radios:ic-7100
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| radios:ic-7100 [2025/12/21 18:57] – created m0mzf | radios:ic-7100 [2025/12/21 22:23] (current) – [Low transmit power on SSB] m0mzf | ||
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| ======= Icom IC-7100 ======= | ======= Icom IC-7100 ======= | ||
| - | An older offering from Icom, this is a great little radio. For us UK hams we get HF/2m/70cm including 5MHz and 70MHz. It's architecture is the older IF DPS design so it's hackable to include IF / RF taps if you want to add a panadapter. | + | An older offering from Icom, this is a great little radio. For us UK hams we get HF/2m/70cm including 5MHz and 70MHz. It's architecture is the older IF DSP design so it's hackable to include IF / RF taps if you want to add a panadapter. KV5R has [[https:// |
| ===== Diode Matrix ===== | ===== Diode Matrix ===== | ||
| Line 32: | Line 32: | ||
| < | < | ||
| - | North American | + | North America |
| 6308 6316 6324 6342 | 6308 6316 6324 6342 | ||
| 1 1 0 0 | 1 1 0 0 | ||
| Line 59: | Line 59: | ||
| </ | </ | ||
| - | A document published by Icom describes the diode mods for MARS/CAP as follows: | + | A document published by Icom [[https:// |
| **Remove D6315 and D6316** \\ | **Remove D6315 and D6316** \\ | ||
| Line 73: | Line 73: | ||
| **Remove D6316** \\ | **Remove D6316** \\ | ||
| - | 1.6 - 54M MHz \\ | + | 1.6 - 54 MHz \\ |
| 68 - 74.799999 MHz \\ | 68 - 74.799999 MHz \\ | ||
| 118 - 174 MHz \\ | 118 - 174 MHz \\ | ||
| Line 84: | Line 84: | ||
| The RF connectors on the radio are trivial to remove. There is a clip on the PCB which holds the centre pin of the RF connector, so swapping a connector is as simple as unscrewing it, pulling it out, and putting in a new one. The two-hole N-Female connectors sold by M0MAT on eBay are high quality PTFE insulated jobbies and fit perfectly. It's probably worth removing the top cover when you do this just to ensure that you are sliding the pin home correctly and not mashing the little clip. | The RF connectors on the radio are trivial to remove. There is a clip on the PCB which holds the centre pin of the RF connector, so swapping a connector is as simple as unscrewing it, pulling it out, and putting in a new one. The two-hole N-Female connectors sold by M0MAT on eBay are high quality PTFE insulated jobbies and fit perfectly. It's probably worth removing the top cover when you do this just to ensure that you are sliding the pin home correctly and not mashing the little clip. | ||
| - | On 70cm, into a quality dummy load, my transmit SWR was ~1.6:1. After swapping the connector the transmit SWR was close enough to 1:1 that the radio didn't display anything on the meter. | + | On 70cm, into a quality dummy load, my transmit SWR was ~1.6:1. After swapping the connector the transmit SWR was close enough to 1:1 that the radio didn't display anything on the meter. |
| + | |||
| + | M0UKD has [[https:// | ||
| ===== Low transmit power on SSB ===== | ===== Low transmit power on SSB ===== | ||
| - | Some of these radios appear to have a problem with their ALC circuit (and / or possibly the compressor) causing them to put out low-ish power on transmit. The radio I have doesn' | + | Some of these radios appear to have a problem with their ALC circuit (and / or possibly the compressor) causing them to put out low-ish power on transmit. The radio I have doesn' |
| 1. Upgrade the firmware, there are reports that Icom fixed this by changing ALC / Compressor parameters \\ | 1. Upgrade the firmware, there are reports that Icom fixed this by changing ALC / Compressor parameters \\ | ||
radios/ic-7100.1766343429.txt.gz · Last modified: by m0mzf