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Antenna for 6M, or Antenna system?
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1 votes

Yes, a dipole for 50 MHz is most definitely possible. Your 6 meter band is 52 ± 2 MHz. 2/52 is just over 0.038. This is the frequency variance involved: how much, in terms of a center frequency, does ...

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Radio wont RX or TX on repeaters. Fine in simplex
3 votes

Since you say that both radios have the exact same problem, I think we can more or less rule out an outright problem with the radio itself. Since you say that you used to be able to hit this repeater ...

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In SSB how do receivers calculate the frequency offset without a carrier?
0 votes

Like Kevin already wrote, the receiver doesn't "auto-tune" in SSB. In fact, I think the only modes in which there is an appreciable amount of "auto-tuning" or allowance for being significantly off ...

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What are the dos and don'ts when it comes to retractable antennae for HTs?
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3 votes

The biggest do is to follow the manufacturer's instructions. I can't immediately locate any sort of instruction sheet for this particular antenna, but given that using it is slightly more involved ...

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Receiving without configuring CTCSS
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4 votes

Your understanding of tone squelch is wrong. Tone squelch is simply an extension to the squelch system. Normally, the squelch opens whenever the received signal is stronger than the squelch threshold....

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What transfer rates are actually achievable using known digital modes?
6 votes

You are looking for the Shannon-Hartley theorem. Borrowing Wikipedia's summary, because it's better than what I can come up with: In information theory, the Shannon–Hartley theorem tells the ...

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Why are Amateur Radio operators so obsessed about and hostile towards violation of the rules?
8 votes

As has been mentioned, many radio amateurs tend to be in the types of fields where various forms of rules are the name of the game. Electricity always behaves the same. So does a computer (assuming it ...

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What is a general procedure for aligning directional antennas?
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4 votes

Use a map and a compass. Really. It doesn't have to be more involved than that. As long as we are talking about line of sight propagation, that should be close enough to get you well within the ...

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After I call out "Monitering" how long should I wait until I switch frequency?
5 votes

This would depend on local practice. Generally speaking, I'd wait at least for the repeater's sign-off notification (or carrier drop-out if it has a long output carrier hold), then preferably a ...

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What is a CQ contest and what is the proper way to respond to a CQ contest call?
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7 votes

A "CQ Contest" is simply a limited CQ, just like someone can call CQ some-specific-area or CQ any-member-of-a-particular-club. I don't think I've heard this variant on SSB, but I imagine in some ...

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What makes JT65 preferable for VHF, and JT9 for HF
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1 votes

According to Wikipedia, JT65 uses 65-tone MFSK (Multiple Frequency-Shift Keying), whereas JT9 uses 9-tone FSK (Frequency-Shift Keying); probably hence the numerals in the respective names. By only ...

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Do signals have to be more separated on higher frequencies?
2 votes

In principle? No. Now, on the wider bands, wider transmission modes are often used as well. 28 MHz, for example, is the only HF band that has allocations in the band plan for FM. Early on, a common ...

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What is the process of making a voice contact?
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11 votes

First off, amateur radio isn't very strict. With few exceptions, nobody is going to be very upset if you miss out on something during a casual contact. If you mess up too badly, you'll be asked to ...

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What's wrong with 220MHz?
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15 votes

While for an authoritative answer to this I believe you'd have to ask the manufacturers directly (unless we happen to have someone here on the site who works for one of them), there is a pretty big ...

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What is the point of a SWR/power meter where the needles cross over each other?
6 votes

A properly calibrated cross-needle power meter such as e.g. the MFJ-842 actually tells you something more than just the forward and reflected power, which as you point out can just as easily be ...

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What does a SSB frequency actually indicate?
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13 votes

Normally in amateur radio when specifying a frequency you specify the nominal carrier frequency. For SSB and other suppressed-carrier transmission modes, you specify the frequency to which the BFO ...

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Why do some antennas list modulation type alongside power rating?
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7 votes

It's about transmission duty cycles. For example, FM has a very high duty cycle during transmission: the transmitter's output power is constantly at 100% regardless of the amount of modulation. AM ...

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If I hear a distress call, what is the correct procedure for helping the person?
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22 votes

First, if you hear a distress call: STOP! Immediately end any transmission in progress. Do not touch any antenna or radio controls except as needed to turn off split operation etc. Lock the VFO to ...

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Is a guest-operator QSO recorded in the host-station log too?
3 votes

In Sweden, there is no requirement that any logs be kept; keeping a station log is purely voluntary, and I know that many don't, particularly for mobile or repeater QSOs. The only really relevant ...

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Why do I need to tune an antenna?
Accepted answer
13 votes

There are two different parts to antenna tuning: transmission line impedance matching and resonance. The antenna is at resonance when it presents a purely resistive load to the transmitter. That is, ...

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What is a waterfall display?
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14 votes

A waterfall display is a graphical representation of the signals across a frequency range, generally color-coded to indicate signal amplitude or strength, displayed over time. image source: ARRL and ...

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How do emergency nets work?
12 votes

If the power grid and cell phones when down while I was a few hundred miles from home what would be the best way to get a message to my family if my home and I both had access to a radio and small ...

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How to talk to the ISS
6 votes

According to the ISS Fan Club's Frequencies page, for FM voice transmissions the downlink (your listening) frequency is 145.800 MHz and the uplink (your transmission) frequency is 144.490 MHz, when ...

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Handheld Dipoles
2 votes

There is one major reason why what you are suggesting isn't done, and it isn't the size of a two-part dipole versus a single (possibly shortened) quarter-wave utilizing the radio and operator as a ...

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What would propagation look like on Mars?
8 votes

According to NASA TP 2000 209756, particularly section 2.5, it shouldn't be too different from similar propagation on Earth during daytime, except we'd need significantly lower frequencies than we are ...

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What is a link budget, and how do I make one?
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35 votes

A link budget is a summary of a communications link that tries to take into account all factors which have an impact on the received signal strength. It is often used to determine the minimum amount ...

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What is the relationship between SWR and receive performance?
Accepted answer
19 votes

If an antenna analyzer shows 1:1, does that mean it's an ideal receiver as well? No. Assuming we're talking about a characteristic impedance of 50 ohms, a 50 ohm resistor (otherwise known as a dummy ...

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Does mixed-mode operation qualify as a QSO?
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12 votes

Does mixed-mode operation qualify as a QSO? I'd say absolutely, yes. You're making contact with another amateur radio station on a frequency allocated to amateur radio; in my book, that qualifies as ...

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What do the three-letter modulation codes (emission designators) stand for?
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16 votes

The emission type specifier is made up of several fields, which are defined as follows. First comes an (optional) specifier of the necessary radio bandwidth. This is four characters, mixed letters ...

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Are there well-known methods that can help improve my CW copying speed?
29 votes

The Koch method is supposed to be very good at building fast Morse code receiving skills. The basic idea is that you start out by setting up to receive code sent at your desired target speed, usually ...

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