Community Digest

Top new questions this week:

Coax in the wall, or around the house?

I am mounting a hex-beam antenna to the peak of my house (assuming that I can find someone with a cherry-picker or a scissor-lift that can help me get it up there). Right at that end of the house is ...

coaxial-cable rfi antenna-system feed-line  
user avatar asked by Don Levey Score of 4
user avatar answered by tomnexus Score of 4

Advice on constructing half wave dipole with reduced velocity factor for site that is not quite big enough?

I want to construct an antenna competent on the 160m band, but I haven't got quite enough space, here's my thinking, please let me know if/what you agree/disagree with. I have a plot of land with ...

antenna antenna-construction dipole  
user avatar asked by spl Score of 3
user avatar answered by tomnexus Score of 3

How can I key low voltage and still keep a tube VFO running constantly?

I'm interested in building a VFO based single tube CW transmitter. These devices are known to have issues with frequency drift and chirp; frequency drift can apparently be mitigated by ensuring ...

diy cw equipment-design vacuum-tubes  
user avatar asked by Zeiss Ikon Score of 2

Greatest hits from previous weeks:

Baofeng UV-5R Receiving Intermittent Static? Please help!

I have a Baofeng UV-5R and I have been using it as a police/EMS scanner. I have used it before and it has worked perfectly. I just recently moved to a new area and yet when I went to listen into the ...

user avatar asked by Madeline Score of 1
user avatar answered by hobbs - KC2G Score of 3

FCC tracking of unlicensed FRS/GMRS transmissions

If a transceiver such as the BaoFeng UV-5R is used to transmit over FRS/GMRS frequencies (unlicensed), it is illegal in the United States due to FCC regulations that state that the power must be <0....

united-states legal fcc frs  
user avatar asked by J. Taylor Score of 15
user avatar answered by natevw - AF7TB Score of 13

Using a Morse code key with a computer?

Are there standard ways to connect a hand key (straight or paddle) to a contemporary computing device (PC laptop with no parallel port, Mac, Android, iOS device, etc.) for developing or improving ones ...

cw remote-control  
user avatar asked by hotpaw2 Score of 19
user avatar answered by Andrew Score of 8

Is packet radio possible on Baofeng UV-5R and similar HTs?

I am curious to know if it is possible to do packet radio on VHF/UHF using the UV-5R... I have seen some invasive hardware hacks, but without modifying the radio itself (firmware, hardware) it's my ...

vhf uhf packet audio-interface  
user avatar asked by user400344 Score of 17
user avatar answered by user400344 Score of 3

Calculating Doppler Shift for satellites

If I know how fast a satellite is moving through space, how can I calculate the doppler shift for the pass?

satellites doppler  
user avatar asked by Skyler 440 Score of 10
user avatar answered by Joao Encarnacao Score of 7

How can I avoid accidentally transmitting with a Baofeng UV-5R?

I don't have $500 for a radio scanner. If I know the few (analog) frequencies that I would like to listen to, I think one can use the Baofeng UV5R (which doesn't cost much). The only problem is that ...

receiver baofeng  
user avatar asked by user4777 Score of 27
user avatar answered by Chris Score of 26

What makes a 5/8 wavelength vertical desirable?

An ordinary 1/4 wavelength vertical is smaller and resonant without any loading coil or matching network. What's the advantage to a 5/8 wavelength vertical? Why 5/8 in particular, and not something ...

antenna vertical-antenna  
user avatar asked by Phil Frost - W8II Score of 23
user avatar answered by WPrecht Score of 27
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