[TenTec] Fwd: Model 715 question / Yamaha CM500 bias

[Richards]

> Since you mentioned the Yamaha CM500 - I can tell you that it will not take
> the 10 volts - wont hurt it but it does not like it -

		TRY USING AN IN-LINE ATTENUATOR LIKE THIS:

	http://andreaelectronics.com/Buy/ProductDesc/S100.htm

	OR THIS...

	http://www.fullcompass.com/product/399621.html

	OR....

	I recall RadioShack used to carry an in-line headphone
	attenuator,  and also an inline audio line-level-to-mic-level
	attenuator cable, which should also work to knock down
	high signal level coming from the Yamaha set.

	I was a big hero at the contest station (my rookie season)
	because I was able to tame this problem on the Omni VII
	and Orion II they have there.  All the rigs were either K3s
	or TenTec Omni VI, VII or Orion II radios.  It's very cool...


.I just kept adding more resistance from the ten volts to the mic
> element until it sounded OK. BUT its still way too much output - mic gain
> has to be set very low - one of these days I am going to mke a voltage
> divider up inside the connector shell .


		The attenuators do not reduce the voltage on the
		electret capsule, but they do reduce the resulting
		output signal level.   Maybe this will make it for you.


> The little battery voltage inserter that comes with the CM500 applies  the
> voltage from two AAA cells in series (abt 3 volts) through 2200 ohms in
> series.  So  it would appear Yamaha would like to have a 3 volt supply to
> that mic.


		Agreed.    Those sets, like most computer type sets,
		prefer a voltage between 2.5 and 5 volts, typically.
		

The Orion works OK with that - I just have not gotten around to
> re-doing my mike  8 pin to 1/8 inch adapter .  SSB not very high on my
> priority list right now.


		Maybe that attenuator would help.   I could mail you
		one to try if you like... that would cost you no more
		than the postage to return it if it does not work out
		as expected.


Happy days y'all.

=========================  James - K8JHR  ====================