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What would you say the best way to set the audio is? I have tried using internet sdr's, and a 2nd receiver with headphones and a recording from the 2nd receiver?

What does the group think about using an external audio equalizer vs an internal one on the radios that have them, is one really necessary? I am using a FTDX3000 with a Heil PR781 microphone, I use the built in equalizer and most people say the audio is better with the equalizer enabled. Is an...

The 4000 chip is an MFC4000B it is a 250mw audio amp, it is a 4 pin device. The MC3360P is the same device in an 8 pin pkg. I am having trouble uploading the spec sheet, a google search should find them.

Anyone know the audio frequency response of the transmiter?

Thanks for the additional info, I will check out the MC3360p.

I am going to try the lm386 just for grins, it may work better than the original, you never know until you try it.

It might work, the Motorola chip is a 4 pin device, the lm386 is 8 pin, looking at the data sheet the schematic is similar, I will compare both schematics for compatibly. Thanks for the tip.

I may have to do that, I have been checking local sources and may have located one. Thanks for the suggestion.

I am looking for a Motorola chip for this mike, part number is MFC 4000B. I have found several places on line selling this part or the equivalent for $20.00 or more, is this the going rate or can it be obtained for less? Any suggestions would be appreciated.

If anyone is interested in the penetrator project, I have some material left over from my project, it is 1 1/4 ID x 1 5/8 OD.

Thanks for your reply.

Seems a bit strange to me, most other radios I am familiar with allow you to use the entire range of the mike control. I wasn't sure if there was a problem with the radio or my procedure was incorrect. Thanks for the reply.

I noticed it when trying to set modulation. I turn the mike gain to max then set modulation to 100%, when I go back and check modulation level using the mike gain it reaches 100% at the 12 o'clock position. I am feeding a 30mv 1250hz audio signal in and using an oscilloscope connected to an rf...

The mike gain control on my 955hpc only works up to the half way point, when I turn it past the 12 o'clock position there is no further effect on the gain. Is this normal? If any 955 owners could check their radios I would greatly appreciate it.

The original plan was for a 3kw dc-70cm dummy load but I ran into some problems so the project got put on hold, I also have a tendency to go overboard sometimes.

Thanks.

I figured I would have to adjust the am modulation. Did you have any problem with the size of the pots?

I'm also interested in using these chip resistors for a dummy load. My concern is they won't be able dissipate large amounts of power for an extended period of time. With the device being so small I don't think it can dissipate the heat fast enough. I have a 16x10x1/4 inch cooper heat...

Would there be any advantage to changing the bias on this amp to a regulated bias instead of the self bias it currently employs? I plan on running it at 250 watts max. My goal is to get a good sounding am station with minimal interference to other channels. Would the new President McKinley be...