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public:radio:topics:arduino:30m_cw_tx [25/07/26 15:37 BST] – removed johnpublic:radio:topics:arduino:30m_cw_tx [29/07/26 07:32 BST] (current) – created john
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 +====== 30m CW TX ======
 +
 +
 +
 +====== My New 30m CW QRP TX is finished ======
 +
 +
 +This new TX is re-using PA strip I tried in the [[..:arduino:qrss_tx|]] I've changed the Arduino code and added a rotary encoder and LCD.
 +
 +==== Basic Architecture ====
 +
 +{{:public:radio:img_20260722_114412.jpg?direct&400|}}
 +
 +
 +I've also built a "QSK" board that handles the antenna changeover relay, TX VFO enable/disable and keying the driver stage of the PA strip. 
 +
 +{{:public:radio:img_20260722_113815.jpg?direct&400|}}
 +
 +It's still a work in progress....
 +
 +
 +The boards on the bench : 
 +
 +{{:public:radio:topics:arduino:30m_tx_1.jpg?direct&400|}}
 +
 +RBN Spots of me calling CQ with 1W - using the antenna c/o QSK board etc.
 +
 +{{:public:radio:topics:arduino:20260719_122720.png?direct&400|}}
 +
 +
 +===== Final Build =====
 +
 +I repurposed an enclosure from a previous project and started cramming everything in. 
 +
 +{{:public:radio:img_20260724_220944.jpg?direct&400|}}
 +
 +{{:public:blog:img_20260725_100129.jpg?direct&400|}}
 +
 +And here it is, finished and incorporated into the shack
 +
 +{{:public:radio:topics:arduino:img_20260725_135239.jpg?direct&400|}}
 +
 +The final feature set:
 +
 +  * Arduino (Seeeduino nano) controlling an SI5351 clock board
 +  * LCD Display
 +    * Frequency
 +    * RX / TX status
 +    * Approximate TX Power setting (calculated from PA supply Voltage measured by the Arduino ADC)
 +  * Semi-QSK
 +    * Internal Antenna C/O relay
 +    * RX Mute line (ground to mute)
 +  * Variable TX Output power via voltage regulator on DC supply to final class-C IRF510 MOSFET
 +    * Output adjustable 0.1W -> 5W
 +
 +===== Separate TX and RX =====
 +
 +I considered making a transceiver by putting the phasing RX [[..:arduino:30m_phasing_rx|]] and this TX together in one box, with a single Arduino / SI5351 but I decided to keep them totally separate. This harks back to an earlier time when this was a common way of operating. There is much more versatility from this approach.
 +
 +
 +===== Further Information =====
 +
 +
 +Page created  : 29/07/26 07:31 BST
 +
 +Page updated : ~~LASTMOD~~
 +
 +{{tag>radio cw homebrew}}
 +
 +
 +