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The audio on this 778 sounds great, both Tx and Rx. The electret microphone seems to pass more lows than the Anytone and President radios that I am used to. The fix for the Anytone and President microphones is to use an element from a telephone handset to get a little lower response, but the 778...
Another chance to get the bundle for $239 from the 25th to the 28th of this month.
https://www.radioddity.com/collections/flash-sale?utm_source=pushowl&utm_medium=campaign&utm_campaign=3348204&pn_source=campaign&pn_source_id=3348204&subscriber_id=295318459
Inside the radio we have IRF 520 in a 1x2 configuration driven with a driver and predriver transistor. This radio should drive a 4 pill amp nicely. Heavy cast heatsink and thick chassis sides should be able to deal with the heat satisfactorily.
I recently got my hands on a Luiton LT-778 mobile transceiver. It is a basic AM/FM radio without VOX, DSP Noise Reduction or even a menu for user functions. All the functions are with buttons on the front of the radio making it a great candidate for mobile use; menus can be quite distracting...
I usually adjust bias by measuring the current going to the radio. With the mic keyed in ssb with no audio, watch the current to see when it starts to conduct. Then turn it down until it doesn't conduct. You want it right on the edge of turning on.
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