Search found 991 matches

by Daniel Wee
Mon 21 Feb 21 2022 1:44 pm
Forum: General Discussions
Topic: SARTS Repeaters
Replies: 51
Views: 22308

Re: SARTS Repeaters

Repeater Layout.png
Repeater Layout.png (344.03 KiB) Viewed 558 times
by Daniel Wee
Fri 14 Jan 14 2022 8:58 am
Forum: General Discussions
Topic: SARTS Repeaters
Replies: 51
Views: 22308

Re: SARTS Repeaters

AllStarLink hostname repeater
Default user repeater
by Daniel Wee
Thu 30 Dec 30 2021 12:17 am
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1430

Re: EFHW and transformers

https://squashpractice.com/2021/06/23/performance-of-491-ferrite-core-transformers/?fbclid=IwAR1vis8_bEvHLlQhPsAjzY0SdWviThCtxwa3v2eueJaTZ_xKEqKhRQgNFa8 https://squashpractice.com/2021/07/20/engineering-the-efhw-491-transformer-and-antenna/ https://f5npv.wordpress.com/endfed-cmc/?fbclid=IwAR10kPpQU4...
by Daniel Wee
Tue 28 Dec 28 2021 8:18 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1430

Re: EFHW and transformers

import math #material52 = {"Al":325, "ui":250, "B":4200, "H":10, "Br":2900, "Hc":0.6, "Tc":250, "r":10e9, "u1":305, "u2":73.8} # Al = 325 material52 = {"Al":325, "ui":250, "B...
by Daniel Wee
Tue 28 Dec 28 2021 9:00 am
Forum: Radios
Topic: SunSDR2DX
Replies: 5
Views: 1848

Re: SunSDR2DX

by Daniel Wee
Mon 27 Dec 27 2021 12:54 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1430

Re: EFHW and transformers

Comparing a 2x FT240-43, 3x FT-240-52 and 3x FT240-52 auto SWR into a 2450ohm resistor.
by Daniel Wee
Fri 17 Dec 17 2021 11:55 am
Forum: Radios
Topic: SunSDR2DX
Replies: 5
Views: 1848

Re: SunSDR2DX

Code: Select all

GND	Black
TX TTL	Blue
RX TTL	White
RLY	Brown
ALC	Green
Remote	Red

SunSDR	SPE	Board	ESP32
Brown	Brown
Black		GND
	Black	GND
	White		U1TXD (GPIO4)
	Blue LED	U1RXD (GPIO36)
ALC	Green
		GND	GND (3)
		Opto1	GPIO5
	Red	Opto4
Red		Opto3 (1k)
by Daniel Wee
Tue 14 Dec 14 2021 12:18 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1430

Re: EFHW and transformers

More tests with the 8010 with various configurations. EFHW8010-FT240-52-auto2.png EFHW8010-FT240-52-auto2-coil.png EFHW8010-FT240-52-auto2-noground.png EFHW8010-FT240-52-auto2-noground-elevated1.png EFHW8010-FT240-52-auto2-grounded-elevated1.png EFHW8010-FT240-52-noground-elevated1.png EFHW8010-FT24...
by Daniel Wee
Mon 13 Dec 13 2021 7:20 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1430

Re: EFHW and transformers

EFHW8010-FT240-52-auto.png
EFHW8010-FT240-52-auto.png (26.54 KiB) Viewed 1427 times
by Daniel Wee
Mon 13 Dec 13 2021 11:47 am
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1430

EFHW and transformers

A comparison between the 49:1 transformers wound on FT240-43 (x1) and FT240-52 (x3).
EFHW4010-FT240-43.png
EFHW4010-FT240-43.png (27.1 KiB) Viewed 1430 times
EFHW4010-FT240-52-auto.png
EFHW4010-FT240-52-auto.png (27.11 KiB) Viewed 1430 times