A couple more questions...

[Ronald D Rossi]

>>>"Ogborn, Roy W" said:
> 2) The 20amp Astron power supply is rated at 16 amp continuous, 50% duty
> cycle, 20amp CUI(?).  The OMNI D manual states it draws a max of 18.5

I use a TT PS and with max power I see VERY near 20A. For digital I would back 
off a bit.

> 
> 3) The OMNI calls for a high impedance mic to be connected.  What
> happens if I connect a low impedance (600 ohm) mic to the jack?

I have hooked a variety of mics up to my D. I now have a pre amp in line with 
all of them. TT said that the internal amp was plenty, but I did not find that 
to be the case except with electret mics (internally amplified already). I run 
with about a gain of 60 and the drive set at about 09:00 (15 meters is about 
10:30 and 10 meters requires nearly 13:30) using a Radio Shack dynamic mic as 
well as the dynamic on my Telex headset. I do terminate the the line to match 
the op amp output impedance and reduce the noise pick up on the cable.

I am using a National Semiconductor mic pream op amp. It has at least 60dB of 
power supply ripple rejection build in...nice chip. I just looked at their web 
site and it doesn't look like they offer it anymore :(.

-- 
73 de KK1L ex N1PBT...ron (rrossi@btv.ibm.com) <><
Ron Rossi H/P SRAM Engineering -- IBM Microelectronics



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