README.md

# Low Power Coaxial Relay v1.0 - RevB

The Coaxial Relay project for my Low Power VHF station. I was inspired by this [project Cheap High Power 50 / 144 MHz Relay](http://www.yu1cf.com/Cheap-High-Power-50-144MHz-Relay)

Aluminium case - 1590AFL HAMMOND [TME.cz](https://www.tme.eu/cz/details/hm-1590afl/univerzalni-krabicky/hammond/1590afl/)

ANT-TX Relay 12V/16A - TE Connectivity RT31L (7-1393239-3) or cheaper FUJITSU (FTR-K1CK012W)

RX relay - TE Connectivity HF6-56 or HF3-56

This version is NC for TX ans NO for TX 0V, RX ON=12V

## Relay RT31L inside mechanics detail
![Relay](img/relay01.jpg)

## Shematic
![SCHEMATIC](HW/sch.png)

## PCB
![BOT](HW/pcb_bot.png)
![TOP](HW/pcb_top.png)

## Photos
![001](img/001.jpg)
![002](img/002.jpg)
![003](img/003.jpg)
![004](img/004.jpg)
![005](img/005.jpg)
![006](img/006.jpg)
![007](img/007.jpg)
![008](img/008.jpg)
![009](img/009.jpg)

## Additional shielding for higher insulation between ANT and RX 
![005a](img/005a.jpg)

## Measurement (nanoVNA)
![graph1](img/att_ant-rx_graph.png)
![graph2](img/att_ant-tx_graph.png)

## Isolation ANT-RX
![isolation ant-tx](img/nanoVNA/RevB_isolation_ant-rx.png)

## Insertion Loss ANT-TX
![loss ant-tx](img/nanoVNA/RevB_loss_ant-tx.png)

## Intsertion Loss ANT-RX
![loss ant-rx](img/nanoVNA/RevB_loss_ant-rx.png)