[R-1051] audio/speaker

[paul swed]

The radios were intended to drive a 600 ohm balanced distribution system.
The headphones were higher impedance from what I recall aboard the
ship. Far to many years ago. A semi- better match for the headphones would
be the 32 ohm units typically available for small mp3 players these days.
Just look for the impedance.

Back to the 600 ohms. Line outs were 1 mw levels approximately. That said
pretty much any amplifier will bring the audio to very fine levels.
Examples traditional $5 stereo amps found at flea markets or the dump.
Computer speakers with amplifiers etc. I use Broadcast grade balanced
wohler amp2 speaker amps only because it was free and has some nice
features. 2 RU tall etc

>From the line outs you could literally pick any two lines for the audio. I
glanced at the schematic its a full isolated transformer out. You could
grab any two pins and the audio would be fine since the amplifier you most
likely will obtain has a far higher input impedance. However you do want to
be consistent in the two pins you pick for both outputs otherwise you may
get a phase reversal in independent sideband. Not that it much matters.

Regards
Paul
WB8TSL/1














On Sun, Dec 1, 2013 at 8:17 AM, Steve Hobensack
<stevehobensack at hotmail.com>wrote:

> Lee,
>
>
>
> All you need is a pair of small 12v filament transformers, one for the lsb
> output and the other for the usb output. Hook the 120v side to the radio
> and the 12 volt side to the (8 or 4 or 16 ohms impedance) speaker. The
> result is louder audio.
>
>
>
> Steve N8YE
>
>
> > From: vk5abc at adam.com.au
> > To: r-1051 at mailman.qth.net
> > Date: Sun, 1 Dec 2013 20:06:53 +1030
> > Subject: [R-1051] audio/speaker
> >
> >
> > Hello All
> >
> > After a long while I started playing around with my R-1051F/urr , at
> present
> > all I have are some headphones H250/??
> > I noticed the output was not very loud, then I looked at the specs, and
> > realized the output even for the speaker
> > Is only 60mw. So here comes my question. What do you folks use in way of
> > amplifier and speaker with the R-1051.
> >
> >
> > 73's Lee
> >
> >
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