My 705 schematic shows pin 4 and the + terminal of the battery each feeding
through respective steering diodes (1n4148), then directly to pin 14 of the
14013 (a CMOS Dual D type Flip-Flop). CMOS typically works across 3 to 15
volts. After the .7 volt hit through the steering diode, any 4.5v source would
be very close to the hairy edge. I'm betting it's better than 4.5 volts across
pins 2 and 4 of the Pegasus mic jack--more along the lines of 9+ volts....the
Omni VI derives it through a 470 ohm resistor from +REG (13.8v?).
Someone, please, measure the Pegasus pin 2/pin4 voltage. Settle this issue.
73,
dale, kg5u
-----Original Message-----
From: JEFF S JOHNSON <aa8ve@juno.com>
To: tentec@contesting.com <tentec@contesting.com>
To: <tentec@contesting.com>
Date: Thursday, December 09, 1999 15:35 PM
Subject: Re: [TenTec] RF & Pegasus
>
>I checked my Omni-V and the output for the mic is 8.6 volts. I wonder
>why they now supply only 4.5 volts? Is anyone running a 705 off the
>Pegasus with any problems? Perhaps 4.5 is enough to run the 705 from
>anyway. What is the voltage out in the mic jack on an Omni-VI anyway?
>
>73 Jeff aa8ve
>
>On Thu, 9 Dec 1999 13:22:19 -0400 (AST) David McClafferty
><at060@chebucto.ns.ca> writes:
>>
>>
>>
>> On Thu, 9 Dec 1999, JEFF S JOHNSON wrote:
>>
>> >
>> > I should hope Pegasus has DC voltage out for the Mic. so a battery
>> is not
>> > needed.
>> >
>>
>> I did not have a battery in my 705 when I used it with the Omni V.
>> When I
>> got the Pegasus the LED on the 705 base would only glow very dimly
>> and
>> the rig was obviously not being fully modulated, so I had to put a
>> battery
>> in. The manual says it provides 4.5 Volts for electret mics.
>> Appearently
>> that not enough for the 705. I hope that we will get schematics
>> someday so
>> one could look into modifying such things. I hate batteries, they
>> leak and
>> ruin a lot of good gear.
>>
>> 73, Dave, VE1ADH
>
>
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