And of course we don't have direct access to that because there is a control IC in the way. The long awaited Alinco Dr 135DX (similar to cre 8900 needle head with) 10 m/11 m CB/amateur radio, and comes with a height adjustable black barrel. So if the powers to be varied, it has to be done within the RDA1846 itself. a variable resistor) between the output of the RDA1846 and the final stage. BuySecond Hand CRE-8900 Multimode Radio for best prices at .uk we offer Low Prices, A wide range of accessories with Fast Worldwide Delivery. Way within the 12V maximum, anyway.ĮDIT: To try to answer the question as asked, there is no straightforward way of changing the power output, as the circuit does not look like it has any way of adjusting the level of the signal going into the finals. The Vgs has a maximum of 12V, but it looks like the main IC (although I might be mistaken here) uses a supply voltage of 3.3V, so I would expect that to be the approximate level of the input to the finals. Looking at the specifications sheet, the transistor's maximum drain-to-source voltage (Vdss in the spec sheet) is 30V, so I would not be worried about the finals unless you're using more than double the 13.8V you are worrying about.
It operates on an HF frequency band and supports AM, FM, CW and SSB modes, as well as Upper. The circuit diagram for the KT9800 can be found here, along with the specifications for the RF finals here. The CRE8900 is a multi-modal CB radio for mobile or in-vehicle use.