Ensemble RX II 05_Auto Band Pass Filters

Install BPF In_Out Components

Includes winding and installing the two binocular transformers, T2 and T3.

T2 has a single primary and a single secondary windings; T3 one primary and two secondary windings.

The T3 secondary windings are connected by a trace on the board such that the secondary winding ends not connected together are 180 degrees phase different. Only one secondary winding is connected through the QSD switches of U10 at any instant of time resulting in signal integration on capacitors C20 and C21. T3 also provides a 4:1 Z transformation from the BPF to the QSD circuit.

ALERT! Original Ensemble RXII pcb layouts have an error in the placement of the leads for T2, the Antenna isolation transformer. If the antenna isolation transformer is not connected properly then the outer of the antenna coax will be prone to common mode currents causing noise pickup on receive and local emissions on transmit. The principle is that the grounded side of the isolation transformers should go to the same end of the primary and secondary. The two wires that come from the same hole in the binocular core.:must be switched (for one of the windings, primary or secondary - your choice). See the article by Alan G4ZFQ for IMPORTANT details.

Once the transformers are wound and installed, you should turn the board over and run continuity tests on the primary and secondary windings, per the above diagram

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	R23	2.2k 1/6W 5%	red-red-red-gld	1/6W	W-E
❏	T02	band-specific	Band Component Marking HF 23.04uH: 4T(bi)T #30(12 (2x6)in) on BN43-2402 (xfrmr) LF 70.56uH: 7T(bi)T #30(16 (2x8)in) on BN43-2402 (xfrmr)	misc
❏	T03	band-specific	Band Component Marking HF 23.04uH: 4T/2T(bi)T #30(12 (6/2x3)in) on BN43-2402 (xfrmr) LF 70.56uH: 7T/3T(bi)T #30(18 (8/2x5)in) on BN43-2402 (xfrmr)	misc
❏	R15	2.2k 1/6W 5%	red-red-red-gld	1/6W	N-S
❏	R16	2.2k 1/6W 5%	red-red-red-gld	1/6W	N-S
❏	R24	2.2k 1/6W 5%	red-red-red-gld	1/6W	W-E
❏	R25	10 ohm 1/4W 1%	br-blk-blk-gld-br	1/4W	E-W
❏	R26	10 ohm 1/4W 1%	br-blk-blk-gld-br	1/4W	E-W
❏	R27	2.2k 1/6W 5%	red-red-red-gld	1/6W
❏	R28	2.2k 1/6W 5%	red-red-red-gld	1/6W

Install and Continuity Test the Band 0 BPF

In this step and the two steps following it, you will build the bandpass filter for the band 0 passband.

Install the Band 0 Inductors

First, you want to wind and install the coils and then continuity test them. The continuity test checks for continuity between the points labeled "1" and then tests the continuity between the points labeled "2". Wherever possible, the test points have been assigned to vias removed from but electrically connected to the coils' vias, so as to give a good test of the soldering.

If you are unfamiliar with winding and installing inductors, you may want to refer to the WB5RVZ construction hints for coils (toroidal) and transformers ( toroidal and binocular). Click here for details on identifying toroid cores.

Decoding the trqansformer specifications:

Transformers' windings are specified using the pattern "nnT/wXmmT" or "wXmmT/nnT", where:

• "nn" is the number of turns in the single winding
• "mm" is the number of turns in the multiple windings
• "w" = the number of multiple windings (e.g., 2 = bifilar; 3 = trifilar, etc.)

Thus, e.g., "18T/2x9T bifilar #30" means, using #30 wire, produce a single 18 turn primary winding and two 9-turn secondary windings; "2x9T bifilar/ 18T #30" means, using #30 wire, produce two 9-turn primary windings and a single 18 turn secondary winding.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	L01	band-specific	Band Component Marking HF 5.5uH: 35T #30(20in) on T30-2(red) (coil) red LF 55uH: 117T #30(61in) on T37-2(red) (coil) red	misc
❏	L01-core	band-specific		misc
❏	L02	band-specific	Band Component Marking HF 2.6uH: 24T #30(15in) on T30-2(red) (coil) red LF 26uH: 80T #30(43in) on T37-2(red) (coil) red	misc
❏	L02-core	band-specific		misc
❏	L03	band-specific	Band Component Marking HF 5.5uH: 35T #30(20in) on T30-2(red) (coil) red LF 55uH: 117T #30(61in) on T37-2(red) (coil) red	misc
❏	L03-core	band-specific		misc

