Search found 996 matches

by Daniel Wee
Mon 27 Dec 27 2021 12:54 pm
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 36799

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: 21739

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: 36799

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: 36799

Re: EFHW and transformers

EFHW8010-FT240-52-auto.png
EFHW8010-FT240-52-auto.png (26.54 KiB) Viewed 36796 times
by Daniel Wee
Mon 13 Dec 13 2021 11:47 am
Forum: General Discussions
Topic: EFHW and transformers
Replies: 5
Views: 36799

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 36799 times
EFHW4010-FT240-52-auto.png
EFHW4010-FT240-52-auto.png (27.11 KiB) Viewed 36799 times
by Daniel Wee
Thu 02 Dec 02 2021 1:37 am
Forum: Radios
Topic: SunSDR2DX
Replies: 5
Views: 21739

Re: SunSDR2DX

Okay yes!!!! The details for making the TCI bridge:- 1. Using the OLIMEX ESP32-PoE-ISO board 2. R37 needs to be removed from the board 3. The data input from the SPI to pin 36 of the board is clamped down with 1x LED and 2x 1N4148 types, all in series, giving a clamp of 1.7+0.6+0.6 = 2.9V roughly 4....
by Daniel Wee
Mon 22 Nov 22 2021 11:15 pm
Forum: Radios
Topic: SunSDR2DX
Replies: 5
Views: 21739

Re: SunSDR2DX

Dealing with crackling sounds in the audio:-

https://ttcshelbyville.wordpress.com/20 ... yEpnFANHeo
by Daniel Wee
Mon 15 Nov 15 2021 9:16 am
Forum: Space Balloon Project
Topic: LightAPRS settings
Replies: 0
Views: 22034

LightAPRS settings

Arduino IDE settings

Board: MightyCore->ATmega1284
Clock: External 8MHz
Compiler: LTO disabled
Variant: 1284P
Pinout: Standard pinout