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Questions tagged [band-plan]

A voluntary, not regulated, division of an amateur radio band into sections for specific modes or types of operation.

0
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1answer
101 views

Why do the metres seem to be increasing with frequency?

I went to the ARRL's band plan site at https://clatsopauxcomm.org/index.php/technical/arrl-band-plan, and the first table began with the 60-metre band, which starts at 1.8MHz and ends at 2.0MHz. ...
1
vote
1answer
152 views

Is there a DV VHF calling frequency in the UK?

On the band plan for VHF for the UK, I can see 145.500MHz being the FM calling frequency but I cannot find any for DV. Is there one? In contrast, for UHF, I can see a calling frequency for FM at 433....
6
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3answers
663 views

How slow is slow telegraphy?

On the UK Band Plan there are frequencies stating “QRS (slow telegraphy) Centre of Activity”. For example, 14,055 kHz on 20m and 3,555 kHz on 80m. What is considered slow? (<15 wpm?) How close ...
6
votes
2answers
422 views

What “test transmissions” are allowed above 51MHz?

The ARRL's band plan chart includes the following text in its legend: Test transmissions are authorized above 51 MHz, except for 219-220 MHz What FCC regulation is this referring to? Aren't all ...
4
votes
2answers
233 views

Experiences on a 70 cm band shared with radiolocation service

I currently live in Brazil and our governmental regulatory agency (www.anatel.gov.br) has recently started a public consultation process regarding the allocation, in secondary nature, of part of the ...
2
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3answers
4k views

How does the antenna length affect signal transmission/receipt in different bands?

My Canadian Amateur Radio Basic Qualification Study Guide tells me that my antenna length is specific to the wavelength I wish to broadcast on and gives a formula that equates to antenna length = half ...
7
votes
3answers
18k views

How can you calculate the frequencies for each band?

I've just started studying for my HAM license a couple of weeks ago, so please excuse me if this is a remedial question... I have the Canadian Amateur Radio Basic Qualification Study Guide (which I'm ...
7
votes
2answers
852 views

What is a fixed digital message forwarding system?

What is a fixed digital message forwarding system? I noticed this on the lower end of the 222MHz allocation in the US but it's not explained on the band chart:
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2answers
1k views

Choosing simplex frequency as a technician

My brother and I just got our technician class license. We live close enough to each other that we can use simplex on 2 meters or 440. How do we go about choosing the best frequency to use?
3
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2answers
193 views

Which frequencies in a band should I use for antenna and radio testing?

Are there any frequencies (HF, 2m and 440) that are more suitable than others (assuming all are within those licensed to the operator) for testing new radios and/or antennas? I assume that one should ...
30
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4answers
23k views

What's the difference between national calling frequency and national simplex calling frequency in the 2m and 70cm band plans published by ARRL?

On the 2 meter and 70 centimeter band plans published by the ARRL, what is the difference in intended use between the calling frequencies (144.200, 432.10 MHz) and the simplex calling frequencies (146....
4
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2answers
1k views

Best QRP HF band for small antenna?

What HF bands, times of day and/or conditions might be best for attempting to make non-local contacts using QRP transmitter power (around 1 Watt) and a small indoor folded or loop antenna?
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3answers
2k views

I hate contests. How can I avoid them?

There's nothing worse to getting home, turning on the radio, and being unable to find a clear frequency that isn't full of a bunch of meaningless QSOs where somehow everyone is 599 and no one has ...
6
votes
2answers
405 views

Can I transmit on 2 frequencies simultaneously?

Lets say I want to call out CQ on 145.340, 145.940, and 146.140 at the same time, am I allowed to call simultaneously on all three then monitor all three for replies?
7
votes
1answer
287 views

Why do USA transceivers limit transmit to 430-450MHz?

The FCC table of frequency allocations clearly states on page 27 that the Amateur allocation for 70cm is 420-450MHz, but I've seen a lot of transceivers that limit transmit to 430-450MHz. Why is this?...
8
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2answers
2k views

HF Digital Mode Band Plan for the USA

I recently started playing with the digital modes, but have been frustrated with the difficulty in finding where certain modes are commonly used. Is there a digital mode band plan for the HF bands, to ...