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Stealth Antenna Farm - k5rmg.comk5rmg.com/wp-content/uploads/2015/08/Stealth-Antenna-Farm.pdf ·...

Date post: 05-Nov-2018
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K5TRA Stealth Antenna Farm 1 T.Apel
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  • K5TRA

    Stealth Antenna Farm

    1T.Apel

  • K5TRA

    Preliminary Considerations

    2T.Apel

    Why stealth ? Restrictive neighborhood covenants !

    Attic performance factors Location /ground elevation

    Longley-Rice propagation plot for VHF/UHF/mWave

    Attic size and height

    Reflective clutter: furnace/AC/ducting

    Roof insulation (reflective or not)

    Feedline routing plan

    Improvements Plywood flooring

    120 V AC power

    Overhead lights

    CAT-5 ?

  • K5TRA

    440 MHz Longley-Rice Plot

    3T.Apel

    Analysis before I purchased my home

    Planned for repeaters and weak-signal operation

  • K5TRA

    Keys to Performance

    4T.Apel

    HF Balanced antennas: large loops or dipoles eliminates problems with

    grounding/counterpoise Lots of copper I use copper tubing for my HF loop A good balun with plenty of reserve power rating I use a 10KW, 4:1

    VHF-UHF-mWave Stacked beam antennas reduce boom length Line loss management is key to performance at higher frequency bands

    Remote LNA establishes system NF at antenna LNA preselector filter is a MUST below 440 MHz Remote PA provides free boost to transmit power CAT-5, IP control of remote power supplies for LNA/PA works well

    Omni antennas are useful for local QSOs

    Filters are needed with co-located transmitters / repeaters Receiver desense Reverse IMD

    Crossband couplers reduce the number feedlines

  • K5TRA T.Apel 5

    K5TRA Shack

    HF, 50 and 222 MHz

    144, 432, 902 and 1296 MHz

  • K5TRA

    Home Repeater

    6T.Apel

    927.1125

  • K5TRA

    Shack Configuration

    7T.Apel

    CROSSBAND

    COUPLER

    OMNI / YAGI

    SELECT

    CROSSBAND

    COUPLER

    CROSSBAND

    COUPLER

    440 MHz

    HF

    50 MHz222 MHz

    144 MHz432 MHz

    1296 MHz

    902 MHz

    927 MHz440 MHz

    HF

    6 M

    222 MHz XVTR

    1296 MHz XVTR

    902 MHz XVTR

    146 MHz

    432 MHz

    902 MHz

    144 MHz

    432 MHz

  • K5TRA

    HF and Weak Signal Antennas

    8T.Apel

    CROSSBAND

    COUPLER

    CWS

    10KW

    4:1 BALUN

    LOOP

    REMOTE

    TUNING

    CROSSBAND

    COUPLERCROSSBAND

    COUPLER

    OMNI / YAGI

    SELECT

    CROSSBAND

    COUPLER

    HF

    50 MHz222 MHz

    144 MHz432 MHz

    1296 MHz

    902 MHz

    927 MHz440 MHz

    HF COPPER TUBING LOOP

    50 MHzOMNI

    22

    2 M

    Hz

    OM

    NI

    14

    4, 4

    32

    , 90

    2 &

    1

    29

    6 M

    Hz

    STA

    CK

    90

    2 M

    Hz

    OM

    NI

    12

    96

    MH

    z O

    MN

    I

    Dia

    mo

    nd

    X-5

    0

    SCA

    LA O

    GB

    6-9

    00

    222 MHz

    144 MHz

    432 MHz

    50 MHz

    1296 MHz

    902 MHz

    440 MHz

    927 MHz

  • K5TRA

    Beam Antennas

    9T.Apel

    3 STACKED 144/432 5EL LP 17 ELEMENT M2 902 YAGI 2 x 22 ELEMENT M2 1296 YAGI

  • K5TRA

    CROSSBAND

    COUPLER

    Repeater and Link Antennas

    10T.Apel

    LINK-1

    927/902 MHzLINK-1

    443/448 MHz

    LINK-2

    927/902 MHz(ALLSTAR) LINK-1(ALLSTAR) LINK-2

    Dia

    mo

    nd

    X-5

    0

    SCA

    LA O

    GB

    9-9

    00

    Dia

    mo

    nd

    X-5

    0

    Dia

    mo

    nd

    X-5

    0

    Dia

    mo

    nd

    X-5

    0

    SCA

    LA O

    GB

    6-9

    00

    Ph

    elp

    s-D

    od

    geSt

    atio

    nM

    aste

    r-II

  • K5TRA

    Repeaters and Links

    11T.Apel

    CROSSBAND

    COUPLER

    U

    R

    I

    U

    R

    I

    U

    R

    I

    LINK-1

    927/902 MHzLINK-1

    443/448 MHz

    LINK-2

    927/902 MHzLINK-1LINK-2

    927/902 MHz

    LINK-1,LINK-2

  • K5TRA

    Balun Feed for HF Loop

    12T.Apel

  • K5TRA

    HF Loop Tuning Capacitor Switch

    13T.Apel

  • K5TRA

    WEB Controlled Power-Strip

    14T.Apel

    Remote PA and LNA on-off control

    HF loop tuning capacitor switching

  • K5TRA

    Remote 902 MHz and 1296 MHz LNAs

    15T.Apel

  • K5TRA

    Loss of LMR-400

    16T.Apel

    0.0

    1.0

    2.0

    3.0

    4.0

    5.0

    6.0

    0 500 1000 1500

    50 MHz

    144 MHz

    222 MHz

    432 MHz

    1296 MHz

    902 MHz

    (100 ft, with connectors)

