Search found 991 matches

Mon 21 Feb 21 2022 1:44 pm
Forum: General Discussions
Topic: SARTS Repeaters
Replies: 51
Views: 20646

Re: SARTS Repeaters

Repeater Layout.png (344.03 KiB) Viewed 379 times
Fri 14 Jan 14 2022 8:58 am
Forum: General Discussions
Topic: SARTS Repeaters
Replies: 51
Views: 20646

Re: SARTS Repeaters

Default user repeater
Thu 30 Dec 30 2021 12:17 am
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1157

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...
Tue 28 Dec 28 2021 8:18 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1157

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...
Tue 28 Dec 28 2021 9:00 am
Topic: SunSDR2DX
Replies: 5
Views: 1587

Re: SunSDR2DX

Mon 27 Dec 27 2021 12:54 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1157

Re: EFHW and transformers

Comparing a 2x FT240-43, 3x FT-240-52 and 3x FT240-52 auto SWR into a 2450ohm resistor.
Fri 17 Dec 17 2021 11:55 am
Topic: SunSDR2DX
Replies: 5
Views: 1587

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)
``````
Tue 14 Dec 14 2021 12:18 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1157

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...
Mon 13 Dec 13 2021 7:20 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1157

Re: EFHW and transformers

EFHW8010-FT240-52-auto.png (26.54 KiB) Viewed 1154 times
Mon 13 Dec 13 2021 11:47 am
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 1157

EFHW and transformers

A comparison between the 49:1 transformers wound on FT240-43 (x1) and FT240-52 (x3).
EFHW4010-FT240-43.png (27.1 KiB) Viewed 1157 times
EFHW4010-FT240-52-auto.png (27.11 KiB) Viewed 1157 times