I recently acquired a used Codan 9780 HF transceiver. This is a commercial HF SSB transceiver that provides 15 user programmable channels in the 2.25 to 30MHz range. Power output is 125w of USB or LSB.
The radio was purchased without a microphone and I thought it would be straightforward to find a suitable replacement microphone, however a search online only found original replacement microphones at AU$ 389 - way more than I was prepared to pay.
I found the schematic of the Codan keypad microphone on the aboutcodan.blogspot.com blog - this is a very useful blog with lots of information on Codan 9xxx series radios , including how to enable programming of channels from the control panel.
The microphone schematic is here .
The schematic indicated that it would be possible to connect a normal dynamic microphone to the radio , leaving out the custom keypad controller. I had an old Pama dynamic CB microphone that looked suitable , so the next problem was to find a suitable microphone plug. Unfortunately the 9780 has a very custom 7 pin connector - I wasn't able to find a suitable connector at a reasonable price , but I found an eBay seller in Australia that had a replacement Codan microphone cable and plug for AU$ 65. This was ordered and it arrived about 2 weeks later . Mic plug shown below.
I found the pinout of the MIC socket in the Codan 9360 reference manual available here .
Note - this pinout is viewed from the perspective of the radio front panel, not from the microphone plug.
It was necessary to link pins 1 and 7 together in order to route the received audio to the front panel speaker. This is illustrated in the microphone schematic .
On connecting the microphone I found I was still not getting any audio out of the front panel speaker , so I plugged in an external speaker into the LS jack on the back . This worked.
On removing the front panel and testing the speaker I found that it was open circuit . The speaker is a 66mm diameter mylar speaker - maplin had a suitable replacement ( code VC86T) .
Once this was replaced I tried the radio out and made a number of contacts on 80m , 60m and 40m and received good audio reports.
Having only 15 channels is a limitation, but I plan to use it mainly on 60m where we only have access to 5 spot frequencies in Ireland.
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| Codan 9780 |
The radio was purchased without a microphone and I thought it would be straightforward to find a suitable replacement microphone, however a search online only found original replacement microphones at AU$ 389 - way more than I was prepared to pay.
I found the schematic of the Codan keypad microphone on the aboutcodan.blogspot.com blog - this is a very useful blog with lots of information on Codan 9xxx series radios , including how to enable programming of channels from the control panel.
The microphone schematic is here .
The schematic indicated that it would be possible to connect a normal dynamic microphone to the radio , leaving out the custom keypad controller. I had an old Pama dynamic CB microphone that looked suitable , so the next problem was to find a suitable microphone plug. Unfortunately the 9780 has a very custom 7 pin connector - I wasn't able to find a suitable connector at a reasonable price , but I found an eBay seller in Australia that had a replacement Codan microphone cable and plug for AU$ 65. This was ordered and it arrived about 2 weeks later . Mic plug shown below.
 |
| 9780 mic plug |
I found the pinout of the MIC socket in the Codan 9360 reference manual available here .
Note - this pinout is viewed from the perspective of the radio front panel, not from the microphone plug.
 |
| Microphone socket pinout |
It was necessary to link pins 1 and 7 together in order to route the received audio to the front panel speaker. This is illustrated in the microphone schematic .
On connecting the microphone I found I was still not getting any audio out of the front panel speaker , so I plugged in an external speaker into the LS jack on the back . This worked.
On removing the front panel and testing the speaker I found that it was open circuit . The speaker is a 66mm diameter mylar speaker - maplin had a suitable replacement ( code VC86T) .
 |
| front panel speaker |
Having only 15 channels is a limitation, but I plan to use it mainly on 60m where we only have access to 5 spot frequencies in Ireland.
