Bitcoin donations to: 1CE9UfWJcHBYkWPns7iqBqZgKhd5xfqEaM thanks!
Buy Bitcoins easily by clicking HERE!

Recent Posts

Pages: 1 ... 8 9 [10]
Military Radios / Pedestrian Mobile Radio With The PRC-320.
« Last post by gil on November 27, 2017, 01:57:09 PM »

Radio Reviews, Questions and Comments. / AnyTone Dual band USB port
« Last post by htfiremedic on November 26, 2017, 05:06:20 PM »
Does anyone know what the USB port on the head of the AnyTone Dualband is used for?  I thought maybe programming, but it won’t recognize the radio. 

Sent from my iPhone using Tapatalk
Technical Corner / Re: Armored BitX40.
« Last post by Andywragg on November 25, 2017, 02:11:32 PM »
Well looking at the circuit schematic, if you aren't going to use the supplied 10K pot to tune the VFO, then pins A0-A3 and A6 and A7 that are tracked to the CONTROLS header will be unused.

On the OSCILLATORS Header there are a number of pins unassigned already, D2 to D7 this should give you enough pins to map using the schema that Cockpitbob came up with.

Technical Corner / Re: Armored BitX40.
« Last post by gil on November 22, 2017, 01:22:34 PM »
Hi, no, I haven't gotten that far...

Technical Corner / Re: Armored BitX40.
« Last post by Andywragg on November 22, 2017, 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

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

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 I found this little gem:

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

Please do, thanks!

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?
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. 
Pages: 1 ... 8 9 [10]