View source for ΜBITX/Power, spurs, and harmonics

== Parts and instructions ==

=== Levelling out power ===

[http://ubitx.net/2018/06/11/evening-up-power-output-interim-suggestions-from-allison-kb1gmx/ KB1GMX's fix]:

* Replace the 2N3904s (Q911, Q912, Q92, Q93, Q96, Q97) with 2n2222 (TO18) (using the shortest leads possible).
* Stack 22Ω 1206 SMD resistors parallel to R941, R911, R96, and R942 (for 11Ω each)
* Replace Q90 with BFR106
* Increase R81 to between 2KΩ and 2.7KΩ
* Change C81 to 470 pf

=== Reducing harmonics ===

[http://ubitx.net/spectral-purity/ Replace the four relays with]
* 4 × Axicom D2n 12v relays (model V23105-A5403-A201

=== Reducing spurs ===

[http://ubitx.net/2018/10/10/rajs-second-spurs-mod-simpler-again/ Replace L5 & L7] with

* 2 × 1210 SMD inductors at 680nH or 681nH

=== Dummy load watt meter ===
Per [https://electronics.stackexchange.com/questions/515069/mimicking-dvm-10-to-11m%ce%a9-input-impedance-on-microcontroller-analogue-input this post of mine].

* 1 × MCP6021 op amp