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Messages - syfr

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HF Beacons / Re: 8 MHz Western USA Beacons
« on: September 04, 2018, 1937 UTC »
Likewise...appreciate the post

Thanks for the update zazzle. I think your analysis is correct. I would certainly agree with not broadcasting the location.  A mo e of lovation seems wise also. Thank you for maintaining this weekend . It's really only chance we in the US to Log a European beacon.

 Also super interesting to read off your photojournalism documenting both your beacons construction and placement . Please keep up the good work

For Sale / Wanted / Re: T-368
« on: June 29, 2018, 0153 UTC »
Great rigs!!!

Quote from: digitalmod link=topic=40022.msg148374#msg148374 date= was....Its1516834535
:D  It would appear some one just is not reading the engineering papers. Class E RF amp was developed at 13 MHz for 200 watts, in 1997 ! Authors use IRF 440 in push pull.
QEX article states class E better above 3 MHz, D below. Also the QEX article states Class E FETS have produced 100 KW transmitters , obviously in tandem in 2001 !
So clearly today in 2018, to ask 200 watts at shortwave a piece of cake,

http://www.its.caltech.edu/~mmic/reshpubindex/papers/RFdesign.pdf :-X

QEX is a ham rag.... (Its been years since I've seen it). Hams have been using class e for a good while.

Water is a great and cheap way to sink heat.

The RF Workbench / Re: A newbie question about a transmitter
« on: June 29, 2018, 0025 UTC »
"While they're great little transmitters, the parts, especially the style of transformers he rewound for the mod trannies, are getting as hard to find as hen's teeth. As much as I'm a Grenade man and think the world of it's inventor, stick with something you can easily get parts for and build."

Can you point me to the rewind instructions for what I'm guessing it's the old radio shack transformer? I have one of those and while I'm away from the shack if really like to know how to rewind it.

Having said that Stretchy s toroidal design early makes nice audio too

The RF Workbench / Re: Crystal question
« on: June 27, 2018, 1611 UTC »
Typical protection scheme of the day was a miniature bulb in series with the crystal.

I enjoyed list e ring to the 30m signal. Hope you get the time to get it running but I sure know how life gets in the way of hobbies.

The RF Workbench / Re: Q about strange tuning on a valve TX
« on: June 27, 2018, 1601 UTC »
I seem to remember an old ARRL handbook saying that when max power and plate current dip didnít match, it might be an indicator of self oscillations/spurious emissions from the PA.

Yup...ergo the neutralization process.

The RF Workbench / Re: Q about strange tuning on a valve TX
« on: June 27, 2018, 1517 UTC »
Sounds like the final amp needs to be neutralized. Check arrl publications.

These Re fine transmitters and Stretchy is the man!!

Been trying but nil.

HF Beacons / Re: Mojave beacons from central Cal
« on: June 27, 2018, 0217 UTC »
Windy is a little bit more QSB affected tonght but good copy on peaks. 104F out this evening.

Hrd several below in the 4096 region. Hard to ID with just a portable but Im  pretty sure Haystack is the strongest.

QTH is near Lompoc

HF Beacons / Re: Mojave beacons from central Cal
« on: June 26, 2018, 0210 UTC »
1900 PST.windy is easy copy to central coast. 103 F.   Amazing copy to a portable with telescopic whip.

HF Beacons / Re: Mojave beacons from central Cal
« on: June 26, 2018, 0032 UTC »
105F @ windy at 1730 pdt. Windy coming up out of the noise.

HF Beacons / Re: 6780 kHz CW beacon
« on: June 25, 2018, 1637 UTC »

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