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Messages - gil

Pages: [1] 2 3 ... 184
1
Morse Code / Re: XXX
« on: Today at 05:04:30 AM »
I don't think many people know about it.. I knew there was a "Pan Pan" in Morse but didn't remember what it was. Morse now being mostly a hobby, its value as a serious safety tool has been practically forgotten. I once asked the Reverse Beacon Network if they detected any possible SOS, the answer was no. It would be so easy to add a few lines of code to all those Morse skimmers to raise an alarm on detecting SOS or XXX.

I wouldn't count on it, but what else can you do? Sending an SOS would definitely draw LOTS of attention, but you might not need nor want that. I'd say use it and hope someone remembers... Otherwise, they might just answer your CQ to get a contact, no harm in that... Well, unless they give you a 599/73 and disappear!

Gil.

2
Antennas / Re: Mounting Antenna for NVIS vs DX operation ?
« on: May 19, 2018, 04:13:22 AM »
That uBitx will serve you well. Keep us posted!

Gil

Sent from my SM-G928F using Tapatalk


3
Technical Corner / Re: Modding MTR4b for 13.8 volts..... possible ?
« on: May 19, 2018, 04:11:26 AM »
The 7812 is not adjustable.. I did the diode thing once but the drop was more like 0.4V 1N4004..
Gil

Sent from my SM-G928F using Tapatalk


4
Technical Corner / Re: Modding MTR4b for 13.8 volts..... possible ?
« on: May 18, 2018, 05:24:30 AM »
Hello,

You could use a 7812 voltage regulator, make a car adapter with it.. Otherwise, three Lithium Ion cells will give you 12.6V max, which works. You put that little 7812 in a little plastic box in your car and you're good to go. You could even put it inside the MTR4b with a switch and add a DC input jack for higher voltages...

Gil.

5
Antennas / Re: Random wire antennas and tuners
« on: May 17, 2018, 02:08:26 PM »
Quote
I am not sure and pretty clueless if the tuner is maybe malfunctioning.

Probably. I would re-check your wiring, there has to be a mistake in there somewhere...

Gil.

6
General Discussion / Re: Remove old private messages please.
« on: May 17, 2018, 05:30:35 AM »
Thank you. It is no longer an issue now. I added lots of space...

Gil.

7
Antennas / Re: MR100 Cheap Chinese Antenna Analyzer Review.
« on: May 16, 2018, 01:11:51 PM »
Quote
I have this Mini60S is this similar to yours Gil?

Hi, I think it is similar, just a different box...

Gil.

8
Tactical Corner / Re: Sending Encrypted Messages in Morse Code.
« on: May 15, 2018, 06:04:23 PM »
Thanks John, nice insight.
Gil

Sent from my SM-G928F using Tapatalk


9
New To Radio / Re: What do I need?
« on: May 15, 2018, 09:11:20 AM »
Excellent, keep us posted!
Gil.

10
Antennas / Re: Mounting Antenna for NVIS vs DX operation ?
« on: May 14, 2018, 10:44:11 AM »
Quote
didn't get 1 contact all afternoon. I'm using an old military design

It's probably not the greatest idea to copy the military design, as far as wire lengths are concerned. They are not optimized for the ham bands. Better use half-waves of the bands you want to use. Also, the evening is much better for NVIS on 40 and 80m, after sunset.

Gil.

11
Technical Corner / Re: New QRP Labs 5W CW Transceiver Kit.
« on: May 10, 2018, 05:59:59 AM »
Quote
Did you find a good enclosure for your 80 meter rig?

Yes, Hammond 1590BB, perfect fit! You do need to put the controls off board, except the antenna BNC.

Gil.

12
New To Radio / Re: What do I need?
« on: May 09, 2018, 08:00:09 PM »
Nice! I might get one of those tuners...

Gil.

13
New To Radio / Re: What do I need?
« on: May 09, 2018, 10:17:07 AM »
Keep us posted!
Gil.

14
New To Radio / Re: What do I need?
« on: May 08, 2018, 01:36:11 PM »
Quote
So I could use that Zmatch tuner with the tribander for optimal swr?

Absolutely.

Gil.

15
New To Radio / Re: What do I need?
« on: May 08, 2018, 11:48:15 AM »
Hello,

Quote
I am wondering why they use BNC connectors on all of their products? Aint those UHF connectors better?

Most QRP radios and military radios use BNC, probably they are smaller, quicker and more secure. I don't think UHF is better. I don't have a single HF device that uses UHF connectors... If you are going QRP, better switch over now...

You would use a 9:1 UNUN with a "random" wire, which is any wire length not close to a half-wave on any band you want to use. With a half-wave wire, you would use either a 49:1 transformer or an HWEF tuner. The Z-match tuner might be able to match a random wire but you have a better chance of finding a match with a UNUN to lower impedance. The random wire is unbalanced... Get an adaptor for the back of your 817 and leave it there, forever and ever!

Good choice of the QRPGuys Tri-bander. You probably won't need a tuner on 20m and maybe not on 30, probably needed on 40.

Quote
I decided to go with the RG58C/U cable as a feedline in portable ops... Good choice?

Yes. You will find however that it is quite big... For lengths beyond 10m, it is a good choice, but again, takes up a lot of space. I use RG-316. It is about the same size as RG-174, which I also use, but stronger, albeit not as flexible. If you really want the best look at LMR-240/UF.

Gil.

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