[TenTec] O II and headphones?

[Pfizenmayer]

Speaker output on O II  is MONO. So a simple dropping resistor in series 
with the speaker will reduce speaker level if needed - but none of the 
various combinations are available .

In fact I know people who use the speaker output with phones and give up
all the possible permutations of which ear hears which rx or both rx , 
binaural etc etc etc . This also solves all the problems with RF getting 
back into the headphone
IC output.  It also eliminates some kinds of screwy artifacts in the CW 
sidetone - there is a delay between the main and sub receivers so the 
monitor cw sidetone with both sub and main rx feeding the phones gets 
stretched as if the keying is "softer". If only main-main is fed to phones 
this does not occur at all and the monitor is a good replication of what is 
really being transmitted. It can be mitigated to some extent by using Main 
on one ear and Both on the other.

BUT FOR ME - the really neat thing about the totally separate headphone IC 
path is that SPOT and CW Sidetone levels are completely independent of where 
the main or sub receiver audio output levels are set and are set by a menu 
setting.  So if you have raised af gain or rf plus af gain way up to bring 
up a weak signal , when you start sending , the cw sidetone does not tear 
your head off- you alwys get the sidetone level you have preset.

Having said that I continue to beg TT to raise the CW sidetone level in OII 
to at least the same as the SPOT level - it is especially needed now that 
the headphone amp RF filter has added 24 ohms in series with the headphone 
output. At a menu setting of 100 , the SPOT tone is about 72 mv RMS and the 
CW sidetone is about 51 mv RMS open circuit -(the SPOT and CW sidetone 
levels are set by the same menu item and are not independent of each 
other )- It would be nice if SPOT and CW sidetone were BOTH settable in 
menu  but I will settle for just getting more CW sidetone level.

73 de Hank K7HP



----- Original Message ----- 
From: "Ken Brown" <ken.d.brown at hawaiiantel.net>
To: <geraldj at storm.weather.net>; "Discussion of Ten-Tec Equipment"
<tentec at contesting.com>
Sent: Wednesday, September 05, 2007 11:59 AM
Subject: Re: [TenTec] O II and headphones?


>
>>
>>
>> Is there some other reason for the complexity, audio products that can
>> be fed to the headphones but not to the speaker, such as transmit audio
>> monitor?
>>
> How about the fact that there are two receivers with various  left ear /
> right ear audio feed options. I don't have an Orion, so I'm only
> guessing on this, but there may also be various options for what (and in
> what proportions) comes out of the speaker. If you just did the simple
> thing that has worked for years, that is put a resistor in series with
> the headphone jack, fed by the same audio PA that feeds the speaker, you
> would have to use two audio PAs (and two speaker outputs), and whatever
> you selected for the speakers would have to be the same for the
> headphones.
>
> DE N6KB
>
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