21 Tech Net: 2025-11-16

Portable Doublet

I built a doublet experiment at a park today.

  • split 6.25M of speaker wire to be a 12.5M-long, center-fed, non-resonant dipole, like my portable EFRW I usually carry.
  • the rest is balanced feed line
  • right to the radio
  • tuned 20M and barely tuned 40M on my X6100
  • 2W FT8 heard in africa and europe
  • next try it with a 4:1 or 9:1 balun to match better

My Weeks in Radio

  • feel lucky to be in this area with lots of repeaters and traffic
  • flagpole with YAGI snapped in the wind a week or 2 ago.
  • strung the slim jim in the tree a little higher
  • playing with nicsure firmware on the RadTel RT-880G.
  • saw a great youtube video on APRS bots:
    • MPAD being very versatile for: weather, callsign lookup, location report to email
    • ISS bot that tells you the next pass
  • listened to a couple sweepstakes contacts: to lazy to try to communicate that much exchange QRP SSB

Others

  • WB3LNY, George:
    • Tried La Grange repeater in KY, but no one answered.
    • Keep as active as we can.
    • Use it or lose it: they’ll take it away
    • linking repeaters may help generate more traffic
  • VE3HOH, Pete:
    • working on some Yaesu FT-100’s
      • predecessor to FT-857.
  • KA3TKW, Tom:
    • lunch Thursday this week
      • everyone share a radio gadget
      • lots of mini demonstrations
    • ISS scrubbed the SSTV after first couple days
    • ISS ham repeater is still good though
      • high pass monday, 4:45pm
    • Russian satellites doing SSTV
      • 435.890 ARCTICSAT-1: 2 good passes Monday morning
      • 5 minute cycle, so don’t be discouraged
  • KK4KKW, Steve:
    • many times can’t make contacts while traveling: 2M or 10M
    • hearing people on HF, but not making contacts
  • N7JMS, John:
    • digipi doing SSTV to get ARCTICSAT-1 images
  • K3DMM, Denny:
    • doing some of the sweepstakes
      • got Hawaii
    • definitely trying morning pass of arcticsat-1
    • trying for ISS pass as well
  • KD3BOV, John:
    • rain gutter antenna
    • getting started with the ICOM 2730

Swap and Shop

  • WB3LNY, george:
    • new bird dummy loads
  • VE3HOH, Pete:
    • rohn 25 tower sections:
    • guy wire and anti-sway section for the rohn 25
    • 432MHz yagis
    • 2M yagis for weak signal
    • 950ft of philly strand on a roll
  • KA3TKW, Tom:
    • shortware receivers
    • moto 25W transceivers
    • 24ft camper for sale: $1500
doublet  dipole  park  21  tech  net  ka3tkw 

21 Tech Net: 2025-10-26

My Week in Radio

CQ WW DX SSB Contest

  • 12 contacts
    • including Canary Islands near Africa
    • heard lots of places that couldn’t hear me: Galapagos
  • QRP (<5W)
  • Logged in World Radio League website and phone
  • exported a Cabrillo file in the right format to submit!
  • POLO didn’t seem to collect the right fields

Great Ham Fest in Harrisburg

  • Saw some faces from a couple different repeaters I frequent
  • Tom’s satellite presentation was great, and we had a really good pass to hear the astronauts talking to the museum in Indiana.
  • Bought a cheap power meter for HF and some connectors for it

21 Technet: 2025-10-12

My Week in Radio

  • traveling:
    • cruise ships specifically forbid ham radios
    • practiced copying some CW
  • listened to a little PA QSO party, but didn’t participate
  • 21 has been lower power recently,
    • wondering if it’s my multiple antennas or the repeaters
    • definitely at least one feed line problem diagnosed during this net

Others

  • K3EA, Greg
    • QSO parties coming up
      • Germany
    • CQ WW SSB
    • Vanawatu, SSB
  • N7JMS, Jon
    • digi-pi
  • KC3ZBI, Ron
    • talking to a classroom about radio
  • KA0JQO, Kevin:
    • repeater power
    • when no double beep, then the repeater is putting out full power: 115W
    • when it’s beeping, the power is low: 20W.

