station design for high performance:

K7WA - February 11, 2014

Station Design for High Performance:Switching, Filters, Triplexers, and Stubs

K7WA - February 11, 2014

High Performance(The Competitive Edge)

Innovations to:• Allow Automatic Bandswitching• Protect Receiver Front Ends• Reduce Interference• Reduce Operator Errors

K7WA - February 11, 2014

K7WA - February 11, 2014

Switching

K7WA - February 11, 2014

Band Coding (K3)Band Outputs (BAND0-BAND3):BAND0-3 provide band selection signals. With CONFIG:KIO3 set to NOR, the BAND0-3 outputs are mapped based on the selected HF-6 mband as shown below.

Band BAND3 BAND2 BAND1 BAND0

160 m 0 0 0 180 m 0 0 1 060 m 0 0 0 040 m 0 0 1 130 m 0 1 0 020 m 0 1 0 117 m 0 1 1 015 m 0 1 1 112 m 1 0 0 010 m 1 0 0 16 m 1 0 1 0

K7WA - February 11, 2014

K7WA Antenna SwitchingRadio

(Elecraft K3)

Decoder(W9XT BCD 10)

Relays(Top Ten)

80 M Vertical(Hustler 5BTV)

40 M Inverted Vee

Triband Yagi(Mosley Mini)

Antenna Tuner(Viking Matchbox)

K7WA - February 11, 2014

Filter Types

Roofing Filter DSP FilterHigh Pass FilterLow Pass FilterBand-stop FilterBand Pass FilterNotch Filter

“A filter is a common linear stage in radio equipment. Filters arecharacterized by their ability to selectively attenuate certainfrequencies in the filter’s stop band, while passing or amplifyingother frequencies in the passband.”

K7WA - February 11, 2014

Bandpass Filter Plots

K7WA - February 11, 2014

Hamation Switched BPF

K7WA - February 11, 2014

VP6DX Notch Filter

K7WA - February 11, 2014

Triplexer

K7WA - February 11, 2014

K7WA - February 11, 2014

N7PP Field Day (CW)

Station 120 M

Station 215 – 80 M

Station 310 – 40 M

Triplexer Tri BandYagi

80 MDipole

40 MYagi

BPF

BPF

BPFBPF

BPF

K7WA - February 11, 2014

Radio 1 Radio 2

SwitchableBandpass Filter

SwitchableBandpass Filter

SixPak1015204080

160

ManualCoax

Switch

6 Meter

15-20 Dipole

10-15-20 Vert

160 Inv L

TriPlexer 10-15-20 Yagi

40 M Yagi

80 M Inv Vee

KØAD Switching(RF Path)

K7WA - February 11, 2014

Radio 1 Radio 2

SwitchableBandpass Filter

SwitchableBandpass Filter

SixPak1015204080

160

ManualCoax

Switch

6 Meter

15-20 Dipole

10-15-20 Vert

160 Inv L

TriPlexer 10-15-20 Yagi

40 M Yagi

80 M Inv Vee

KØAD Switching

InterfaceBox

SixPakSwitch

Auto/ManualSwitch

Band Decoder 1 Band Decoder 2

To PC To PC

K7WA - February 11, 2014

Stubs

K7WA - February 11, 2014

Radio 1 Radio 2

SwitchableBandpass Filter

SwitchableBandpass Filter

SixPak1015204080

160

High Power Example with Stubs

InterfaceBox

SixPakSwitch

Auto/ManualSwitch

Band Decoder 1 Band Decoder 2

To PC To PC

Amplifier 1 Amplifier 2

Stub

Stub

Stub

10 M Ant

20 M Ant

80 M Ant

Stub

Stub

Stub

15 M Ant

40 M Ant

160 M Ant

K7WA - February 11, 2014

Station Design for High PerformanceReferences:

International Radio: www.inrad.netTop Ten Devices: www.qth.com/toptenHamation (K7MI): www.hamation.comArray Solutions (WX0B): www.arraysolutions.comDunestar: www.dunestar.comUnified Microsystems (W9XT): www.unifiedmicro.commicroHAM: www.microham-usa.com4O3A: www.4o3a.comVP6DX Receive Antennas:

www.ncjweb.com/200807NCJVP6DXreceiveantenna1.pdfNCCC: (Band-Pass Filters: JUG March 2013) www.nccc.ccTCDXA: www.tcdxa.orgYCCC: www.yccc.orgPVRC: www.pvrc.orgQST: Stubs (Nov. 2004, p. 61), Triplexer (June 2010, p. 37, June 2012, p. 54)