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Messages - cockpitbob

Pages: [1] 2 3 ... 75
1
Classifieds / Re: Selling my KX2.
« on: December 12, 2017, 11:44:08 PM »
Somehow I get the feeling that some of the proceeds will go towards a UBTX.  That's what I would do anyway ;)

2
Joel, thanks!  Those are very reasonable power numbers.  This rig is looking more attractive every time I look at it.

3
General Discussion / Re: Crowd Funding The Perfect Survival Radio?
« on: December 11, 2017, 05:10:26 PM »
Does anyone know how much power the uBITX draws during receive?  Battery life is important and nearly an obsession in this forum 8).

4
General Discussion / Re: Hi - I'm the new guy M6UAW
« on: December 11, 2017, 02:35:21 PM »
Hi Andy,
Welcome to the board!  Welcome to the hobby!

Depending on where you are in the UK, there's a chance you and Gil (in France) could hit each other on 2m if you make yourself a cheap Yagi.  Gil has been getting into the weak-signal stuff (SSB on VHF).  Here's his YouTube on building a portable 6-element 2m Yagi.
https://youtu.be/6quIk_X3QIE

Hi guys, Just received my UK Foundation Callsign over the weekend - M6UAW. I only have FM capability on 2m and 70cm at the moment but looking forward to moving into HF comms when the finances allow.
Go see this thread that caulktel just started.  A fully built board-set for a 3MHz - 30MHz SSB & CW rig for $109!  The rig is brand new, so I don't think much is known about it, but it's done by the crew that does the BITx kits, and they have a solid reputation.
http://radiopreppers.com/index.php?topic=1384.0

We truly are in the glory days of ham radio ;D

5
Wow!  Fully built and tested surface mount boars!
Nice find.

No mention of current draw in Rx, but just looking at the board and circuitry it can't be bad.

I'd be ordering one right now, but I'm literally 3 projects behind right now ::) and promised myself I wouldn't buy another kit until I got at least 2 of these done :-\

6
Batteries & Solar / Re: MY CB GO BOX
« on: December 07, 2017, 01:54:51 PM »
Describe your antenna and feedline to it. 
My knee-jerk reaction is to put a 1:1 balun at the antenna.  You've probably got RF on the shield due to driving a balanced antenna (di-pole) with an unbalanced line (coax).

7
Batteries & Solar / Re: MY CB GO BOX
« on: November 20, 2017, 07:52:40 PM »
At a simple level I knew having different polarizations reduces reception, but I never knew any numbers.  Over at antenna-theory.com I found this little gem:  http://www.antenna-theory.com/basics/polarization.php

Quote
In general, for two linearly polarized antennas that are rotated from each other by an angle , the power loss due to this polarization mismatch will be described by the Polarization Loss Factor (PLF):
 
Polarization Loss Factor

Hence, if both antennas have the same polarization, the angle between their radiated E-fields is zero and there is no power loss due to polarization mismatch. If one antenna is vertically polarized and the other is horizontally polarized, the angle is 90 degrees and no power will be transferred.

So now I have a rule of thumb and numbers I can work with.  I love numbers ::) .  I think the equation falls apart around 90degrees because it predicts zero, but in the real world, the polarizations are probably imperfect so even if the antennas were 90.00deg off, some will get through. 

But here's my big take-away.  At 45deg the power transfer is 50%.  That's only 1/2 an S-unit.  You could cant your 4-element Yagi 45deg and its 8dB of gain would only drop to 5dB gain.  You could do fine talking to both repeaters and SSB operators without having to fuss with the antenna.

8
Antennas / Re: New Elecraft AX1 Antenna.
« on: November 19, 2017, 11:51:17 PM »
Welcome aboard Retops!  Being a QRPer and CWer almost seems mandatory to be on this board.  It's not but glad to have another!

I'm watching this too. I'm a hardcore slingshot and EFHW antenna guy, but there are some treeless peaks north of me I want to activate.  A portable vertical would be perfect.

 I too have a KX2, but mine is so new I haven't transmitted with it yet. 

9
Tactical Corner / Re: Loss of House Water Supply
« on: November 07, 2017, 02:55:37 PM »
Update:  I've learned that my forced water heating system should run fine for a very long time(weeks or months) without house water.  I'll call it a semi-sealed system that works at a lower pressure (12psi) than the house water and only draws in new water if for some reason it loses some.  Apparently if you flush the system the water is supposed to look black.  That means it's been there a long time and no new oxygen has gotten in to help corrode things from the inside.