Install the Band 0 Static Components

Once you have successfully verified continuity, you can proceed to install the remaining parts for the passband.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	C06	band-specific	Band Component Marking HF 0.047 uF 5% (Ceramic) 473 LF shunt wire (cut-off lead) (Cutoff)	misc	vert	(jumper for LF)
❏	C07	band-specific	Band Component Marking HF 680 pF 5% (Ceramic) 681 LF 6800 pF 5% (Ceramic) 682	misc	vert
❏	C08	band-specific	Band Component Marking HF 1500 pF 10% (Ceramic) 152 LF 0.015 uF 5% (Ceramic) 153	misc	horiz
❏	C09	band-specific	Band Component Marking HF 680 pF 5% (Ceramic) 681 LF 6800 pF 5% (Ceramic) 682	misc	horiz
❏	R17	band-specific	Band Component Marking HF 75 1/6W 5% (1/6W) vio-grn-blk-gld LF omit for this band (Omit)	misc	S-N
❏	R18	band-specific	Band Component Marking HF 120 1/6W 5% (1/6W) brn-red-brn-gld LF shunt wire (cut-off lead) (Cutoff)	misc	N-S	(jumper for LF)
❏	R19	band-specific	Band Component Marking HF 75 1/6W 5% (1/6W) vio-grn-blk-gld LF omit for this band (Omit)	misc	E-W

Install and Continuity Test the Band 1 BPF

In this step and the two steps following it, you will build the bandpass filter for the band 1 passband.

First, you want to wind and install the coils and then continuity test them. The continuity test checks for continuity between the points labeled "1" and then tests the continuity between the points labeled "2". Wherever possible, the test points have been assigned to vias removed from but electrically connected to the coils' vias, so as to give a good test of the soldering.

Once you have successfully verified continuity, you can proceed to install the remaining parts for the passband.

Install the Band 1 Inductors

First, you want to wind and install the coils and then continuity test them. The continuity test checks for continuity between the points labeled "1" and then tests the continuity between the points labeled "2". Wherever possible, the test points have been assigned to vias removed from but electrically connected to the coils' vias, so as to give a good test of the soldering.

If you are unfamiliar with winding and installing inductors, you may want to refer to the WB5RVZ construction hints for coils (toroidal) and transformers ( toroidal and binocular). Click here for details on identifying toroid cores.

Decoding the trqansformer specifications:

Transformers' windings are specified using the pattern "nnT/wXmmT" or "wXmmT/nnT", where:

• "nn" is the number of turns in the single winding
• "mm" is the number of turns in the multiple windings
• "w" = the number of multiple windings (e.g., 2 = bifilar; 3 = trifilar, etc.)

Thus, e.g., "18T/2x9T bifilar #30" means, using #30 wire, produce a single 18 turn primary winding and two 9-turn secondary windings; "2x9T bifilar/ 18T #30" means, using #30 wire, produce two 9-turn primary windings and a single 18 turn secondary winding.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	L05	band-specific	Band Component Marking HF 0.46uH: 10T #30(8in) on T30-2(red) (coil) red LF 4.6uH: 32T #30(18in) on T30-2(red) (coil) red	misc
❏	L04	band-specific	Band Component Marking HF 2uH: 21T #30(13in) on T30-2(red) (Coil) red LF 20uH: 68T #30(36in) on T30-2(red) (coil) red	misc
❏	L06	band-specific	Band Component Marking HF 2uH: 21T #30(13in) on T30-2(red) (Coil) red LF 20uH: 68T #30(36in) on T30-2(red) (coil) red	misc

