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A prebuilt Softrock-like HF SDR. Looks like it's mostly SMT.
to electronics hf radio sdr ... on 18 April 2011
Interesting bits on building amplifiers, and how to properly maintain crank-up antenna towers (it's remarkably complicated).
to amateur amp electronics hf mechanica radio retrotech rf ... on 11 April 2011
Why high SWR and feedline radiation isn't necessarily a bad thing (because it doesn't actually cause much loss in practice, and it lets you tune the antenna from the transmitter end).
Audio-only, but a good overview of commercial stuff.
Converting CB radios for use on various amateur bands (not just 10m -- he walks through a conversion for 4m!).
to amateur cb electronics hf radio vhf ... on 23 January 2011
30 watt IRF510 Power Amplifier for five HF bands, by ON6MU
30W with a single IRF510 (and otherwise all bits I have in store, I think).
to amplifier electronics hf linear radio ... on 11 January 2011
I'd forgotten about this kit -- or, rather, not realised how easy it is to drive from something other than the HPSDR hardware. Hohum.
Cheap portable HF antennas (notably the D-Original Outback 1899/2000).
VOACAP Quick Guide: HF Propagation Prediction and Ionospheric Communications Analysis
The Google Maps-based predictor is pretty cute: it'll give you a nice chart showing which frequencies should work well between two points throughout the day.
to hf propagation radio ... on 04 November 2010
Pirate beacons. Obviously.
« earlier | later » Page 3 of 5
| - hf | |
| 11 | aerial |
| 1 | am |
| 17 | amateur |
| 2 | amp |
| 4 | amplifier |
| 1 | analyser |
| 8 | antenna |
| 1 | balun |
| 2 | beacon |
| 2 | broadcast |
| 4 | cb |
| 1 | codec2 |
| 1 | coil |
| 2 | digimodes |
| 1 | dipole |
| 1 | dv |
| 8 | eh |
| 18 | electronics |
| 1 | filter |
| 6 | ham |
| 44 | hf |
| 1 | inductor |
| 5 | isotron |
| 2 | linear |
| 2 | lpf |
| 1 | mechanica |
| 1 | mf |
| 1 | microcontroller |
| 3 | microvert |
| 1 | mixer |
| 1 | modelling |
| 1 | obviously |
| 1 | packet |
| 3 | pirate |
| 1 | propagation |
| 1 | psk |
| 1 | qrp |
| 43 | radio |
| 2 | receiver |
| 1 | regen |
| 1 | retrotech |
| 1 | review |
| 3 | rf |
| 4 | sdr |
| 1 | shopping |
| 5 | shortwave |
| 11 | small-aerial |
| 1 | spice |
| 1 | ssb |
| 3 | swl |
| 1 | test-equipment |
| 1 | transceiver |
| 1 | transmitter |
| 1 | uhf |
| 1 | valve |
| 5 | vhf |
| 1 | windom |
tasty by Adam Sampson.