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Messages - CPR

Pages: [1] 2 3 ... 7
1
Well I saw the video.. It looks like a toaster or oldschool radio. If you got that used I should get some radioactive testing probes to check the geigermuller tube if its still working.
You can try to convert röntgen to sieverts using this: https://www.unitjuggler.com/equivalentdose-umwandeln-von-rem-nach-Sv.html
0.5 Röntgen is 5 mili Sieverts. Thats pretty high. I am not sure if the unit you have shows those readings in unit per hour or what?

2
Reviving an old topic...
I got myself a TerraP+ geiger counter. They seem to be pretty good, in Ukraine and Japan they are beeing used a lot. I live near a nuclear power plant (30km), so that's a wise investment IMO. Once or twice a week I measure the gamma dose. Actually I made a video once about radiation 101, trying to solve some mysteries about it:

https://www.youtube.com/watch?v=RUolaiQoBrs

Anyway, I dont think TEOTWAWKI will ever happen. The government will establish law sooner or later. IMO prepping is just about to fill the time gap of lawlessness until it is functioning again.

3
Antennas / Re: Linked Dipole
« on: June 20, 2018, 02:33:54 PM »
I still need a wolphilink for my 817, but yes, thats a good idea for a comparison!

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4
Antennas / Linked Dipole
« on: June 20, 2018, 08:29:30 AM »
For quite a time I was interested in building a resonant multiband dipole or linked dipole.
I see a lot of benefits in it, especially no tuner is needed therefore no loss for qrp. Although you have to carry a bit more of equipment, the linked dipole should perform the best regarding noise and stuff - so they say.

Anyway, I got myself the dipole center with a 1:1 balun kit from sota beams.
I found a great tutorial on how to trim the wire :

http://amateurham.co/4-band-linked-dipole-how-to/

So in the following days I intend to build the linked dipole and will keep you updated.
I'm quite curious about the performance compared to the random wire end fed antenna. I intend to use this linked dipole with my 6 meter telescope pole.



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5
New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 20, 2018, 03:40:42 AM »
Quote
I seriously doubt I will be running around performing comms ops like some guys plan.  More than likely it will be if and when its time to move to a new location.

Running high power rigs in the air in SHTF is like drawing a target on your back. Also you need to change locations often or your shack will become a target.
In the civil war in Yugoslawia, HAM operators had an important role in relaying information to the army as the Croatian army and informational infrastructure was not present / cut off. Resulting in pinpointed attacks from the aggressor on villages with active ham operators. Just sayin. If they saw an antenna on your roof, your house was gone.

6
New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 19, 2018, 04:08:46 PM »
I value cw as it is but have no intention to learn it for now as I see no need.

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7
New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 19, 2018, 04:31:18 AM »
Yes, CW is the top of the energy efficiency.. It's like a VW BlueMotion or a state of the art hybrid car. But not everybody can afford (learn) it. Although CW seems like a really useful thing to know, I personally prefer talking SSB.
I can charge my 18650 via USB and my Anker solar panel. It can deliver 2A tops, enough to charge my batteries to stay online. I have my diy 3s2p 6Ah 18650 pack. I can take out 3 and run 3Ah while the others charge. With my 817 I can stay online quite a time with 3Ah. Although I would not waste energy too much, rather stick to the 3-3-3 rule for SHTF.
I built in a BMS to that pack, I could even charge them with solar. But this panel delivers 5V, converting it to 12V won't do the trick as the Amps will drown.
Maybe, I'll get a decent 12V panel someday, but I don't see the need right now, not when I don't have a current-hungry amp.

If you buy your rig primarily for fun, then go with 100W, if you buy it from the prepper side of view, I'd suggest for QRP rigs. There is no need to get through a pile up when SHTF  ;D

8
New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 19, 2018, 02:58:13 AM »
Yeah... Like when I was talking Croatia Moscow 1850km on 5W SSB and some wise guy flattened me with his 1.5kw station. Great stuff! The guy in Moscow was not amused, my S meter almost blew up. Of course it's great to have a power reserve in the sleeve to activate if necessary. I'll get an amp myself, the small portable 50W amp for the 817.
But, what's your goal in emergency preparedness? Doing DX contacts with 100W, even considering that there could be a grid down and most of the hams are out of order and the air is much cleaner?
I don't know. For me its enough to get continental, staying inside Europe. I mean, that could secure your survival. It depends on what goals you have for your emergency ham stuff. I see no need to talk to USA or Japan if a disaster strikes. It's enough to hear what is happening there, if I have to communicate I don't see a reason to go outside Europe. That said, 5W is an acceptable power, also considering the ease of carrying that rig around. Someone using 100W for +2 days of field use has to haul more than 4 times the weight (even more) than I do.
Id rather be mobile and quick on foot in a SHTF and using 5W, than slow, overloaded and burning all my calories just to haul my 100W righ with solar power and 2 kilos of batteries around.