Install the Band 1 Static Components

Once you have successfully verified continuity, you can proceed to install the remaining parts for the passband.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	C10	band-specific	Band Component Marking HF 0.047 uF 5% (Ceramic) 473 LF shunt wire (cut-off lead) (Cutoff)	misc	vert	(jumper for LF)
❏	C11	band-specific	Band Component Marking HF 390 pF 5% (Ceramic) 391 LF 3300 pF 5% (Ceramic) 332	misc	vert
❏	C12	band-specific	Band Component Marking HF 1500 pF 10% (Ceramic) 152 LF 0.015 uF 5% (Ceramic) 153	misc	horiz
❏	C13	band-specific	Band Component Marking HF 390 pF 5% (Ceramic) 391 LF 3300 pF 5% (Ceramic) 332	misc	horiz
❏	R20	band-specific	Band Component Marking HF 75 1/6W 5% (1/6W) vio-grn-blk-gld LF omit for this band (Omit)	misc	S-N
❏	R21	band-specific	Band Component Marking HF 120 1/6W 5% (1/6W) brn-red-brn-gld LF shunt wire (cut-off lead) (Cutoff)	misc	N-S	(jumper for LF)
❏	R22	band-specific	Band Component Marking HF 75 1/6W 5% (1/6W) vio-grn-blk-gld LF omit for this band (Omit)	misc	W-E

Install and Continuity Test the Band 2 BPF

In this step and the two steps following it, you will build the bandpass filter for the band 2 passband.

First, you want to wind and install the coils and then continuity test them. The continuity test checks for continuity between the points labeled "1" and then tests the continuity between the points labeled "2". Wherever possible, the test points have been assigned to vias removed from but electrically connected to the coils' vias, so as to give a good test of the soldering.

Once you have successfully verified continuity, you can proceed to install the remaining parts for the passband.

Install the Band 2 Inductors

First, you want to wind and install the coils and then continuity test them. The continuity test checks for continuity between the points labeled "1" and then tests the continuity between the points labeled "2". Wherever possible, the test points have been assigned to vias removed from but electrically connected to the coils' vias, so as to give a good test of the soldering.

If you are unfamiliar with winding and installing inductors, you may want to refer to the WB5RVZ construction hints for coils (toroidal) and transformers ( toroidal and binocular). Click here for details on identifying toroid cores.

Decoding the trqansformer specifications:

Transformers' windings are specified using the pattern "nnT/wXmmT" or "wXmmT/nnT", where:

• "nn" is the number of turns in the single winding
• "mm" is the number of turns in the multiple windings
• "w" = the number of multiple windings (e.g., 2 = bifilar; 3 = trifilar, etc.)

Thus, e.g., "18T/2x9T bifilar #30" means, using #30 wire, produce a single 18 turn primary winding and two 9-turn secondary windings; "2x9T bifilar/ 18T #30" means, using #30 wire, produce two 9-turn primary windings and a single 18 turn secondary winding.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	L07	band-specific	Band Component Marking HF 1uH: 19T #30(9in) on T25-6(yel) (coil) yellow LF 10uH: 48T #30(26in) on T30-2(red) (coil) red	misc
❏	L07-core	band-specific		misc
❏	L08	band-specific	Band Component Marking HF 0.27 uH: 10T #30 (6") on T25-6 core (coil) yellow LF 2.7uH: 25T #30(15in) on T30-2(red) (coil) red	misc
❏	L08-core	band-specific		misc
❏	L09	band-specific	Band Component Marking HF 1uH: 19T #30(9in) on T25-6(yel) (coil) yellow LF 10uH: 48T #30(26in) on T30-2(red) (coil) red	misc
❏	L09-core	band-specific		misc

Install the Band 2 Static Components

Once you have successfully verified continuity, you can proceed to install the remaining parts for the passband.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	C14	band-specific	Band Component Marking HF 180 pF 5% (Ceramic) 181 LF 1800 pF 5% (Ceramic) 182	misc	horiz
❏	C15	band-specific	Band Component Marking HF 680 pF 5% (Ceramic) 681 LF 6800 pF 5% (Ceramic) 682	misc	horiz
❏	C16	band-specific	Band Component Marking HF 180 pF 5% (Ceramic) 181 LF 1800 pF 5% (Ceramic) 182	misc	horiz

Install and Continuity Test the Band 3 BPF

In this step and the two steps following it, you will build the bandpass filter for the band 3 passband.

