JPLARC Repeaters Bob Dengler NO6B ...but first this message Los - - PowerPoint PPT Presentation

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JPLARC Repeaters Bob Dengler NO6B ...but first this message Los - - PowerPoint PPT Presentation

Dec 30, 2023 21 likes •329 views

JPLARC Repeaters Bob Dengler NO6B ...but first this message Los Angeles Marathon Amateur Communications No Club Communications Effort Coordinated by a Single Individual for All 34 Marathons Marathons 1-6, 8-18: Scott Fraser KN6F

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JPLARC Repeaters

Bob Dengler NO6B

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SLIDE 2

...but first this message

Los Angeles Marathon Amateur Communications

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No Club – Communications Effort Coordinated by a Single Individual for All 34 Marathons

  • Marathons 1-6, 8-18: Scott Fraser KN6F
  • Marathon 7: Hank Magid K6YMJ
  • Marathons 19-34 (present): Greg Powell KD6AIS

Scott Fraser KN6F Greg Powell KD6AIS

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SLIDE 4

Pre-Event Training Meetings

  • 2 held: weekday evening & Saturday afternoon.

Volunteers attend the one that’s most convenient

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SLIDE 5
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SLIDE 6

JPLARC Participation

  • In the past the JPLARC has been a major

contributor to this public service effort.

  • Total number of volunteers:

– First Marathon (1986): 267 – 2017 Marathon: 44 – Any further drop in amateur participation will likely result in dropping all support.

  • Sign up at lamarathon.ham-radio-op.net
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SLIDE 7

Remember: No News is Good News

...but listen to this anyway

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SLIDE 8

Definition of a Repeater

97.3 (a) (40): Repeater. An amateur station that simultaneously retransmits the transmission of another amateur station on a different channel or channels.

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What Is a Repeater?

RECEIVER TRANSMITTER CONTROLLER DUPLEXER POWER SUPPLY

COAX FEEDLINE

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What Do They Do?

  • Allow non line-of-sight communications on line-of-

sight frequency bands

  • Greatly enhance range of low EIRP stations (HTs)
  • Multiple repeaters can be interlinked, further

increasing their range

  • Operated as an auxiliary station, can serve as a

control point for remotely controlled base station

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SLIDE 11

First Wide-Coverage Repeater: WA6TDD Mt. Wilson

  • Owned/operated by Burt Weiner K6OQK
  • On air: Dec. 1962
  • AM
  • 145.424 MHz in/146.400 MHz out
  • FM input added 1972: 147.435 MHz

(Lots) more info at wa6tdd.tripod.com

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AM User Radio for 1st Repeater?

Photo by Joe Oliveira WB6BJM

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JPLARC’s Repeater History

  • Feb. 1977: First systems on the air: WR6APQ Mesa 224.04 (-), & WR6AZN

Table Mtn. 147.33 (+) & 224.04 (-)

  • Actual 1st repeater @ TMO: WR6AFX 146.76 (-) installed 4/15/1974, owned by

Helmut “Mickey” Mecke W6ZGC.

  • Aug. 1977: WR6APQ call changed to WR6APS
  • Feb. 1978: A 220 repeater list published in the club newsletter shows

WR6AZN on 223.96 (-); couldn’t find when the freq. change was made.

  • Mar. 1978: JPL/TMO link, connecting the Mesa 224.04 & TMO 223.96

repeaters, is placed in operation in Bellflower as WR6APQ.

  • Aug. 1978: Club private autopatch repeater WR6APR noted on-air on 224.08

(-). TMO 2 meter repeater moved from 147.33 (+) to 145.28 (-) due to interference with Mexican repeater on same freq. (still there today).

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JPLARC’s Repeater History

  • Feb. 1979: New 220 MHz Super StationMaster antenna

installed at Mesa site (was in service until bldg. 35 demo’d recently).

  • Nov. 1979: Autopatch on WR6APR 224.08 (-) operational.

Repeater status changes from open to private.

  • Sept. 1991: 147.150 (+) coordination issued to JPLARC;
  • riginally coordinated as WB6IEA but changed to W6VIO
  • 1994: W6VIO/R (formerly WR6APS) 224.04 moved to

224.08, WB6IEA/R (formerly WR6APR) 224.08 moved to 224.72

  • June 1995: WB6IEA/R moved from 224.72 to 224.70.
  • 1996: 440 repeater begins operation on the Mesa on

449.975.

From Mar. 1979 “W6VIO Calling”

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SLIDE 15

JPLARC’s Repeater History

  • Mar. 1998: 440 repeater moved from Mesa to Cerro

Negro, operating briefly on 440.125 (+) (!), then 447.65 (-).

  • 1999: All club repeaters except TMO change callsign to

WR6JPL; TMO repeaters get WR6AZN.

  • Nov. 1999: 440 repeater moved to permanent freq. of

445.20 (-).

  • Feb. 2000: WR6JPL (formerly W6VIO/R) 224.08 moved

from Mesa to Cerro Negro; WR6JPL (formerly WB6IEA/R) 224.70 moved from Cerro Negro to downtown LA.

  • Sept. 2013: Cerro Negro repeater site lost; 224.08 &

445.20 repeaters temporarily moved back to JPL Mesa site until a better site can be located.

  • Aug. 2016: 445.20 test repeater previously installed in

180-R6 replaces Mesa repeater, which is turned off due to unresolved receive issues & access problems.