Swap and Shop

  • KA3TKW, Tom:
    • shortwave receivers
technet  ka3tkw  21  net 

21 Technet: 2025-09-14

My Week in Radio

  • KC3WWC changed to KD3EE
    • nice for CW
    • start over with a whole new log book
    • days to find and update everywhere
  • packet radio for Winlink and BBSes including KA3TKW
    • like my old modem BBS days
    • phone + btech HT as TNC
  • POTA, FT8 + CW
    • new Gabil whip with the sliding coil is very convenient
    • learning value of chokes in the right places: computer interference from RF
    • chasing CW POTA from home
  • working a little more 10M now as we near autumn
  • have a google calendar feed from https://contestcalendar.com/ keeping my calendar very full should the mood to do some contesting strikes

Others

  • KA3TKW, Tom:
    • trivia net has new format: 5 digital
    • digipeaters
      • 145.010
      • 28.105
  • K3EA, Greg:
    • heard hamsci presentation:
      • study from eclipse
      • upcoming study on meteor scatter
    • training session on the local club station
    • contests:
      • AARL Sept VHF this past weekend
      • WAE SSB contest
      • next weekend: QSO parties
      • following weekend: CQ WW RTTY
      • https://contestcalendar.com/ for more details
    • solar flux index and sunspots down this past week
    • normal/average propagation
    • some disruptions coming up: increased K index
    • minor storms coming tomorrow.
    • check clusters for current DXpeditions
      • Palestine/West Bank on the air for about a week, FT8+CW
    • no QSL cards this week
  • WB3LNY, George:
    • local hamfest in Indiana
      • sold some LMR-400 + other things
    • new tower in place
  • VE3HOH, Pete:
    • recovering from back injury
    • cleaning up radios
    • working on some amplifiers
    • getting some HF wires up
  • KA3TKW, Tom:
    • Owen Garriott, W5LFL, was the first person to operate ham radio from space in 1983
    • easy sats:
      • ISS
      • SO-50: tues + wed 7:30pm
      • SO-124: tues + friday 12:25pm
      • SO-125: tues 11:25, wed 12pm, thurs 10:30am
    • looking for a presentation for next luncheon
  • K3DMM, Denny:
    • worked PO-101 earlier in the week
    • Route 66 on the air: 12 of 19 cities, and 2 of 5 rovers
      • request a cert with even 1 contact
    • met fellow ham at RV show, recognizing antenna
  • KC3ZBI, Ron:
    • had someone try to cut his coax
    • wondering about periodically reprogramming the keps in his OpenGD77 HT
    • Tom: every 10 days or so
  • W3MW, Don:
    • VHF contest, but not participating
    • antenna work in nice weather
    • looking forward to december contest
  • KC3NWN, Jim:
    • new alinco rig, 60m monoband, beam pointed to repeater
    • watched recent ISS pass
    • SO-50 often works for him
    • east stroudsburg hamfest
    • there’s AM on 17m
    • lots of simplex 2m and other VHF
    • QSL card from oklahoma on 17m

Swap and Shop

  • VE3HOH, Pete:
    • rohn tower with guy cable, 8 sections
21  technet  net  ka3tkw 

21 Technet: 2025-06-29

My Weeks in Radio

  • traveling
    • Chino Hills State Park near Los Angeles
    • 2 activations
    • hiked and biked my gear in on my back
  • Field Day QRP, emergency power, on the patio, at home, 650 pts

Others

  • K3EA, Greg:
    • in charge of antennas at local field day
    • 13 colonies coming up: https://13colonies.us/
    • Marconi Memorial contest
    • see the calendar
    • monitor FT8 or calling on 6M
    • good HF this week
    • Guyana: 8R1TM
    • Russians in Mozambique: C94RRC, C93RRC
    • LotW is undergoing maintenance
  • KB9AWS, Bernie:
    • hearing VHF openings in the morning
  • KC5DRI, John:
    • conversations with truckers while traveling NC on simplex
    • travel using repeaters
    • got to dayton this year
  • KA3TKW, Tom:
    • SSTV coming around july 4 from ISS, watch email
  • KK4KKW, Steve:
    • POTA Hunting
    • visited SPARC for field day
  • K3DMM, Denny:
    • heard lots of ISS contacts on field day
    • saturday is firecracker hamfest: postal picnic grounds
  • KC3NWN, Jim:
    • contact from a mobile at camp right now
  • VE3HOH, Pete:
    • local field day in macadoo
  • KC3VZU, Bob:
    • setting up a wire antenna and an HF rig
  • W3MW, Don:
    • lots of work getting antennas up
    • trying 10GHz, but blocked by foliage
21  ka3tkw  technet  net 

