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Messages - gil

Pages: 1 [2] 3 4 ... 191
16
Thanks. I guess my new minimum is 11.5V...

Gil.

17
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.

18
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.

19
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.

20
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.

21
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


22
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


23
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.

24
DMR Radio / New Board: DMR Radio on Radio Preppers.
« on: July 31, 2018, 09:48:00 AM »
Hello.

We have a new board! I need to say that for prepping purposes DMR might and probably should not be very high on your priority list. We assume that during SHTF there would be no grid power, let alone any Internet service. That said, it does allow encryption, which is however illegal in normal times...

DMR has taken the amateur bands by storm, and for good reasons. It is an open source mode. Everyone can implement it into their radios. Although it was designed for commercial radio use, it does work well for amateurs, well enough anyway. There is a learning curve, but honestly, once you learn the vocabulary, it is pretty simple. What's the advantage? It is worldwide... You can talk to anyone anywhere there is a repeater connected to the Internet. Is it real radio? Well, only between the repeater and your handheld, otherwise, no. It's still better than network radio, which isn't radio at all and should be called something else.

In any case, it is hard to ignore DMR today. My take on it is that if you buy an analog radio, you might as well get a DMR/analog radio, since they all do both. So I decided to start this new board. Ya'll have fun now and keep it civil  ;)

Gil.

25
DMR Radio / Worldwide DMR Users File for Retevis RT3S, MD-380, etc.
« on: July 31, 2018, 09:37:56 AM »
First post in this new category!

Since I am using the Retevis RT3S dual band DMR radio, I wanted to import all worldwide users into its database. I found the following site:

https://ham-digital.org/status/

Click on DMR User ID List, space separated fields (ID call name)

The format is not the same as what is used by the RT3S, though it is CSV, but the columns are different. I wrote a small Python program to convert it. The resulting file, which will be attached to this post, does import correctly into the Retevis software, and I suspect will work with other Retevis.TYT radios. I have not tried to insert my new file into the radio, but I don't expect any trouble. Stay tuned for an update and video!

I will update this file every few months...

Gil.

26
Net Activity / Re: Radio Vacation
« on: July 30, 2018, 08:24:37 AM »
So that would be 22:00 for me here in France. Maybe I'll listen on my MTR3b :)
Keep us all updated!
Gil.

27
Antennas / The 49:1 Half-Wave End-Fed Transformer Campain is ON!
« on: July 26, 2018, 07:09:08 AM »

28
General Discussion / Re: Have you tried the 160m band?
« on: July 25, 2018, 03:52:18 PM »
AM definitely sounds better than duck voice SSB!
Gil

Sent from my SM-G928F using Tapatalk


30
General Discussion / Re: Lets Talk Feedlines
« on: July 24, 2018, 05:49:38 AM »
I agree. No doubt RG-58 is better, but you should not lose as much power with RG-174. I don't know about the characteristics of RG-316. I only use it because it is mechanically stronger. There is always LMR-240/UF...

Gil.

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