First, you want to wind and install the coils and then continuity test them. The continuity test checks for continuity between the points labeled "1" and then tests the continuity between the points labeled "2". Wherever possible, the test points have been assigned to vias removed from but electrically connected to the coils' vias, so as to give a good test of the soldering.

Once you have successfully verified continuity, you can proceed to install the remaining parts for the passband.

Install the Band 3 Inductors

First, you want to wind and install the coils and then continuity test them. The continuity test checks for continuity between the points labeled "1" and then tests the continuity between the points labeled "2". Wherever possible, the test points have been assigned to vias removed from but electrically connected to the coils' vias, so as to give a good test of the soldering.

If you are unfamiliar with winding and installing inductors, you may want to refer to the WB5RVZ construction hints for coils (toroidal) and transformers ( toroidal and binocular). Click here for details on identifying toroid cores.

Decoding the trqansformer specifications:

Transformers' windings are specified using the pattern "nnT/wXmmT" or "wXmmT/nnT", where:

• "nn" is the number of turns in the single winding
• "mm" is the number of turns in the multiple windings
• "w" = the number of multiple windings (e.g., 2 = bifilar; 3 = trifilar, etc.)

Thus, e.g., "18T/2x9T bifilar #30" means, using #30 wire, produce a single 18 turn primary winding and two 9-turn secondary windings; "2x9T bifilar/ 18T #30" means, using #30 wire, produce two 9-turn primary windings and a single 18 turn secondary winding.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	L10	band-specific	Band Component Marking HF 0.46 uH: 13T #30 (7") on T25-6 core (coil) yellow LF 4.6uH: 32T #30(18in) on T30-2(red) (coil) red	misc
❏	L10-core	band-specific		misc
❏	L11	band-specific	Band Component Marking HF 0.13 uH: 7T #30 (5") on T25-6 core (coil) yellow LF 1.3uH: 17T #30(11in) on T30-2(red) (coil) red	misc
❏	L11-core	band-specific		misc
❏	L12	band-specific	Band Component Marking HF 0.46 uH: 13T #30 (7") on T25-6 core (coil) yellow LF 4.6uH: 32T #30(18in) on T30-2(red) (coil) red	misc
❏	L12-core	band-specific		misc

Install the Band 3 Static Components

Once you have successfully verified continuity, you can proceed to install the remaining parts for the passband.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	C17	band-specific	Band Component Marking HF 100 pF 5% (Ceramic) 101 LF 1000 pF 5% (Ceramic) 102	misc	vert
❏	C18	band-specific	Band Component Marking HF 390 pF 5% (Ceramic) 391 LF 3300 pF 5% (Ceramic) 332	misc	horiz
❏	C19	band-specific	Band Component Marking HF 100 pF 5% (Ceramic) 101 LF 1000 pF 5% (Ceramic) 102	misc	horiz

Install Antenna Jack

Note that there is an optional grounding via for the return side of the antenna connection. Normally, you would want to ground this to regular circuit ground. However, if you encounter significant ground loop problems, you may want to un-ground the antenna shield side.

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	J04	BNC Connector Male - PCB mount		Jack
❏	jmpr_ant	shunt wire (cut-off lead)		Cutoff		(see note)

Install Bottomside Components

Check	Designation	Component	Marking	Category	Orientation	Notes
❏	U08	FST3253 mux/demux switch	FST3253	SOIC-16		Take ESD precautions
❏	U09	FST3253 mux/demux switch	FST3253	SOIC-16		Take ESD precautions
❏	C37	0.1 uF	(smt) black stripe	SMT 1206	white pads
❏	C38	0.1 uF	(smt) black stripe	SMT 1206	yellow pads
❏	C39	0.1 uF	(smt) black stripe	SMT 1206	yellow pads
❏	C40	0.1 uF	(smt) black stripe	SMT 1206	yellow pads
❏	C41	0.1 uF	(smt) black stripe	SMT 1206	white pads
❏	C42	0.1 uF	(smt) black stripe	SMT 1206	yellow pads