[Alexandria Radio Club Reflector] Invitation to Alexandria Radio Club Monthly Meeting via Zoom on Friday, May 14

[Don Lewis]

Attached is a copy of the slides presented by Barry at the club meeting
last night.

73
Don, KI4D


On Thu, May 13, 2021 at 6:26 AM Don (KI4D) <don.ki4d at gmail.com> wrote:

> Alexandria Radio Club is inviting you to a scheduled monthly meeting via
> Zoom.
>
>
>
> Time: May 14, 2021 07:00 PM Eastern Time (US and Canada)
>
> Featured Topic: Antenna Tuners: When do you need one, and how do they
> work; and other antenna matching techniques by Barry Feierman (K3EUI)
>
>
>
> Thanks to Barry, some may recall that he gave an excellent presentation on
> VNAs (Vector Network Analyzers) to our club last December.  Barry was
> licensed in 1958 (KN3EUI) as a teenager, and notes  that his knowledge of
> electronics was nil back then, but he could memorize hundreds of questions
> and answers to pass FCC tests. He confides that it took him decades to
> really understand radio concepts, which he would now like to share with
> others. He is a retired physics teacher/professor with a background in
> astrophysics. He loves to tinker with sound card digital modes and build
> and test antennas. He is the net manager of the Pennsylvania NBEMS (EMCOMM)
> net and active in ARES/RACES in Chester County PA. The  PA NBEMS PEMA net
> meets Sunday at 7:30 am and has grown to over 60 check-ins.  Out-of-state
> participants are welcome.  Using FLDIGI, frequency is 3583.0 kHz USB / 1500
> Hz Waterfall, the mode for initial call-up and check in is THOR 22 for
> check-ins and then using MFSK32 or THOR 50×1 for traffic.  Barry has
> authored:
>
> QST January 2018 - Join the FT8 Revolution, pp. 41-44
>
> QST May 2019 - FT8 in the RTTY Roundup, pp. 62-63
>
> His presentation abstract for the meeting follows:
>
> •             Why antennas have reactance  (phase errors) and how to
> correct the situation with a  "tuner" at the antenna, or in the shack.
>
> •             Detailed discussions of how the tuner provides a conjugate
> match, zeros out reactance, modifies impedance back to 50 ohms, and so the
> tuner provides a  "REFLECTION GAIN"  to offset the antenna mis-match loss.
>
> •             Antenna-feedline matching devices, including delta matching,
> gamma matching, stub matching, etc.
>
>
>
> Join the Zoom Meeting at
>
> https://us02web.zoom.us/j/81117755277?pwd=OGU4OUhQR1RpZDRONlgwQm5scmJSZz09
>
>
>
> Meeting ID: 811 1775 5277
>
> Passcode: 401751
>
> One tap mobile
>
> +13017158592,,81117755277#,,,,*401751# US (Washington DC)
>
> +13126266799,,81117755277#,,,,*401751# US (Chicago)
>
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