Just a quick followup from the previous video https://www.youtube.com/watch?v=JgiakIxMjfI&t=104s Where I do the two tone test against the 70 W amplifier kit. Funnily enough just after I finished the video two more IRF530s gave their lives - next vid will definitely have the temperature protection in. Here's the video and site I mentioned with all the mods https://f5npv.wordpress.com/irf530-mosfet-amplifier/ https://www.youtube.com/watch?v=m0BD5l2JrfU (thank you for the tip Peter - for some reason your comments aren't appearing on the previous video) Schematic https://github.com/thaaraak/70W-Amplifier/blob/main/70W-Amplifier.pdf 0:00 Intro 1:08 Test Setup with Magnis as Exciter 3:01 Two tone with Magnis as Baseline 3:50 Magnis on Spectrum Analyzer 5:19 Two tones not quite Pure? 5:39 Two tone from the Amplifier 7:00 Amplifier on the Spectrum analyzer 8:44 Close up of Amplifier and other mods to do 11:31 Some tests with a 15 ohm resistor at R6 (see schematic link) 11:54 on the oscilloscope 12:23 and on the spectrum analyzer ... https://www.youtube.com/watch?v=ZvDppBOvhtI

This video completes the series with the transmitter assembly, power testing and on the air. The 15W QRPoMeter can be found on eBay. I have nothing to to with this product but its a fun and effective little kit https://www.ebay.com/itm/QRPoMeter-Digital-15W-QRP-Wattmeter-Dummy-Load-VSWR-Meter-Kit/254438084535 ... https://www.youtube.com/watch?v=hjk74vSZF8o

... https://www.youtube.com/watch?v=ElA_qMvKZOU

Dan Tayloe's original document http://www.norcalqrp.org/files/Tayloe_mixer_x3a.pdf The Eagle files for the board are here https://github.com/thaaraak/Tinypico-Radio/tree/master/eagle No changes to the micropython source for this video I meant to say LM4562 - https://www.ti.com/lit/ds/symlink/lm4562.pdf A separate debugging video is here: https://youtu.be/EarY64Lf3ls ... https://www.youtube.com/watch?v=iwBk3jIxszI