Oct 4, 2009 Homemade
Homebrew measuring, control devices, instruments and RF spectrum analyzers by radio amateurs.
Keywords: homebrew, homemade, amateur radio, ham radio, control, device, RF, spectrum analyzer.
Measuring and control devices
RF Signal Generator
This signal generator is intended for realignment of radio receivers. The unit is cheap and fairly basic, but perfectly adequate for its intended purpose. However, the output is not a pure sine wave, so the unit may not be suited for more exacting electronic development work.
TR1 is a high gain FET (Field Effect Transistor) and is configured as a Colpitts style oscillator. The oscillation frequency is set by the variable capacitor (C1+C2) and the five pairs of switched inductors. There is significant overlap between the ranges, due to the limited range of readily available inductors. However even by using specially would inductors, four frequency bands would have been needed to cover the range.
Tags: Ham radio
Oct 3, 2009 Ham radio
Ham radio electronic kits
Ham radio links related to kit building projects. Many ham radio operators enjoy building transceivers, tuners, keyers, and other kits and homebrew projects.
- K12 Keyer IC and Kit – The K12 replaces the very popular K10 and K10+ keyers which have been shipping for almost ten years now.
- K10+ Keyer IC – The K10+ is a Morse keyer I.C. with lots of built in features only found in high end keyer I.C.s.
- K-ID and K-ID2 – This chip is designed expressly for dedicated beacon or CW identifier applications. It is very flexible and has the advantage of a very large message storage bank (512 bytes) which is non-volatile.
Tags: Ham radio
Oct 1, 2009 Ham radio
HamSphere 2.0 beta should be release today.
Kelly Lindman announced on his website that we’ve to wait some more days to get the latest HamSphere 2.0
Hamsphere virtual transceiver features going to be:
- Brand new appealing Radio skin with true VFO.
- Multiple skin options. Currently two skins available. (See Bill Walch HS 2.0 version here)
- Improved DX cluster
- Simulation on/off switch
- Improved warning system / Ban / Kick
- Dual filters
- Memory channel / VFO operation
- Fast direct frequency to band setting.
- Realistic VFO with 10 hz resolution.
- Progressive VFO for fast and reliable tuning.
- Fully implemented jitter buffer to minimize audio latency. Can be switched off for fully reliable audio stream.
- TCP protocol transport. Will work through most firewalls (unless it’s blocking outbound traffic)
- Single channel NAT-friendly TCP/IP operation.
- All HAM bands included: 10, 15, 20, 40, 80, 160, WARC bands + BC band.
- Better audio compressor.
- Better audio bandwidth (up to 4 kHz).
- 32kbit audio codecs (Application will require 32kbit up and down stream).
- Fully realistic analogue S-meter with dB scale.
- Instant band shifting
- Improved bandscope.
- Improved Ionospheric simulation.
- Same modulation technique as before. Hamsphere uses Digital Local Oscillators and true DSB modulation.
- Limited tranceiver for guests (Limited band, power and filters)
- Subscribers enjoy; DxCluster, Full power, unlimited bands, audio codecs, noise free bands if needed.
- Subscriptions only for real hams and serious “11 meter DX ers” that have to pass a test and a user agreement.
- Broadcast band for broadcast people. Will not interfere with QSO bands.
- Robots will be on demo and DX bands only. No QRM on rag chew bands.
Tags: Ham radio