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SLIDE 16
  • Cerro Negro Peak (~2.2 miles from JPL)
  • 224.08 (-) PL-156.7 WR6JPL
  • 445.20 (-) PL-103.5 WR6JPL
  • Mesa
  • 147.15 (+) PL-100.0 WR6JPL
  • TMO
  • 145.28 (-) PL-131.8 WR6AZN
  • 223.96 (-) PL-156.7 WR6AZN
  • 447.20 (-) PL-94.8 WR6AZN

JPLARC Repeaters

Always linked User- accessible link Linkable by control

  • perator

Configuration prior to loss of site

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SLIDE 17

JPLARC Repeaters

224.080 RX 222.360 TX 223.960 RX 222.480 TX WR6JPL/A CITY OF INDUSTRY LASO LINK LINK 144.680 RX 145.280 TX WR6AZN TABLE MTN. RPT PL-156.7 PL-131.8 WR6JPL/A

  • BLDG. 180 ROOM R6

224.080 RX 222.480 TX LINK PL-156.7 222.480 RX 445.200 TX 440.200 RX RPT RPT CERRO NEGRO PEAK WR6JPL PL-103.5 224.080 TX PL-156.7 PL-156.7

S Y S T E M B LOCK DIAGR AM

RPT 222.360 RX 223.960 TX PL-156.7 147.150 TX 147.750 RX PL-100.0 RPT JPL (MESA) WR6JPL

Jet P ropulsion Laboratory Amateur R adio Club Drawn by B

  • b Dengler NO6B

no6b@no6b.com 2/4/2013

PL-94.8 442.320 RX 447.320 TX RPT 223.100 RX 224.700 TX WR6JPL DIAMOND BAR RPT PL-114.8

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  • ~2.2 miles from JPL
  • 1887’ AMSL

Cerro Negro Peak

Coverage plot from “Radio Mobile”: http://www.cplus.org/rmw/english1.html

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  • <1 mile from JPL
  • 1504’ AMSL

JPL Mesa

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  • WR6JPL 224.08 (-) PL-156.7

(temporary at JPL Mesa)

  • Converted Midland 13-509
  • 12 watt output
  • WR6JPL 445.20 (-) PL-103.5

(temporarily at 180-R6)

  • Kenwood TK-805D/860H

w/Crescend amplifier

  • 100 watt output

Cerro Negro Peak Repeaters

Both repeaters controlled by LinkComm RLC-3 controller Both repeaters have IRLP & Echolink capability

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  • 147.15 (+) WR6JPL
  • 1991-2012: G.E. Mastr II

mobile

  • 50-70 watt output
  • Replaced with Kenwood

NXR-710 repeater & Crescend 100 watt amplifier

  • Carried space shuttle/ISS

audio for many years

JPL Mesa Repeaters

Photo by Jim Lux W6RMK

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SLIDE 22
  • 445.20 (-) WR6JPL
  • Kenwood TK-805D

(RX), TK-860H (TX, 35 watt output), LinkComm RLC-3 controller

  • Linked to 224.08 Mesa

system via Midland 13- 509 radio

  • Recently added

Crescend 100 watt amplifier

180-R6

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  • 30.6 miles from JPL
  • 7500’ AMSL

Table Mtn. Observatory

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  • 145.28 (-) WR6AZN
  • “Bill Wood special”:
  • modified VHF Engineering TX, ESP DFS-V RX
  • 25 40 watt output (once the repaired amplifier is reinstalled)
  • Current repeater installed in 1994
  • 223.96 (-) WR6AZN
  • “Bill Wood special”
  • 25 watt output
  • 447.20 (-) WR6AZN (antenna broken; waiting for replacement)
  • G.E. Mastr II
  • 40 watt output

TMO Repeaters

All 3 repeaters controlled by LinkComm RLC-3 controller

From May 1995 “W6VIO Calling”

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SLIDE 25
  • Autonomous RF link system connecting our 224.08 &

223.96 repeaters

  • Has 2 minute activity timer
  • Link on: DTMF “08961”
  • Link off: DTMF “08960”

JPL-TMO Link

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Fin

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  • Highly organized VOIP system specifically designed to

link amateur repeaters & simplex nodes only

  • Linux-based
  • Cross-linking to other VOIP services (i. e. Echolink)

generally prohibited; non-radio use strictly prohibited

  • Detailed network info available at irlp.net
  • Detailed info on our IRLP node available at

wr6jpl.ampr.org

IRLP: Internet Radio Linking Project

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SLIDE 28
  • How it works on our repeaters (224.08 & 445.20):
  • Every repeater on IRLP has a 4-digit DTMF

address (i. e. WB8VSU Dayton is 4235)

  • Our IRLP node uses a prefix of “8” in front of all

IRLP addresses

  • To access from our repeaters, a prefix is required

(33*) to pass DTMF from repeater to IRLP computer

  • To access Dayton repeater: 33*84235
  • Disconnect code is “73”
  • To disconnect from any repeater: 33*73

IRLP: Internet Radio Linking Project

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  • VOIP system for general amateur use
  • Runs on Windows or Linux (later via “EchoIRLP”,

which is what our node runs), Android OS & iOS

  • EchoMac for Mac (compatible w/Echolink nodes)
  • Can be used on repeaters, in the shack or even on

your smartphone

  • Any node can be a conference server
  • De-centralized nature makes it harder to get info on

available nodes

  • More info at echolink.org

Echolink

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  • How it works on our repeaters (224.08 & 445.20):
  • Every repeater on Echolink has a 4 to 6-digit DTMF

address (i. e. NO6B-R is 614325)

  • Our IRLP node uses a prefix of “A” in front of all

IRLP addresses

  • To access from our repeaters, a prefix is required

(33*) to pass DTMF from repeater to Echolink computer

  • To access NO6B-R: 33*A614325
  • Disconnect code is “73”
  • To disconnect from any repeater: 33*73

Echolink