Newest Questions
4,999 questions
4
votes
3
answers
167
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Does a transceiver radio have a "receiving range"?
I'm familiar with the fact that a transceiver radio has an effective transmission range that is affected by several factors, such as the antenna, transmit power, obstacles, etc. I'm wondering if a ...
0
votes
2
answers
62
views
Midland G7 Pro charging voltage (Ni-MH battery)
I've found contradictory information about the voltage and current fed by the original charger (using a PB/ATL-G7 Ni-MH battery), and I'm trying to use a generic one through its mini-jack port, ...
- 133
1
vote
3
answers
108
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does "CW signals" still mean the same since 1960s vs. today?
I think my 1964 my CW transmitter was just an on-off carrier. I think today's CW is a modulated sideband with no carrier. (This makes tuning today's CW signal non-intuitive to my old paradigm.)
- 21
0
votes
2
answers
84
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Extending the range of PMR446 power-limited equipment
I'm looking for workarounds that may be well-known by the community, to extend the range of units such as Midland G7 Pro, which operates in the PMR446 band and is also limited in power by this ...
- 133
0
votes
1
answer
48
views
Output from Constellation Modulator different from Demodulator output
I'm just comparing the IQ plots from the output of a QPSK Constellation Modulator and comparing to what I get on the reciever end via the Costas Loop output. Note that data transmission is working ...
3
votes
2
answers
163
views
3 ferrite rod antennas in close proximity
I want to control a trio of radio controlled clocks. DCF77 (77.5kHz), JJY (40kHz), and WWVB (60kHz). Suitable signals can be generated with a microcontroller or Raspberry Pi. I will use ferrite rod ...
- 159
0
votes
1
answer
82
views
Poor SWR on short coax line
I have build an antenna for 446mhz I have used 15mm copper tube for the dipoles and RG-58 for the coax. On the horizontal centre line I have created a coil 9 turns around a 25mm former. The feed line ...
-1
votes
2
answers
249
views
Balancing Currents in Coaxial Cable
The basis for the two questions that follow, is that I have always been dissatisfied with the reasons given for the cause of the balancing currents in a coax cable, since as far as I could tell, ...
- 1,002
2
votes
2
answers
245
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Prudent power limits for SSTV on my Yaesu FT-710
I recently added a Yaesu FT-710 to my setup. I do some FT-8, and I found guidance from Yaesu posted online that said that 50 watts is an appropriate power level for FT-8 on this radio, but that more ...
- 177
3
votes
1
answer
141
views
Repeating signal every 0.185 MHz on 1400 MHz region
So I’m analyzing the spectrum from my RTL-SDR setup and noticed a periodic feature repeating approximately every 0.185 MHz. I don’t use any LNA, just a simple RTL-SDR dongle and a Wi-Fi grid antenna. ...
-1
votes
1
answer
88
views
How can I get any reception from my new baofeng?
I have a new out the box baofeng AR 5RM. I also have three different antennas. The original "rubber duck" antenna, an abbree ar 895s VHF uhf and an abbree ar 771 VHF uhf antenna. No matter ...
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0
votes
1
answer
95
views
How long do I have to wait before I get a letter from the fcc about my callsign?
How long do I have to wait because, I just paid and am waiting.
4
votes
4
answers
1k
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Is there really a shielding of low-level audio frequency signals (e.g. for microphones) in the factory-made cables with (plastic) RJ45 connectors?
There are several schematics that show, for example, a MIC signal line in a 6- or 8-conductor ribbon cable for crimped RJ45 connectors that is marked as shielded. The shield is shown as the adjacent ...
- 173
0
votes
1
answer
77
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Constructing a dual whip dipole antenna
I am wanting to put two 20-meter 17' telescopic whip antennas on a dual 3-way mirror mount, one to one side of the mirror mount and the other one in the opposite direction on the mirror mount.
Should ...
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-1
votes
1
answer
151
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does lease restricting "ham radio" apply to "amateur radio" legally?
the legal language of my lease uses the term 'ham radio' (a colloquial term) prohibiting 'installing' it. would this legally prohibit my 'amateur radio' (FCC term)?
is my HT 'installed' as it rests on ...
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