21 Lunch: 2025-03-27

Beacons and Online Tools to Predict Propagation

  • Presented by Greg, K3EA
  • RBN
  • Pskreporter
  • WSPRnet
  • VoaCap
  • Watch for openings on calling frequencies
  • ARRL band maps
  • Hamalert
  • Hamclock
  • DX clusters

A side note: SMRA hosts great presentations, so check them out some time.

21 Tech Net: 2025-02-23

My Week in Radio

  • I like radios with open software
    • F4HWN 4.0 alternate firmware released for Quansheng
      • includes fixes for the spectrum analyzer that I contributed
    • R1CBU 0.29.2 just released for Xiegu X6100
      • includes fixes for bugs I found and submitted
  • I tried some APRS to the ISS from the Btech UV-PRO
  • Did a little RTTY for NAQP
  • Contacted N4T DXpedition on 20M yesterday
    • My CW was pretty rough
    • I could hear them with the EFHW for 40M in a park,
      • but not the upgraded 107ft EFRW at home
      • probably orientation

Others

  • K3EA, Greg:
    • contests, space weather, DX
  • WB3LNY, George:
    • debugging power problems: tighten your lugs in your panel
    • “Pale Blue” is a company in Utah making rechargeable Li-Ion batteries with USB charging port.
  • VE3HOH, Pete:
    • designing an NVIS for 40m, fan dipole
    • maybe also a 10m vertical in it.
    • nice presentation from KA3TKW, Tom, on working satellites
  • KA3TKW, Tom:
    • new FM bird: Hades R, SO-124, no telemetry yet.
    • ISS repeater and upcoming passes
    • AO-123 is new, FM repeater: 435.400 FM.
    • Ham Lunch this Thursday, noon.
      • presentation: Beginners Guide to FM Satellites
  • KK4KKW, Steve:
    • some HF, but repeater started dropping
  • W3MW, Don:
    • trying to purchase a spectrum analyzer, but UPS isn’t delivering it.
    • starting up attic/roof work for antennas.
    • testing 10GHz setup soon
  • KC3ZBI, Ron:
    • working on antennas for some upcoming contests
tech  21  ka3tkw  net 

21 Tech Net: 2025-02-02

My Week in Radio

  • I did field day with a group out toward Parkesburg
    • I saw a fancy satellite station for sideband, etc in action
  • Attended the lunch on Thursday
  • Had Direwolf monitoring a plain ol’ Quansheng to decode packet
  • Btech UV-PRO
    • inexpensive
    • APRS location and messaging
    • KISS TNC over BT
    • WoAD on android
    • Winlink
    • Terminal to access BBS on KA3TKW
  • Trying to build a tactical delta loop
    • 4:1 balun
    • 2 17 ft whips
    • 25 ft wire for the top
    • 3d-printed base

Others

  • K3EA, Greg:
    • QSO parties
    • upcoming contests
    • Solar weather
    • DX
      • Wake Island on 10M
      • Gambia, 10-20m, FT8
        • our sunrise
      • Rowanda, 10-30m, FT8, CW
    • New DXCC programs
    • Cards from bureau
    • Will talk at march lunch about Hamcation in Orlando
  • WB3LNY, George:
    • headed to Hamcation in Orlando
  • KB9AWS, Bern:
    • New batteries
    • Appreciate the group you have, use the repeater
  • VE3HOH, Pete:
    • Working on a combo nvis dipole for 40 meters
      • 20 ft above ground
      • Inverted V
      • Combo it with a vertial for 10M
    • Looking at military antennas for manpack
      • 30MHz-512MHz rubber duck on eBay
    • Looking at some low-power, remote receivers
  • K3SWZ, Glenn:
    • Worked 20M helping test a new DX station in Kenya
  • KA3TKW, Tom:
    • 145.825MHz ISS packet digipeater
  • KB3MIJ, Tray:
    • Repairing some repeater hardware
    • Got a replacement generator for a site
  • K3DMM, Denny:
    • Lunch on Thursday
    • HT with Arrow to make ISS contacts and SO-50
    • Try Arrow from inside
  • KC3ZBI, Ron:
    • Lunch on Thursday
    • Starting figuring out LoTW
  • N3LJP, Bill:
    • Looking for charger for AA, AAA lithium batteries that runs off 120V.
    • KC3BOB, Bob:
      • Hobby King is a good mail-order shop for battery needs
    • KC3WWC, John:
      • I like my EBL chargers off Amazon
      • Inexpensive
  • KC3VZU, Bob:
    • Ham lunch, liked the presentation
    • Going to get HF rig up and running

