Adam Sampson's ham bookmarkshttps://bookmarks.offog.org/ats/hamAdam Sampson2017-12-10T15:17:15ZuBITX -A compact HF transceiverhttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fwww.phonestack.com%2Ffarhan%2Fubitx%2Fubitx.html2017-12-10T15:17:15ZApplying the BITX philosophy (good performance out of absurdly cheap parts) to a multiband SSB radio. The trick here is using an Si oscillator chip that can provide three separate outputs -- so you can do things like switching sidebands by tweaking one oscillator either side of the final filter frequency. Very neat!Projectshttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fwww.icengineering.com%2Fn3ic%2Fprojects%2F2016-08-28T11:41:26ZHuge collection of the author's electronics projects, mostly from the 60s-80s, including a series of small telephone switches.JamesP6000/WsprryPi: Raspberry Pi WSPR transmitter using NTP based frequency calibrationhttps://bookmarks.offog.org/edit?url=https%3A%2F%2Fgithub.com%2FJamesP6000%2FWsprryPi2016-03-19T17:49:52Z"Raspberry Pi WSPR transmitter using NTP based frequency calibration."Homepage of Uuki OH2GVBhttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fuuki.kapsi.fi%2F2015-11-15T17:30:49ZSome useful notes on the Baofeng/Wouxun cheapie handhelds, but the rest of this is also quite interesting, particularly the repairs to test equipment. (I need to keep an eye out for one of those HP spectrum analysers...)The Sproutie MK II HF Regen Receiver | Dave Richards AA7EEhttps://bookmarks.offog.org/edit?url=https%3A%2F%2Faa7ee.wordpress.com%2F2015%2F09%2F14%2Fthe-sproutie-mk-ii-hf-regen-receiver%2F2015-09-23T21:25:19ZA very impressive shortwave receiver, using an HRO-style tuning control, a regenerative frontend and a load of multistage audio filters.Amplitude Demodulating BPSK31 | Analog Zoohttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fwww.analogzoo.com%2F2014%2F12%2Famplitude-demodulating-bpsk31%2F2015-01-03T17:28:24ZSince PSK31 is both phase- and amplitude-modulated, you can completely ignore the phase modulation and just envelope-detect it!My Hobbies: Met Balloon Hunting | RF Head – HAB & Ham Radio Experimentationhttps://bookmarks.offog.org/edit?url=http%3A%2F%2Frfhead.net%2F%3Fp%3D422014-05-28T16:15:25Z"Every 6 hours (0,6,12,18 UTC), the Bureau of Meteorology (the BOM), launch a weather balloon. Where they land depends on mainly on atmospheric wind conditions at the time of launch. Some days, I'm out chasing them."mcHF QRP transceiver | Small and inexpensive homebrew HF radiohttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fwww.m0nka.co.uk%2F2014-05-25T22:54:59ZUsing SDR techniques but in a conventional integrated-radio form factor.FreeDV | HomePagehttps://bookmarks.offog.org/edit?url=http%3A%2F%2Ffreedv.org%2F2013-02-11T23:30:53ZDigital voice mode based on codec2. Must have a play with this at some point, although I think the chances of me hearing anything are slim...W2UW FET-1https://bookmarks.offog.org/edit?url=http%3A%2F%2Fwww.qsl.net%2Fvqs%2Fw2uw.htm2012-02-27T00:54:24ZThe original transistor-on-a-four-pole-switch transceiver.30m BAND UTILIZATION -- G3NRWhttps://bookmarks.offog.org/edit?url=http%3A%2F%2Fhomepage.ntlworld.com%2Fwadei%2F30m_band_utilization.htm2011-06-25T12:37:52ZGood visualisation.