Flex 6300 using ACC for mic input, level much lower then my 1500 was

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Ive seen post saying line input on the acc connector on back of a 6300 is low.

It mentioned new software will address this problem?????

Im using same mic and preamp as I do on my 1500 and its got plenty of audio, 6300 wont even do 30 watts unless I yell into mic.

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Dave Dave

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Posted 3 years ago

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Tim - W4TME, Customer Experience Manager

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This is a previously reported issue and it is in our bug tracker.  It has not been addressed to date.  I recommend using the front mic connector because the ACC connector is intended for consumer line in audio.
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Dave Dave

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Manual errors cost me time.  Manual says pin 5 of the ACC plug is ground, on my 6300 its not ground, pin 6 is.

In the manual it says the mic connector on front is UnBalanced however the Diagram says its balanced, it shows mic + and Mic - and also Ground, Mic - is chassis ground actually.

I have a preamp which gives plenty drive for my 1500, don't work on 6300, barely get 25 watts if I yell.

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James Whiteway

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From the User's Manual page 140 Phone Transmit Control:
Audio Input drop down (MIC is the default): Clicking on the dropdown box will display and allow for the selection of the primary audio input source. The audio input options are MIC (front panel 8-pin Foster connector), BAL (XLR balanced input) or LINE (TRS line level balanced audio input) , ACCY (rear panel accessory connector and PC (uses the default Windows recording sound device). The audio inputs XLR and LINE are only available on the FLEX-6500 and FLEX-6700.

The link I sent you about a post from Gerald Youngblood had the info about the front connector being unbalanced. But, also is simi-balanced.
 I think the Hardware Manual states the differences between the 65/6700 and the 6300 rear ACC

7.4.5 Pin 5, Mono Audio Line Out (FLEX-6300 only)
On the FLEX-6300, pin 5 is a mono (left / right combined) audio line output for connecting external device such as modems or TNCs.
7.4.6 Pin 5, Pin 6, Pin 7, Pin 8 and Pin 10: GROUND
These pins are all connected to chassis ground o the FLEX-6700 and FLEX-6500. Pin 5 is not a chassis ground for the FLEX-6300 (see above)

It appears that the 6300's line input on the ACC connector is not intended for audio input of the sort needed for SSB or other voice operations. Just Digital modes.