Differences

This shows you the differences between two versions of the page.

--- packet:ft-450d [2023/04/09 12:52] – [Method] m0lte
+++ packet:ft-450d [2024/04/07 17:23] – m0lte
@@ Line 1: / Line 1: @@
 ====== Yaesu FT-450D ======
-The Yaesu FT-450D works well with the NinoTNC but requires an audio isolation interface between the TNC and the radio, since it doesn't like sharing a ground with the TNC / PC, at least in my setup.
+m to 6m with ATU capable of matching 3:1, 100W. RS232 CAT control. 6 pin mini DIN data port. Easily modified for RF or IF output to an SDR using a HupRF board.
+{{ :radios:yaesu-ft-450d-manual.pdf | User manual }}
-===== Method =====
+{{ :radios:yaesu-ft-450d-service-manual.pdf | Service manual}}
-Bring 5V out of the NinoTNC on DB9 pin 7 using a bodge wire.
+{{ :packet:yaesu-ft-450d-hidden-menu.pdf | Service menu}}
-{{:packet:img_1604.jpg?400|}}
+===== TNC cable =====
-Connect DB9 pin 7 to the relay coil, and the other side of the relay coil to DB9 pin 3, the PTT pin. When the NinoTNC keys up the radio, the PTT pin is grounded, creating a circuit between +5V and ground, energising the relay coil.
+{{:packet:ft-450d_data_jack.png|}}
-Run the TX and RX audio pins from the DB9 through standard audio transformers.
+| **Pin** | **Use**  | **NinoTNC / Kantronics pin** |
+| 1       | TX audio | 1               |
+| 2       | Ground   | 6               |
+| 3       | PTT      | 3               |
+| 5       | RX audio | 5               |
-Connect as normal on the radio side.
-{{:packet:img_1607.jpg?400|}}
+A suitable cable can be made from a PS/2 extension lead, scrap PS/2 mouse or keyboard. Sometimes with the mouse/keyboard option, not all of the required pins are populated, so may not be suitable. Identify the pins with a multimeter (a croc clip lead is useful here.) Solder a DB9 plug on to the other end as above.
+===== Usage with NinoTNC =====
+The Yaesu FT-450D works well with the NinoTNC but requires some audio isolation between the TNC and the radio in some circumstances. This can manifest as wideband noise on transmit. Discussion was had [[https://discord.com/channels/715554730323083274/1204840691142889562|here]].
+Full isolation (including PTT) does not appear to be required - simply cut the ground and TX audio lines in your radio-TNC cable and insert an audio transformer between them. Ensure there is a ground path for the PTT line - in my case, using a Pi with a 12V-5V DC-DC converter, it was sufficient to ensure that the negative side of the input and the output of the DC-DC converter were common.
+{{:packet:ft-450d-ninotnc-pipsu.png|}}
+Detail of audio isolation:
+{{:packet:ft-450d-ninotnc-txa-isolation.png|}}
+Previously there was an article here involving a full isolation circuit with relay powered by DC brought out from the TNC, but this has proven to not be necessary.
+{{tag>radio packet hf}}
+===== Errata =====
+M0GZP has found, empirically, that both the input and output pins should perhaps be documented at 60mV instead of 500mV. This is why the NinoTNC SIGNALS settings of 0000 works for this radio, which is unexpected.