3 ms·

> Surprisingly, this amplifier only produced 20 watts of power, not much more than a handheld walkie-talkie. Humm I thought actual radio power of walkie-talkie

> Surprisingly, this amplifier only produced 20 watts of power, not much more than a handheld walkie-talkie. Humm I thought actual radio power of walkie-talkies were in the mW range (for regulation and power consumption reasons). But yes, 20W of radio power is not little (actually it is a lot)

kens 5y ago
Walkie-talkies are mostly .5 to 5 watts, but you can get ones with 20 to 40 watts. I'm not sure how legal those are.
- Stratoscope 5y ago
  If you're in the US and have an Amateur license, you can generally transmit with up to 1500 watts PEP (Peak Envelope Power). Some lower limits apply; for example a Technician licensee is limited to 200 watts in the HF bands, but may use the full 1500 watts in most VHF/UHF bands. There is no legal distinction between a handheld and any other kind of transmitter. A transmitter is a transmitter. There is a legal requirement to use the minimum power needed to carry out the desired communications, so you should not blast out 1500 watts at all times. Especially not next to your head! http://www.arrl.org/frequency-allocations http://www.arrl.org/frequency-allocations
- kawfey 5y ago
  Whether or not they're legal, they're a bad idea to use next to your head.
  - Cerium 5y ago
    Higher power handheld transceivers usually feature a corded microphone to allow increased distance between your head and the antenna.
tyingq 5y ago
Here's a traveling wave tube amp that does 5 kilowatts: https://www.arworld.us/post/5700TP12G18.pdf?44385.7040046296 https://www.arworld.us/post/5700TP12G18.pdf?44385.7040046296
- madengr 5y ago
  The tube on the cover of this book is 1 MW at 90 GHz. https://www.amazon.com/Tube-Guys-Norman-H-Pond/dp/0981692303 https://www.amazon.com/Tube-Guys-Norman-H-Pond/dp/0981692303 It's for an airborne ADS (i.e. pain ray). Good book if you want the detailed history of microwave tubes.

kens 5y ago

Walkie-talkies are mostly .5 to 5 watts, but you can get ones with 20 to 40 watts. I'm not sure how legal those are.

Stratoscope 5y ago
If you're in the US and have an Amateur license, you can generally transmit with up to 1500 watts PEP (Peak Envelope Power). Some lower limits apply; for example a Technician licensee is limited to 200 watts in the HF bands, but may use the full 1500 watts in most VHF/UHF bands. There is no legal distinction between a handheld and any other kind of transmitter. A transmitter is a transmitter. There is a legal requirement to use the minimum power needed to carry out the desired communications, so you should not blast out 1500 watts at all times. Especially not next to your head! http://www.arrl.org/frequency-allocations http://www.arrl.org/frequency-allocations
kawfey 5y ago
Whether or not they're legal, they're a bad idea to use next to your head.
- Cerium 5y ago
  Higher power handheld transceivers usually feature a corded microphone to allow increased distance between your head and the antenna.

tyingq 5y ago

Here's a traveling wave tube amp that does 5 kilowatts: https://www.arworld.us/post/5700TP12G18.pdf?44385.7040046296 https://www.arworld.us/post/5700TP12G18.pdf?44385.7040046296

madengr 5y ago
The tube on the cover of this book is 1 MW at 90 GHz. https://www.amazon.com/Tube-Guys-Norman-H-Pond/dp/0981692303 https://www.amazon.com/Tube-Guys-Norman-H-Pond/dp/0981692303 It's for an airborne ADS (i.e. pain ray). Good book if you want the detailed history of microwave tubes.