I was in the field setting up for a show ;D

+-RH

137
Equipment / Re: MFJ-209C for medium wave tests?
« on: May 01, 2021, 0123 UTC »
I never liked the MFJ analyzers; too easy to damage by inadvertent static, etc.  I bought a rigexpert AA-35 Zoom last year, couldn't be happier, and it goes down to 60 KHz.  And yes, I have used it on a psudo-part15 station.

+-RH

138
With the changing of the guard at the commission, this may have the desired effect.  It is rather satisfying to read such roasting in legalese ;D

Maybe all the racket on 43 meters will go away soon, just in time for the coming of the new cycle.

+-RH

139
4180 KHz USB 3KHz audio good reception with a few shallow fades.

0157 Alex Mattson feat. Solamay 'UFO'
0201 UFO 'Cherry'
0204 UNID mumble rap track
0206 Goats screaming over an UNID rock track UFO 'Too Hot To Handle'
0210 OP, sounding very much like DJ Dickweed.  Into a nebulous slow paced track.
0213 'Goat Hearder Radio' ID, OP talking about first class phone.
0218 OP "No, no, no, I'm not dickeed, I'm his evil twin!" into song "Dead Puppies"
0220 'I am the witch doctor'

Thanks for the show!

+-RH

140
Amateur Radio / Re: TX noise figures from today's HF transceivers?
« on: April 19, 2021, 2322 UTC »
The only splatter I hear when surfing the bands are those running dirty linear amplifiers.  It also seems to follow that there is little "intelligence" modulated on these dirty signals.

+-RH

141
The RF Workbench / Re: Building an HF amplifier
« on: April 17, 2021, 2022 UTC »
FWIW, you could buy one of the many kits off ebay such as... https://www.ebay.com/itm/MRF300-LDMOS-600W-HF-LINEAR-AMPLIFIER-1-8-54MHz-BOARD/233929540038?hash=item36774981c6:g:dYMAAOSwwkhgQO9Z

Just supply fets, heatsink, and off you go.  600W fairly simple as all the hard work is done for you.

BTW you can do high level SSB using the kahn method.  Continental and others have been doing it for over 30 years...without DSP, and at hundreds of KW.

+-RH

142
The RF Workbench / Re: Building an HF amplifier
« on: April 17, 2021, 1815 UTC »
I'd stick to the BLF188XR as you can get an easy 800W from 5W driving. The 200W kits with IRF devices are fairly old designs and not the best.

Depends what you're looking for?

Band switching is the most problematic part!

Str.

BLF188/184 are now EOL pending replacement devices which have yet to be released.  I found that out repairing a 5KW FM recently.

Also keep in mind unless you are willing to solder the devices to a heatsink, the newer gemini devices are totally unsuitable for full limit linear service.  Lots of power in a small space, a thermal management nightmare.

+-RH

143
Thank you Red Hat. Do you have any Beyond the Horizon or Pusifer???

Yes...coming up!

Special thanks to MRI and RI for making this happen tonight!

+-RH

144
General Radio Discussion / Re: Looking for a Volunteer Or Two
« on: April 11, 2021, 0353 UTC »
Thanks for your efforts Skip!  Also, thanks to Chris for giving us this playground in the first place :)

+-RH

145
While not technically a pirate, I was made aware of several temporary tis style stations licensed through Ntia for information about covid testing locations and directions.  Most were associated with hospitals, churches, and community centers.

+-RH

146
Equipment / Re: Interesting Chinesium SI4732 Shortwave/Air/FM
« on: April 02, 2021, 0356 UTC »
Why the interest in this, form factor perhaps?  I would guess this is the chipset used in all the Chinese cc radio clones?

+-RH

147
Other / Re: OTHR on 40 Meters 2339 UTC 29 March 2021
« on: April 02, 2021, 0349 UTC »
I'm sure you know this, but the 7200--7300 Khz spectrum is only available to amateur radio users in ITU region 2, North and South America.  The rest of the world recognizes this segment as a broadcast band.
...just in case some folks don't know that.

+-RH

148
Frequency?

+-RH

149
I also heard through the grapevine that ihateradio is making large cuts to engineering and programming.  Some engineers are now tasked with keeping 50 or more signals on.  There is also rumors that the format lab is back again with a new twist....audio will now originate from a system at the transmitter.  All stations running the same format will run the same log, coast to coast.

This comes on the coat tails of a UK company now controlling almost half of the company.  The end is nigh.

+-RH

150
An AM allocation includes 10 KHz of modulation each side of carrier.  Per the NRSC 5 description of mode MA3, there are two modes; standard mode which includes the primary and secondary digital sidebands (18.4KHz total), and a reduced digital mode which includes only the primary digital sidebands (9.81 KHz total).

This is outlined in NRSC 5 found here. https://www.nrscstandards.org/standards-and-guidelines/documents/standards/nrsc-5-d/reference-docs/1012s.pdf

+-RH

Pages: 1 2 3 4 5 6 7 8 9 [10] 11 12 13 14 15 16 17 18 ... 106
HFUnderground T-Shirt
HFUnderground House Flag
by MitchellTimeDesigns