The world's smallest HF Transmitter

Keychain QRP is a micro-sized CW (morse code) transmitter. It is available in 3 different Amateur Radio HF bands as well as 2 AM/FM broadcast frequencies.

These tiny rigs are a great lightweight and cost effective addition to your various emergency/survival kits, as well as bug out bags. Keep one attached to every set of car keys, and rest assured that you will always have an emergency HF transmitter in your pocket everywhere you go.

Add some on-the-air realism to your next ham club morse code practice session, and ditch that silly code practice oscillator. Remember, real hams practice on the air.

Having trouble getting your family, friends, or local Boy Scout Troop interested in ham radio? Get them hooked on the fun of sending morse code back and fourth with the AM/FM license-free versions of the Keychain QRP transmitters to peak their interest in studying for their Ham test.

Keychain QRP transmitters are nearly bullet proof when it comes to reflected RF from a poorly matched antenna wire. You can even accidentally transmit without an antenna connected with little to no risk of damaging the transmitter. So, feel free to use several feet of scrap wire to practice sending code to your buddy across the room or even across town with a base loaded telescopic HF whip from MFJ.

If you want to get serious with your Keychain QRP, just add a simple low pass filter, then hook it up to a properly tuned full size dipole, end-fed, NVIS, or beam antenna. You might be lucky enough to make a contact up to a few hundred miles away if the conditions are right. Also, be sure to properly ground your Keychain QRP for best performance.

When paired with an inexpensive multi-band shortwave receiver, a very effective transceiver setup can be achieved. (Remember: Many dual band VHF/UHF handheld ham radios have a built-in wide band receive mode that typically covers AM/FM/shortwave broadcast as well as HF ham bands.

Keychain QRP is the world’s smallest HF Ham Radio CW transmitter available for sale, and they are proudly handmade in The United States of America.

Available frequencies:

10m ham band: 28.224 MHz – Any Ham license
80m ham band: 3.57954 MHz – Any Ham license
160m ham band: 1.8432 MHz – General class or higher license required

FM broadcast band: 100.000 MHz – No license required
AM broadcast band: 614.400 KHz – No license required

Typical Power Output: 160 milliwatts max with 9v battery
Antenna Connector: SMA female 50 ohm

Built-in LED indicator to verify your battery is still good and that you are indeed transmitting when you key the transmitter.

The following frequencies are also available upon special request:

160m band: 1.850MHz
80m band: 3.6864 MHz
20m band: 14.31818 MHz
15m band: 21.168 MHz
15m band: 21.200 MHz
10m band: 28.3046 MHz
10m band: 28.322 MHz
10m band: 28.636 MHz
6m band: 50.000 MHz
6m band: 50.350 MHz
6m band: 51.840 MHz
6m band: 53.248 MHz