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1500 questions
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2 answers

How much attenuation (dB) from a balun is expected?

I'm building a dipole antenna for 433 MHz, first one ever. I will have to use a ferrite bead to balance the feed. How many decibels of attenuation should I expect from the ferrite bead?
AllYourBaseAreBelongToUs
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FT8 etiquette when no reply after responding to CQ?

When you respond to an FT8 CQ and the other side doesn't respond after a couple of your transmissions, what is proper etiquette? (Assuming you're working split and not transmitting on his receive frequency.) Should you keep transmitting so he knows…
QuantumMechanic
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Simple AM receiver with gnuradio / RTL-SDR

EDIT: I have succeeded in getting the AM receiver to work, by replacing the AM Demod block with a Complex To Mag, and a Band Pass filter (this is noted as an alternative in the AM Demod docs). Consequently, while I've proved that most of what I did…
Toby Eggitt
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Replacing hand-wound inductors with store-bought versions

I'm wading through some schematics for a direct conversion I-Q SDR receiver, and there is an L-C band-pass filter on the input. Each inductor is specified by an inductance, a toroidal core material, a wire gauge (AWG), and a number of turns. I…
W5VO
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Does an SWR higher than 1:1 necessarily cause additional heat in the transmitter?

Each of the 3 answers to SWR of 1.5 -- use internal antenna tuner or not? in one way or another suggest that an SWR of 1.5:1 will cause additional heat in the transmitter: The radio may heat up a bit more during transmit with a 1.5:1 SWR, however i…
Phil Frost - W8II
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When is a balun a Guanella?

I've searched this site, wikipedia, other sites, and haven't found a clear answer: What features or parameters of a balun or choke put it into the category/definition of a "Guanella"? Where does the name come from?
Jay Rabe - KJ7TTT
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Operating on foreign US soil

Some places, like embassies and military bases, are considered US soil, even if not traditional. Can one operate with a US call sign in such situations, and how should it be done?
PearsonArtPhoto
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Using standard headphones with the Yaesu FT-60?

I just got a Yaesu FT-60R handheld, along with the MH-37A4B earpiece. After having it around for a couple days, I think I'd like to be able to connect standard headphones to it, so as to be able to listen privately without carrying around an extra…
Kevin Reid AG6YO
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Does the waveform of the VFO necessarily have to be sinusoidal?

Looking around for a VFO online, I see most kits/manufacturers make it a point to mention the waveform. Sinusoidal is a fundamental shape, whereas others (sawtooth, square) are a composite. I recall reading online (can't remember where it was) that…
VU2NHW
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Where can one get a "listed" SO-239 lightning arrester?

According to this summary of NEC requirements for radio antenna grounding (from 2014, but hopefully still somewhat accurate): https://www.mikeholt.com/files/PDF/Radio_and_Television_2014NEC.pdf It says "Antenna lead-in surge protectors must be…
User5754448
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What exactly is field day, and do I need equipment?

I have been a ham not quite long enough to experience field day. I have been excited for the weekend ever since I heard about it. I looked at the ARRL site for field days in my location, and found a few I could visit. I currently don't have HF…
Skyler 440
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Grounding a vertical antenna from a balcony

I have a multiband vertical antenna mounted onto the railings of my balcony apartment high up on the 6th floor of an apartment building. The antenna is not grounded. This antenna comes without radials. I can see at the side of my building, a ground…
Engineer999
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4 answers

Weather-proofing antenna connections

Here's a problem: you buy a fancy new vertical for a fair bit of coin, but there's no coax connector on the thing. There are just screw terminals. You need to attach coax to it, but in such a way that the coax termination is protected from the…
Phil Frost - W8II
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Romanian amateur radio license

Romanian amateur radio license Hello. I am wondering how to get a amateur license in Romania, and whether there is any material on this. I am licensed in the US, am a Romanian citizen, and can speak Romanian, so that should not be a problem. I did a…
smarnav
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What rig or rigs are onboard the ISS?

This article mentions the Ham Shack aboard the ISS. From the picture it looks like a small very light rig like a Yaesu FT-817. What radio(s) do the astronauts use when they talk to Hams and School-age kids (with help from licensed hams) on earth?
Warren VE3WPX
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