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Switching type power converters have a high enough frequency that the ripple in the output should not cause any noticable interference. The ripple in the ones in the link above are 50 mV @ 25 kHz. If this did cause a problem you could filter out this ripple with a 12V motorcycle battery. A battery would also let you get away with using a smaller power supply as most tranceivers only use the max power during the transmit cycle and use very little power in receive mode.
If you are running a typical 5W hand held transciever, the power use is insignificant for most converters as it would use about 0.5 amp @ 12V.
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