    Loss

    (d

    B)

    Frequency (MHz)

  • K5TRA

    Sensitivity vs NF

    17T.Apel

    0%

    10%

    20%

    30%

    40%

    50%

    60%

    70%

    80%

    90%

    100%

    -143

    -141

    -139

    -137

    -135

    -133

    -131

    -129

    -127

    -125

    -123

    0.0 1.0 2.0 3.0 4.0 5.0 6.0

    SSB Sensitivity (dBm)

    CW Sensitivity (dBm)

    Degradation (%)

    SEN

    SITI

    VIT

    Y (d

    Bm

    )

    SEN

    SITI

    VIT

    Y D

    EGR

    AD

    ATIO

    N (

    %)

    NF (dB)

    SSB: 2.7 KHz BW, 10 dB S/N, 50 WCW: 500 Hz BW, 6 dB S/N, 50 W

  • K5TRA

    Sensitivity vs NF

    18T.Apel

    0%

    10%

    20%

    30%

    40%

    50%

    60%

    70%

    80%

    90%

    100%

    0.00

    0.02

    0.04

    0.06

    0.08

    0.10

    0.12

    0.14

    0.16

    0.18

    0.20

    0.0 1.0 2.0 3.0 4.0 5.0 6.0

    SSB Sensitivity (uV)

    CW Sensitivity (uV)

    Degradation (%)

    NF (dB)

    SEN

    SITI

    VIT

    Y (u

    V)

    SEN

    SITI

    VIT

    Y D

    EGR

    AD

    ATIO

    N (

    %)

    SSB: 2.7 KHz BW, 10 dB S/N, 50 WCW: 500 Hz BW, 6 dB S/N, 50 W

  • K5TRA

    Remote 902 MHz and 1296 MHz LNAs

    19T.Apel

  • K5TRA

    Schottky Detector

    20T.Apel

    222.060 MHz Beacon

    CONTROL SENSITIVITY DOWN TO +13 dBm

  • K5TRA

    Mini-Circuits ZX60-P162 LNA

    21T.Apel

    222.060 MHz Beacon

    0.5 dB NF and 20 dB gain

  • K5TRA

    VHF and UHF Remote LNAs

    22T.Apel

    222.060 MHz Beacon222 MHz ASSEMBLY

  • K5TRA

    Helical BPF

    23T.Apel

    222 MHz ASSEMBLY

  • K5TRA

    LNA Preselector Response

    24T.Apel

    222.060 MHz Beacon

  • K5TRA

    More Helical BPFs

    25T.Apel

    432 MHz ASSEMBLY

    144 MHz ASSEMBLY

  • K5TRA

    902 MHz and 1296 MHz Remote PA & LNA

    26T.Apel

    222.060 MHz Beacon

  • K5TRA

    900 MHz Remote PA & LNA

    27T.Apel

    222.060 MHz Beacon

  • K5TRA

    1296 MHz Remote PA & LNA

    28T.Apel

    222.060 MHz Beacon

  • K5TRA

    Modified 1296 MHz PA

    29T.Apel

    222.060 MHz Beacon

  • K5TRA

    VHF-UHF Remote PA & LNAs

    30T.Apel

    222.060 MHz Beacon4

    32

    MH

    z

    22

    2 M

    Hz

    14

    4 M

    Hz

  • K5TRA

    VHF-UHF Remote PA & LNAs

    31T.Apel

    222.060 MHz Beacon4

    32

    MH

    z

    22

    2 M

    Hz

    14

    4 M

    Hz

  • K5TRA

    222 MHz Remote PA & LNA

    32T.Apel

    222.060 MHz Beacon

  • K5TRA

    H-Polarized Omnis

    33T.Apel

    CIRCULARCOLLINEAR50 MHz OMNI

    FOLDED DIPOLE222 MHz WHEEL

    22

    2 M

    Hz

    HEL

    ICA

    L C

    OLL

    INEA

    R

    12

    96

    MH

    z H

    ELIC

    AL

    CO

    LLIN

    EAR

    90

    2 M

    Hz

    HEL

    ICA

    L C

    OLL

    INEA

    R

  • K5TRA

    927 MHz Notch Cavity with 902 MHz Omni

    34T.Apel

    Hi Q

    l

    CA

    VIT

    YN

    OTC

    H F

    ILTE

    R

    HEL

    LIC

    AL

    CO

    LLIN

    EAR

    H-P

    OLA

    RIZ

    ED O

    MN

    I

  • K5TRA

    Link Radios Share Feedline and Antenna

    35T.Apel

    Frequency 1 Frequency 2

    PASS F1REJECT F2

    PASS F2REJECT F1

    REJECT F3UHF Repeater

    SHARED LINK ANTENNA

  • K5TRA

    Crossband Couplers

    36T.Apel

    (BAND SPLIT DIPLEXERS)

  • K5TRA

    Some Attic Photos

    37T.Apel

  • K5TRA

    Summary

    38T.Apel

    Location, location, location ! (elevation, elevation, )

    Plan before you begin

    Key to performance:

    Remote LAN with BPF Establish NF at antenna !

    Remote PA

    Filters needed for co-located links and repeaters

    Crossband couplers for efficient use of coax runs

    Link radios can share feed and antenna through cavity duplexer

    No rain, lightning or UV deterioration

    Easy maintenance


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