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Recent Posts

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1
Technical Corner / Re: Armored BitX40.
« Last post by gil on Today at 01:22:34 PM »
Hi, no, I haven't gotten that far...

Gil.
2
Technical Corner / Re: Armored BitX40.
« Last post by Andywragg on Today at 07:54:52 AM »
Hi Gil, Hope you are well,

Have you figured out what size arduino you need yet, to accommodate the keypad IO connectivity?


Best regards

Andy
3
Technical Corner / The Weber Soda Pop Morse Code Radio, Boxing Up & Contacts.
« Last post by gil on November 21, 2017, 02:25:04 AM »

Gil.
4
Batteries & Solar / Re: MY CB GO BOX
« Last post by cockpitbob 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.
5
Batteries & Solar / Re: MY CB GO BOX
« Last post by gil on November 20, 2017, 05:57:28 PM »
Quote
I will keep you posted!

Please do, thanks!

Gil.
6
Batteries & Solar / Re: MY CB GO BOX
« Last post by NF822WNY on November 20, 2017, 03:55:48 PM »
I am now into the market for a solar panel to recharge and run my Go Box with a 40 amp hour Bioenno LiFepo4.  What are some suggestions for panel?
7
Antennas / Re: New Elecraft AX1 Antenna.
« Last post by cockpitbob 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. 
8
Antennas / Re: New Elecraft AX1 Antenna.
« Last post by Retops on November 19, 2017, 11:04:56 PM »
I am very anxious to try out the new AX1.  A collapsible whip antenna coupled with my KX2 would be perfect for my travel radio and for fun trips outdoors like mountain-topping.  Closest thing I have found to it is the Super Antenna MP1 which works well for CW but is a not as portable as I would like.  Realize there is no getting around the laws of physics, but hope springs eternal.

New to this group and happy to be here.  I am active QRP on 40 and 20 mostly.  73
9
General Discussion / Re: 3.818MHz Net on Sunday nights
« Last post by Sparks on November 14, 2017, 07:29:42 PM »
BTW - is there a place to look up SW transmission information? That is a list of transmitters on the air.

There certainly is! I bought my very first edition of this outstanding book some 55 years ago:

http://www.wrth.com/    http://www.wrth.com/whatiswrth.html
10
General Discussion / Re: 3.818MHz Net on Sunday nights
« Last post by Quietguy on November 14, 2017, 06:39:18 PM »
BTW - is there a place to look up SW transmission information? That is a list of transmitters on the air.

Several, one is http://www.short-wave.info/, which shows HLL Seoul Meteorological Radio (Korean, Japanese, English, Chinese) on 5858 kHz or R.FARDA in Persian on 5860 kHz.

There are also smart phone apps with schedules.

Wally
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