Swap and shop

  • WB3LNY, George:
    • Looking for a teletype
  • VE3HOH, Pete:
    • Some yagis for weak signal work
    • Drake TR7
    • Kenwood 830
  • KA3TKW, Tom:
    • 25W Motorola mobile rigs
    • RadioShack SW receivers
    • Panasonic SW portable
  • KB3MIJ, Tray:
    • Jet turbine generator
21  technet  ka3tkw  net 

21 Tech Net: 2025-01-05

My Week in Radio

  • My favorite way to learn things: experiments
    • diagnose and repair a bad coax cable
      • no continuity on center conductor
      • plugged it into the nano vna, switched to smith chart
        • saw a big spiral around the outside
        • no change in the graph on the other side
        • compared to a working cable
        • it should have spiraled
        • maybe alonger spiral for a longer cable
    • 71 foot random wire with 5W is not needing the tuner
      • disconnected lots of different places and checked lots of SWR without those connections
  • Tossed a wire into a tree at Swatara State Park today for some POTA contacts
  • Operated the last 2 hours of the RTTY contest on 10m, 15m, and 20m.
ka3tkw  net  tech  21 

21 Tech Net: 2024-12-29

My Week in Radio

  • ISS on scan, so caught part of an image
    • passes are a bit early right now, and low
  • POTA yesterday:
    • 2 CW + 28 FT4 contacts on 20m
    • pretty rusty on throwing the line into the trees
    • bad section of coax
  • some antenna maintenance on a nice day

Others

  • K3EA, Greg:
    • Special event station with local station:
      • W2T, Battle of Trenton
      • W2P, Battle of Princeton
    • Contests
    • Propagation report and DX
      • Dominica
      • Fiji: 3D2GE, CW only
      • watch the DX clusters
    • after DXCC award, go for every country on every band.
  • WB3LNY, George
    • built a new pc with chirp, and synced up all his HTs
  • VE3HOH, Pete
    • cleanup, indoors.
  • KA3TKW, Tom:
    • ISS on night shift: good passes aren’t during the day.
      • there’s a packet digipeater
      • SSTV is active
      • it was only doing telemetry over the weekend
    • good passes for SO-50
    • https://n2yo.com/
    • ham lunch had about 32 people
    • thanks Glen for talking about DXCC
    • zbitx
      • 5 watt QRP SDR TRX
      • will be buying one
      • shipping in February
      • 44 bit ADC
  • K3DMM, Denny
    • caught SO-51 with a Baofeng 701
  • KC3VZU, Bob:
    • setup a new TYT 9000D with a slim jim outside
  • KK4KKW, Steve:
    • new end fed antenna strung into the trees, inverted L, trying it on 10M
  • KC3ZBI, Ron:
    • new antenna that’s not on the car now,

Swap and Shop

  • WB3LNY, George
    • dummy loads
  • VE3HOH, Pete
    • paddles, bugs
      • vibroplex
      • brown brothers
    • oscilliscopes
    • a couple Drake TR7s
    • tower sections
    • a couple Kenwood 130s
    • email is good on http://qrz.com/
  • KA3TKW, Tom:
    • 2 shortwave receivers: RadioShack DX440
      • 0-30MHz all mode
    • UHF motorola repeaters, 25W
    • Yaesu FT1XD, dual band, APRS
  • K3MIJ, Troy
    • looking for a commercial propane generator
21  ka3tkw  net