Knowing that the furnace will keep the house warm even if the town water is out for a week is a big comfort.  One reason I got the generator is around here people have been without power for over 2 weeks in winter and unless they had a wood stove their houses froze.

10
Tactical Corner / Re: Loss of Water
« on: November 07, 2017, 09:41:11 AM »
Water is the most valuable but hardest to prep for, it takes up a lot of space to store it, gets heavy quick, and requires maintenance.

The best set up I have seen for water storage is plumbing a 275 gallon storage container in to the houses water system. Once the tank is full as you use water in the house it draws it through the tank just like a hot water heater. This allows the water to be constantly circulated. The down side is when the main goes down you will have no flow unless you plumb a pump (preferably 12 volt) it the system. Or drain into buckets.

We have 2 of these tanks at my moms place, I still need to plumb them into the system. Iím looking at plumbing into the sprinkler system so I can keep the tanks in the back yard and out of site.



Sent from my iPhone using Tapatalk
Nice!  I worry about it handling the pressure of house water, but something like that has a lot of potential.  We don't plan on being in this house more than 5 more years, so this idea is for the next house.

Water was restored late last night, so life is back to normal.  I think my biggest take-away from this is the realization that my house's heating system is forced hot water and I don't think it will work without the house's water supply.  I need to research this.  In winter we can go a month without seeing temperatures above freezing.  If we lose water for an extended period I'd be heating my house with electric heaters and hair dryers.

11
Tactical Corner / Re: Loss of Water
« on: November 07, 2017, 09:38:41 AM »
And I thought you were going to talk about delivering babies...  :o

The stream is great, but you would need to have a mean of transporting that water back to your house, more than a couple buckets at a time... The stream could be contaminated too, so I'd definitely get a tank like Joe suggests...

Gil.
Babies....yeah, when I read my own thread title of "Loss of Water" this morning that was the first thing I thought too.  I just changed it ::)

True about the stream.  But a mile isn't too bad with either the car or my ride-on mower towing the dump cart (or walking the cart if the fuel supply runs out).  For now it would be mainly for flushing toilets since this isn't a SHTF situation and I can go buy bottled drinking water after my 30g water heater is empty.

12
Tactical Corner / Re: Preparing for an EMP (Electromagnetic Pulse)
« on: November 06, 2017, 10:24:37 PM »
Also someone else may know more about that than me but the older vehicles had a lot of fusible links on them and I'm not for sure if those would hold up or not.

Sent from my 5049Z using Tapatalk
I'm pretty sure the fusible links will be OK (gawd, I hated just the very idea of them in a car!).  For the short antennas (wiring) in a car the energy received won't be enough to get all those fuses red hot and melted.  The main problem is voltages can be high enough to zap semiconductors.  Especially this modern stuff where the supply voltages for most logic is 3.3V and some as low as 0.9V.  The oxide (glass) gates on the CMOS FETs punches through at less than 3x the supply voltage.  They put pretty good ESD protection on most pins, but still, it's crazy-fragile stuff.

13
Tactical Corner / Loss of House Water Supply
« on: November 06, 2017, 06:50:06 PM »
I thought I was doing OK with my preps, but there's one area I'm not happy with now.  My generator just makes life go on as normal when power goes out, but I don't have any way to deal with a loss of water without feeling a bit like I'm camping.

A water main just broke a couple miles from here and we may be without water for a while.  We've got 2-3 days bottled drinking water and I shut off the valves to the water heater, so I've got 30g there I can get through its drain, but...but...but...there's nothing for showers or to flush the toilets with :o

In my kit I even have one of those WaterBOB things you put in your bathtub and fill with 100g of water that will remain clean and drinkable for a long time, but you need warning to make use of that.  We also have a stream 1 mile from here where we can fill buckets for flushing.  We'll be OK, but I want my whimp-preps to be complete so we are totally comfortable when the bad stuff happens.

Oh, one more thing, I'm glad it's not below freezing outside.  Without water our house's forced hot water heat system doesn't work.  I never gave thought to how really dependent we are on our water utility.

14
You can't go wrong with the FT-60R.  It was my first radio and is still a popular choice.

15
New To Radio / Re: Yaesu FT-60R programming
« on: November 05, 2017, 11:40:59 PM »
Hi Red.  Programming an HT from your phone would be a big convenience!  I don't see why it wouldn't be popular, but I just did a brief search and came up dry.
Good luck with the test!

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