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1500 questions
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1 answer

Can club stations register callsigns on the D-Star network?

Some of the members at my local radio club are interested in working with D-Star. Since the equipment is very expensive, it was proposed that the club purchase and operate one rig collectively. Is there any precedent for registering a club station's…
mtrberzi
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Is there anything special about 4.9152 MHz intermediate frequency?

I noticed that there are several QRP transceivers that use 4.9152 MHz intermediate frequency. For instance, John Dillon, WA3RNC uses it in Penntek TR-25, TR-35 and TR-45 transceivers. Also a very close frequency (4.914 MHz) is used in Elecraft…
Aleksander Alekseev - R2AUK
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5 answers

Wifi passive repeater (antenna to antenna connection)

I have two buildings. Building A has wifi (2.4GHz) infrastructure, Building B doesn't. One side of building B can pick up the wifi signal from building A. I want to passively extend the signal through to the rest of building B, using two antennas…
askvictor
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2 answers

What will the *amplitudes* of mixer products be?

The key fact about mixers, which iirc is even part of the FCC amateur radio exam(s) in the USA, is that they output "the sum and difference" of the input frequencies. And iiuc in practice it's usually assumed that besides those products the mixer…
natevw - AF7TB
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8
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2 answers

New operator struggling to make a contact

I got licensed a couple of weeks ago and after making 4 attempts on different days, I have made no contacts on SSB, only FT8. What I have (done): Xiegu x6100; tried 5W and 10W Par EndFedz® EFT-10/20/40 Trail Friendly antenna Antenna deployed as a…
Amanda Helgström
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1 answer

Why is 9 kHz the lowest frequency for spectrum analyzers?

I researched a number of spectrum analyzers and it seems that the lowest frequency that these operate at is 9 kHz. Why is the lowest frequency supported by spectrum analyzers 9 kHz?
kittygirl
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Yaesu VX-7R clock is running very fast

I just noticed the clock on my Yaesu VX-7R is running very fast. I noticed this a few days ago, where it would be days ahead. I would reset the time to the second and then, again, hours or days ahead. I'm not sure when this started happening, or if…
user21417
8
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7 answers

Why is 20m band waterfall showing signals every 50 kHz?

I'm very new to shortwave listening and just got to grips with my RTL SDR HF dongle. Last night while on the 20m band, there were signals exactly every 50kHz, starting exactly at 14.000MHz, then at 14.050 MHz, 14.100 Mhz and so on. Google said they…
rcx935
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6 answers

Learning morse, but I can't write fast enough?

EDIT below with collected thoughts so far... I've been learning morse lately, and thought I was doing tolerably well until I learned that doing this at 5 wpm/15 Farnsworth, is evidently considered essentially pointless. So, now I'm trying at 20 wpm,…
Toby Eggitt
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How long should I wait to claim a frequency?

Let's say you want to go on air and you don't want to invade on someone else's frequency. How does one make sure the frequency isn't occupied before claiming it. And how long should you take to make sure the frequency isn't occupied before starting.
Ben Madison KO4UXC
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2 answers

How to reduce VFO sensitivity to the hand capacitance?

I got a little tired of Si5351 and decided to build an analog CW transceiver. It's almost done and works pretty well. However, I discovered one problem. When I reach the VFO control with my hand the frequency shifts a little, about 100 Hz or so.…
Aleksander Alekseev - R2AUK
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8
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4 answers

Tuner at antenna side versus transmitter?

I figure the transmitter has a 50-ohm pure resistive output and that the transmission line is 50-ohm as well. I think it's usually the antenna itself that actually needs to be tuned, yet it sounds like everyone places the tuner at the transmitter…
pgibbons
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3 answers

Why don't I hear the CTCSS tones when listening on the repeater input frequency?

I am newly licensed (Technician) and bought a UV-5RA as a cheap way to check out what's going on in my area and see if I'm finding it interesting enough to get a better UHF/VHF HT. The other day I was listening to a conversation happening on a local…
QuantumMechanic
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1 answer

S Parameters in HFSS

I'm new to HFSS Software and I'm trying to plot Scattering parameters for a dielectric resonator excited by a probe (shown in image). I know that the top cylinder has a higher dielectric than the bottom cylinder. I also know that the cavity is a…
JOHN
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4 answers

Is there a "proper" phonetic alphabet to use with voice communications?

When I took my Technician test some 20 years or so ago, we had to memorize the phonetic alphabet, which I think is the same one used in the military. I was taught that it was international, similar to morse code. It used words such as "Mike" for the…
ghendricks
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