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Messages - gil

Pages: 1 [2] 3 4 ... 191
16
Morse Code / Re: Learn How To Increase Your Morse Code Copy Speed.
« on: August 31, 2018, 05:38:35 AM »
Good one Sparks, thanks.
Gil.

17
Morse Code / Re: Learn How To Increase Your Morse Code Copy Speed.
« on: August 28, 2018, 04:34:52 AM »
Excellent Chris, just keep doing it, it does take a long time...

Gil.

18
Morse Code / Re: Can Morse Code Still Save You?
« on: August 27, 2018, 05:27:00 PM »

19
Military Radios / Re: Czech Military RF-10 Radio.
« on: August 25, 2018, 08:58:01 AM »
Let us know!

Gil

Sent from my SM-G928F using Tapatalk


20
CB / Re: CB as a SHTF option, in my opinion
« on: August 20, 2018, 06:28:01 AM »
Definitely a good band for local communications. Looking back at my CB days, the one thing I lacked the most back then was a good understanding of antennas. I had no idea about the different kinds of antennas I could have used to extend range, beams, Moxon, wire antennas, etc. The standard was the quarter-wave vertical with radials, or the 5/8 like the excellent Solarcon Imax 2000. Mobile antennas ranged from the very good to ridiculous.

Bottom line is, had I studied antennas, I could have gotten much more from CB. That would be my best advise to CBers, study and try many types of antennas!

Gil.

21
Technical Corner / Re: Armored BitX40.
« on: August 09, 2018, 09:27:56 AM »
Back to work!

Actually, thanks to ELK here, Stan, this project just might see the light of day.

Stan is working on the Arduino code to drive the DDS, the Si5351A, to output from 4750 to 5250kHz, which translates to 6950 to 7450kHz for the BitX40.

Here is the list of the keys to be used on the keyboard:

  • Numbers 0-9: Same.
  • Clr: Clear entry, reset.
  • Sto ENT: Enter frequency.
  • Batt CALL: Battery voltage output in Morse.
  • Freq: Frequency output in Morse.
  • Send OFST: + 100Hz. Hold +half-second=+100Hz 5x/sec (+500Hz/sec).
  • TIME: - 100Hz. Hold +half-second=-100Hz 5x/sec (-500Hz/sec).

Also planned are a confirmation beep and an out-of-range beep, maybe a battery low every-5-sec beep below a certain voltage to be determined.
I will let him post about his progress here  :)

Stay tuned...

Gil.

23
Thanks. I guess my new minimum is 11.5V...

Gil.

24
I always used 10.5V as the minimum for lead-acid, SLA and AGM batteries, but I have no idea if that's 50%...

Gil.

25
Antennas / Re: The 49:1 Half-Wave End-Fed Transformer Campain is ON!
« on: August 05, 2018, 03:05:17 AM »
Yep, the proof is in the pudding, not the internet :)

Gil.

26
Antennas / Re: The 49:1 Half-Wave End-Fed Transformer Campain is ON!
« on: August 04, 2018, 05:48:27 AM »
Many of these people have no idea what they're talking about. These transformers do not have high losses. A 240 size core is 90% efficient and a 140 core around 70%. For all practical applications, you'll never hear the difference. What matters is the resonant half wave wire.

Gil.

27
Antennas / Re: Successful Wire Antennas.
« on: August 03, 2018, 12:17:05 PM »
Darn. It seems the file is a preview, albeit a large one...

Gil.

28
Tactical Corner / Re: Sending Encrypted Messages in Morse Code.
« on: August 03, 2018, 06:04:23 AM »
Thank you.

Gil.

Sent from my SM-G928F using Tapatalk


29
Tactical Corner / Re: Sending Encrypted Messages in Morse Code.
« on: August 03, 2018, 05:13:56 AM »
Great info, thank you!

I remember reading that AES might have been voluntarily compromised by the NSA, on the random number generator... Also that AES-128 is better than the 256 bit version...

Wouldn't Blowfish be more secure than AES?

Gil

Sent from my SM-G928F using Tapatalk


30
Antennas / Successful Wire Antennas.
« on: August 03, 2018, 03:10:37 AM »
Hello,

Here is a great PDF file I found on wire antennas. They forgot the W3EDP, but otherwise, it is quite informative. The file is attached to this message.

Gil.

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