Check that out: https://www.youtube.com/watch?v=u_u1ss3GXcI

9
General Discussion / Re: Gil is a Time Traveler - PROOF! (atachment)
« on: June 19, 2018, 02:55:22 AM »
HAHAHAH that's a good one  ;D

10
Antennas / Re: Random wire antennas and tuners
« on: June 14, 2018, 07:32:00 AM »
Will try that. Thank you!

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11
Digital Modes / Re: I tried FT8 last night!
« on: June 14, 2018, 07:28:27 AM »
Sure won't do that again! :o

I knew it probably wasn't for me, but with all the hooplah, I had to give it a try, at least to know what I'm talking about if ever that conversation pops up in good company... I even made one contact. For me, it's like watching paint dry, utterly useless and uninteresting. I'm not bashing FT8 users or even FT8 here, but it just isn't for me, by a very long shot.

I used the same software however for WSPR, to see my antenna radiation pattern, very useful, got Venezuela on 40m 2W. Of course with WSPR you don't put anything in your log, but I couldn't care less about my log. I actually only input contacts maybe half the time, when I don't lose my notes, forget to write the date or call signs...

Radio for me is about human interaction if only to ask what antenna someone is using... A few words about the weather, even a simple FB, exchanged between two people, make my day.

Gil.
I am new to ham but my few contacts were just signal reports for the log :( as soon I try to start a conversation, the other hams block with 73. It's quite sad.

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12
Antennas / Re: Random wire antennas and tuners
« on: June 14, 2018, 06:26:40 AM »
You might want to try a different wire length for 40 and 80m. Also, try a different coax length and maybe a counterpoise. Random wires can be a pain, but they do allow multiple bands...

Gil.

I took the wire length from here: http://udel.edu/~mm/ham/randomWire/ (84ft wire with 17ft counterpoise). I got a counterpoise, but I am uncertain how to lay it out. I tried directly beneath the radiating wire when horizontally for NVIS, and I tried 90 degrees. But if the unun is in the air several meters, then most of the counterpoise wire is hanging down. ???
I used 5m coax. With 10m coax I got worse SWR readings. I don't know, is my coax maybe acting as an antenna to? Do I need a choke?

13
Antennas / Re: Random wire antennas and tuners
« on: June 14, 2018, 06:07:52 AM »
I was out yesterday to test out the 9:1 with a random wire.
I can say, it is really quiet! At home I got QRM on s7, out there it was 0. Very, very quiet antenna! I also built a RF choke balun / air choke but I see no difference. A thunderstorm kicked in and I had to sit it out, cooked some meal in the meantime.
Anyway, I had a QSO with Moscow, that is 1850km away on 5W! And I can't tune it to 40 and 80 meters. I dont know why. Unfortunately my antenna analyzer was switched on all the time and drained the battery so I could not see the SWR on the randomwire Unun without the tuner. I added a longer tentpeg to the counterpoise as some kind of a ground but did not notice any improvement at all.
Next time I have to take the antenna analyzer with me to get sure. Anyway, I am pretty pleased with the random wire. It is easy to set up! I set it up horizontally to the ground, hoping, I could get some local contacts but I did not. Weird. I made a video about it.

https://www.youtube.com/watch?v=EV4glRZnELQ

14
New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 14, 2018, 03:29:12 AM »
I know that CW is the best energy efficient method, but for a beginner I think SSB is a good start. I had a QSO with Moscow yesterday (1800km) on 5W SSB. Getting through pileups with a  QRP rig on SSB is very frustrating. But for me it's fun. Sooner or later I will get a 50W amp for sure.
But for beginners, I don't know if CW will be learned right at the start - I guess not.

15
New To Radio / Re: New to HAM Community What is a good beginner rig?
« on: June 12, 2018, 02:06:23 PM »
The main advantage of qrp rigs is power drain. Qro rigs in qrp mode drain much more power than pure qrp rigs.

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