diff options
Diffstat (limited to 'README.md')
| -rw-r--r-- | README.md | 16 |
1 files changed, 13 insertions, 3 deletions
@@ -11,15 +11,25 @@ The firmware is MIT-licenced. * Designed in KiCad * Meant to be used with a microwave transverter - * But also stand-alone 28MHz and 144MHz (The IF bands) + * But also stand-alone 144MHz * Offer plug-in band-filters for other HF bands * Using a STM32F103C8T6 controller - * Si5351 clock source (generates 3 clocks) + * Programmed in [Rust](https://rust-lang.org/) + * Si5351 clock source (generates clocks) * An LCD display * Discarded ideas * Include a Lars Widenius GPSDO originally published on [eevblog](https://www.eevblog.com/forum/projects/lars-diy-gpsdo-with-arduino-and-1ns-resolution-tic/?all) * Offer a 10MHz output refclk for a transverter * Instead, have a 25MHz ref input, and use a LeoBodnar reference + * Use the Si5351 to generate the VHF LO at 116 MHz + * It wasn't clean enough, so a separate [XTAL LO board](./lo_board/) was designed + * With a 114.286 MHz crystal, we get a first IF of 29714 kHz + +*First QSO done with this transceiver and MMRF1021 amplifier on 2020-12-07* + +On RX, an [LNA4ALL](http://lna4all.blogspot.com/) LNA was used. On TX, 2x SPF5189Z, a bandpass filter to remove the LO, +and the [MMRF1021](http://git.mpb.li/git/mmrf1021-pa/about/) amplifier were used, giving about 200mW output power on the +very first trial. Open questions ============== @@ -34,8 +44,8 @@ Open questions Issues ====== -* VHF LO seems terribly noisy, try with external XTAL LO board * Coupling between VHF filter coils was way too large + * Fixed, replacement of coupling caps. * SEQ0 is used in inverted-logic in baseband, and noninverted for power relay * Due to inconsistent naming * Ugly fix on K603 side, use SEQ0n, SEQ1, SEQ2 |