GenesisRadio G3020 Xcvr (BETA) 06_LP Filters and Pre-Amp

Remove the temporary Wire

Remove the wire that was used in the preceding phase to temporarily bridge the antenna signal into the mixers.

Install 2N3866 and heat sink

	NOTE: the heat sink is factory supplied so tight that it would not be possible to place it over the 2N3866 after the transistor is soldered to the PCB. Therefore it is important to insert the 2N3866 into the heat sink first.
	Prepare the heat sink by gently spreading its collar.
	Place the transistor over the heat sink with the marking lip in the middle of the gap, push it down with the flat side of metal tweezers. The grip should be firm and tight (if it is too tight or loose, remove the transistor and adjust the collar)
	The transistor and its heatsink will resemble this when ready for mounting
	Place the 2N3866 into PCB (marking lip alignment as per photo). Solder it approx 4-5 mm (about 3/16") above PCB, just enough to clear any surrounding components. It is important to solder this transistor sufficiently raised so that its metal case does not touch any of the plated through holes (won't work correctly if it does so touch). TIP: Initially, solder one lead only. Then adjust for height and level, as needed, and then solder the other two leads.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	misc6-1	TO-39 heatsink		Misc
❏	Q6-1	2N3866 NPN Transistor		TO-39

Wind and install L1 and L2

This transceiver requires exactly two wound toroids! L1 and L2, each wound on a T50-6 core with 0.8 mm (#20 AWG) wire, exactly as per photo.

Make sure to remove enamel coating and tin the leads before mounting. The length of wire required for each coil is about 13-14" (about 35 cm).

• L1: 11 turns - 0.56 uH (approximately 10" of #20 wire)
• L2: 12 turns - 0.64uH (approximately 11" of #20 wire)

Rule: Each pass through the center of the core (including the very first pass) counts as 1 turn. See the wb5rvz coil winding hints and tips for guidance on winding coils.

Install Diodes, Resistors, and Chokes

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	D6-1	1N4148	1N4148	Axial
❏	D6-2	1N4148	1N4148	Axial
❏	D6-3	1N4148	1N4148	Axial
❏	L6-1	470 nH molded inductor (0.47 uH)	yel-vio-slv_gld	Choke
❏	L6-2	820 nH molder inductor	gray-red-slvr-gld	Choke
❏	L6-3	820 nH molder inductor	gray-red-slvr-gld	Choke
❏	L6-5	47 uH molded inductor 10%	yel-vio-blk-slv	Choke		(reloc)
❏	R6-1	6R8 1/4W 1% (6.8)	blu-gry-blk-silver-brn	1/4W
❏	R6-2	33 1/4W 1%	ora-ora-blk-gld-brn	1/4W
❏	R6-3	33 1/4W 1%	ora-ora-blk-gld-brn	1/4W
❏	R6-4	68.0 1/4W 1%	blu-gry-blk-gld-brn	1/4W
❏	R6-5	68.0 1/4W 1%	blu-gry-blk-gld-brn	1/4W
❏	R6-6	220 1/4W 1%	red-red-blk-blk-brn	1/4W
❏	R6-7	220 1/4W 1%	red-red-blk-blk-brn	1/4W
❏	R6-8	330 1/4W 1%	ora-ora-blk-blk-brn	1/4W
❏	R6-9	390 1/4W 1%	ora-whi-blk-blk-brn	1/4W
❏	R6-10	560 1/4W 1%	grn-blu-blk-blk-brn	1/4W
❏	R6-11	1K5 (1.5k) 1/4W 1%	brn-grn-blk-brn-brn	1/4W

Install Capacitors

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	C6-16	22 pF disc ceramic	22J	Disc
❏	C6-17	47 pF disc ceramic	47J	Disc
❏	C6-1	56 pF 5%	56J	Ceramic
❏	C6-2	56 pF 5%	56J	Ceramic
❏	C6-18	180 pF disc ceramic	181	Disc
❏	C6-19	180 pF disc ceramic	181	Disc
❏	C6-20	180 pF disc ceramic	181	Disc
❏	C6-21	180 pF disc ceramic	181	Disc
❏	C6-3	220 pF 5%	221	Ceramic
❏	C6-4	220 pF 5%	221	Ceramic
❏	C6-5	560 pF	561	Ceramic
❏	C6-6	560 pF	561	Ceramic
❏	C6-10	100 nF	104	Ceramic
❏	C6-11	100 nF	104	Ceramic
❏	C6-12	100 nF	104	Ceramic
❏	C6-13	100 nF	104	Ceramic
❏	C6-14	100 nF	104	Ceramic
❏	C6-15	100 nF	104	Ceramic
❏	C6-7	100 nF	104	Ceramic
❏	C6-8	100 nF	104	Ceramic
❏	C6-9	100 nF	104	Ceramic

Install Relays and Jumpers

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	misc6-1	shunt wire (cut-off lead)		Cutoff
❏	misc6-2	shunt wire (cut-off lead)		Cutoff
❏	K1	JRC27F/012 relay	JRC27F/012	12V relay
❏	K2	JRC27F/012 relay	JRC27F/012	12V relay
❏	K3	JRC27F/012 relay	JRC27F/012	12V relay

Install Wires

Install the (permanent) W3 wire. Preferrably on the underside of the board, this wire connects the control of relay K2 to the mount point for the Attenuator Switch, allowing the Attenuator switch to switch V_RX in or out of the relay.

You can insert left-over component lead snippings or other wire snippets into the holes at either end of the wire (as markers, from the topside), then turn the board over and connect the permanent wire to each hole through which you inserted the "markers".