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21
Batteries & Solar / Re: Man Portable Off-Grid Power for Amateur Radio
« Last post by gil on October 17, 2017, 04:48:45 AM »
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Where are we going to find fresh 18650 batteries, when the entire region is scrounging for them!?

I like 18650s. They have a good capacity and can easily be found for free. You would of course have your stock ready before a situation develops, not count on finding them in the field, although there are plenty of laptops floating around. I also use them for flashlights and USB power banks. Those 38120s look very interesting for more current-hungry radios. A pack of seven would make a great Clansman battery, and give the PRC-320, which only draws 175mA, a lot of operating time, but at $32 per cell, ouch! I have a 7S LIPO but if one cell goes bad the whole pack is gone; no such problem with separate cells. The trick is of course is being able to charge them, and Julian, you are the expert here :) I'm following in your footsteps.

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Can you, walk out the door, even only 100 feet away and be on the air in HF in five minutes?
Excellent question Ray; I can fortunately answer yes.
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Are you able to recharge your own station in the wild?
Yep, that too, tough I do not have a backup solar panel nor a way to recharge batteries via mechanical means, wind or muscle driven...

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Forget ARRL Field Day and other contests: this is about sustained communication with zero infrastructure, not giant motor homes, generators and photo-ops during a weekend.

As I've said before, Field Day is not about getting out of the shack but getting the shack out... Every Field Day should start with a five-mile hike carrying your equipment to the field. We would see very different gear then...

Gil.
22
Batteries & Solar / Re: Man Portable Off-Grid Power for Amateur Radio
« Last post by RadioRay on October 15, 2017, 02:50:14 PM »
The Caribbean communication infrastructure failure is a terrible event, but a superb example of WHY stand alone, rapidly portable stations are so important.  The question I had put to friends as well as myself was:

"Can you, walk out the door, even only 100 feet away and be on the air in HF in five minutes?

The follow-on question is addressed here:

Are you able to recharge your own station in the wild?


Forget ARRL Field Day and other contests: this is about sustained communication with zero infrastructure, not giant motor homes, generators and photo-ops during a weekend.


Good thread -


>RadioRay  ..._  ._
23
Batteries & Solar / Re: Man Portable Off-Grid Power for Amateur Radio
« Last post by STN on October 14, 2017, 11:46:24 PM »
Here's the playlist for the portable power for ham radii series.
http://www.youtube.com/playlist?list=PLKMrdrsNkFA43q0POuXM-5-49yOd3t4CP
There's also another battery build incoming http://oh8stn.org/blog/2017/10/12/4s2p-5ah-lifepo4-with-bms/ based on A123 26650 LiFePO4 cells. It's a 5Ah 4S2P protected pack with simultaneous charge and discharge in the field.

I have really started to move away from this idea of counting on using what I can find in the field (eg 18650 batteries) versus  building my gear the best way that I can in the first place. Puerto Rico and the island country of Dominiqu are perfect examples of a real preparedness or survival event. During the first week of the event, people were reaching out to ham radio operators through social media for news and information into and from the region. The biggest problems in Puerto Rico were ham radio operators lost their fixed operating locations, were forced to evacuate, had no grid power, and were lacking portable field renewable power sources. Where are we going to find fresh 18650 batteries, when the entire region is scrounging for them!?
Now I focus on building my knowledge and skills on portable power, while simultaneously building my own reliable gear. This last part was just thinking out loud.

Julian
24
Technical Corner / Transmitting a wired telecom
« Last post by ghog2121 on October 14, 2017, 10:45:24 AM »
Hey ya' all, I am newer to the radio scene.
I am trying to transmit a David and Clark wired intercom system up to 100 or so yards to another vehicle.. looking for ideas, advice, or if someone could point me in the right direction i would appreciate it.



Sent from my iPhone using Tapatalk
25
CB / Re: Best CB radio for inside a jeep
« Last post by Broncus on October 12, 2017, 10:03:26 AM »
Many radios tend to offer a WX receive ability. And it seems that many people end up not using WX ability for some reason or another. I am one of those people.

My recommendation would be to get a weather radio separate from your CB, etc. Many will do S.A.M.E which may be convenient. It will be portable and can travel with you when the Jeep is not present. My daily driver has my radios. The vehicle (4Runner) my wife drives has no radios (hopefully I'll remedy that). It is used to pull the camper. While camping I still have my WX receiver even if I don't have my other radios.

Best regards,
Fred
26
General Discussion / Re: 3.818MHz Net on Sunday nights
« Last post by Quietguy on October 10, 2017, 12:21:14 AM »
They're sure proud of that unit! Did I really see them for $1500? I'm looking at the County Comm setup.

They have been discontinued but there is currently one on ebay for $200 Buy-It-Now.  I have had one for years and I like it, but I can't imagine anyone paying $1500 for one.  The CountyComm GP5-SSB is a nice little receiver, but the TH-F6A is a tri-band (2m/1.25m/70cm) handheld transceiver with wideband receive coverage - a completely different thing.

Wally
27
General Discussion / Re: 3.818MHz Net on Sunday nights
« Last post by myascape on October 09, 2017, 10:25:33 PM »
I have a newbie question. What is a good handheld or mobile set to pick up 3.818?

Sent from my XT1635-01 using Tapatalk

The Kenwood TH-F6A will pick up 80 meters on the internal bar antenna however an external antenna is much better.
They're sure proud of that unit! Did I really see them for $1500? I'm looking at the County Comm setup.

Sent from my XT1635-01 using Tapatalk

28
General Discussion / Re: 3.818MHz Net on Sunday nights
« Last post by LWolken on October 09, 2017, 10:19:19 PM »
I have a newbie question. What is a good handheld or mobile set to pick up 3.818?

Sent from my XT1635-01 using Tapatalk

The Kenwood TH-F6A will pick up 80 meters on the internal bar antenna however an external antenna is much better.
29
Net Activity / Re: Radio Vacation and Update.
« Last post by gil on October 05, 2017, 09:34:35 PM »
The difficulty here is that max gross weight is 450kg, 991Lbs... So the plane would have to be very very light... No alternator, battery, starter, no electrics, light fabric, and all the tricks possible to lose weight, including myself! The biggest issue is that a lighter engine would stick too far out. A Ford model A weighs around 265Lbs.
Empty weight is presumably 625Lbs with Ford-A, but people end-up with 650 to 750Lbs. I would have to end at around 590Lbs empty with a lighter engine and longer nose... Quite possible.

Gil.
30
Net Activity / Re: Radio Vacation and Update.
« Last post by cockpitbob on October 05, 2017, 08:58:43 PM »
Yup, stay air cooled.  Not only is there more weight and more to go wrong in a water cooled engine, but those Model-A engines aren't that reliable and I have to wonder if there's anyone in your part of the world that knows about them, like how to pour new babbit main bearings.

Aside from that, to me the biggest negative would be the radiator right in front of me.  Besides making spotting traffic a problem (constant s-turns as I fly?) I fly to sight-see.  What I love about parasol planes is you have all the fun and style of a bi-plane, but without that bottom wing getting in the way.
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