[Kenwood] Question about DSP connections on TS-450/690

Sun Oct 31 22:32:13 EDT 2010

Since no-one listens I give up.

Clif Holland KA5IPF
www.avvid.com

----- Original Message ----- 
From: "Rob Atkinson" <robk5uj at gmail.com>
To: "Michael G. Carper" <mike at wa9pie.net>
Cc: "Clif Holland" <clif at avvid.com>; <kenwood at mailman.qth.net>
Sent: Sunday, October 31, 2010 9:26 PM
Subject: Re: [Kenwood] Question about DSP connections on TS-450/690

> get a service manual so you can figure out the product detector and find 
> out
> where it is in the rig.   drill a hole in the back panel and install an 
> RCA
> phono jack.  run a shielded unbalanced two conductor audio cable from the
> jack over to the p.d. area.  ground the shield at the jack collar and on 
> the
> pc ground on the p.d. board (this may solve your pin one problem if you 
> have
> that issue).  put a cap in series with the audio cable center, try 0.1 uF 
> to
> begin with.  because the rig is solid state the cap can be 25 or 50 v.
> with an audio amp on, driving a speaker (you'll need one that has a preamp
> in it) and connected to the rear panel jack, probe around with the other 
> end
> of the cap until you find the best pickoff for the p.d. audio and tack
> solder it on.   You'll be amazed at how good it will sound with all the
> stock base band audio circuitry in the rig bypassed.   If you use some 
> sort
> of wide passband filter it will sound even better.
> Try picking up an old push pull vacuum tube amp--you can find these mono
> p.p. little 12 watt 6BQ5 amps on eBay or at hamfest flea markets and they
> will drive a big 3 way speaker cabinet  with no problem.  All you usually
> need to do is recap them--pull out the electrolytics and plastic paper 
> caps
> and replace them with new lytics and Vishay poly-films.  Back in the 1950s
> heathkit sold a bunch of them, models EA-2 and EA-3; they have 12AX7
> preamps, ideal for product detector audio and you get this warm tubey boat
> anchor sound out of your solid state Kbox.  If this DSP2 thing Cliff
> mentioned is direct from the p.d. (I don't know what the low pass filter
> does) then you may not even need to drill any holes.   Or, there may be 
> some
> unused by you connector you can hijack for this purpose.
>
> 73
>
> rob
> K5UJ
>
>
> On Sun, Oct 31, 2010 at 4:24 PM, Michael G. Carper <mike at wa9pie.net> 
> wrote:
>
>> I've been looking at the DSP-100 Service Manual.  It shows the connection
>> from the transceiver's DSP3 as:
>>
>> Pin 1   Audio input
>> Pin 2   GND
>> Pin 3   Audio output
>> Pin 4   GND
>> Pin 5   DSP connect signal
>> Pin 6   FSK keyer
>> Pin 7   CW keying signal
>> Pin 8   GND
>> Pin 9   Reference signal (10kHz or 10MHz)
>> Pin 10  GND
>> Pin 11  Mic input
>> Pin 12  Mic GND
>> Pin 13  Transmission control
>>
>> Then it shows DSP2 as Receive IF; DSP1 as Transmit IF.
>>
>> Assuming that the pin 1 reference for the DSP3 connection is from the
>> perspective of the DSP-100, I'm inclined to believe that this is audio
>> output from the transceiver.  Seem reasonable?  (I'm looking for the 
>> TS-690
>> service manual to see if it's shown there.)
>>
>> Mike, WA9PIE
>>
>> -----Original Message-----
>> From: Clif [mailto:avvidclif at wildblue.net] On Behalf Of Clif Holland
>> Sent: Sunday, October 31, 2010 12:31 PM
>> To: Michael G. Carper; kenwood at Mailman.qth.net
>> Subject: Re: [Kenwood] Question about DSP connections on TS-450/690
>>
>> Have you looked at the service manual?
>>
>> DSP2 comes off the product detector and thru a LPF and out.
>>
>> Clif Holland KA5IPF
>> www.avvid.com
>>
>>
>>
>>
>> ----- Original Message -----
>> From: "Michael G. Carper" <mike at wa9pie.net>
>> To: "'Clif Holland'" <clif at avvid.com>; <kenwood at Mailman.qth.net>
>> Sent: Sunday, October 31, 2010 8:45 AM
>> Subject: RE: [Kenwood] Question about DSP connections on TS-450/690
>>
>>
>> > Yep, I've been all over the p22 scenario.
>> >
>> > Page 22 identifies the external speaker jack (which is amplified) and 
>> > the
>> > ACC2 connections (which include an unamplified audio out).  However, my
>> > ACC2
>> > jack is occupied by my MicroKEYER II (and I wish it had an unamplified
>> > audio
>> > out).  [When I say 'unamplified', I'm really referring to line-level
>> audio
>> > output.  The audio amplifier used in most of these radios has a rather
>> > high
>> > S/D ratio.  So I don't want to amplify the distortion of the signal. 
>> > I'd
>> > rather get a line-level signal that I can amplify with a very clean 
>> > audio
>> > amplifier into some very clean speakers.]
>> >
>> > I've gotta believe that there's a line-level audio signal at one of 
>> > these
>> > DSP connectors.
>> >
>> > Mike, WA9PIE
>> >
>> > -----Original Message-----
>> > From: Clif [mailto:avvidclif at wildblue.net] On Behalf Of Clif Holland
>> > Sent: Sunday, October 31, 2010 1:45 AM
>> > To: Michael G. Carper; kenwood at Mailman.qth.net
>> > Subject: Re: [Kenwood] Question about DSP connections on TS-450/690
>> >
>> > Read PG 22 of the owners manual.
>> >
>> > Clif Holland KA5IPF
>> > www.avvid.com
>> >
>> >
>> >
>> >
>> > ----- Original Message -----
>> > From: "Michael G. Carper" <mike at wa9pie.net>
>> > To: <kenwood at Mailman.qth.net>
>> > Sent: Saturday, October 30, 2010 11:29 PM
>> > Subject: [Kenwood] Question about DSP connections on TS-450/690
>> >
>> >
>> >>I don't use these DSP connections on the back of my TS-690 because I
>> don't
>> >> have the DSP-100.  However.
>> >>
>> >>
>> >>
>> >> If any of these connections provide an unamplified audio signal, I'm
>> very
>> >> interested in connecting it to a very clean (studio quality) audio
>> >> amplifier
>> >> and speakers.  (I'm getting a bit tired of listening to the audio
>> through
>> >> a
>> >> $2 speaker in a $73 Kenwood case.)
>> >>
>> >>
>> >>
>> >> Does anyone have the pin-out diagrams for DSP1, DSP2, and DSP3?
>> >>
>> >>
>> >>
>> >> Mike, WA9PIE
>> >>
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>>
>>
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> 