[TenTec] ARGONAUT 515 problem

[Carl Moreschi]

Rick,  I think this is normal.  The mixing scheme works such that LSB 
comes out as normal on 80 meters.  I seem to recall that my Omni A 
worked the same way.  I think they use the same crystal for 20 and 80 
meters to get to the IF and this yields USB on 20 meters and LSB on 80 
meters.

Carl Moreschi N4PY
58 Hogwood Rd
Louisburg, NC 27549
www.n4py.com

On 9/4/2016 10:51 PM, rick at dj0ip.de wrote:
> Meanwhile, back at Ten-Tec . . .
>
>
>
> I have just received an Argonaut 515 in fairly good shape, just needing a
> tune-up.
>
> However it does have one minor issue which has me stumped.
>
>
>
> On 80m I could hear lots of strong signals but all sounding like Donald
> Duck.
>
> I switched to SB-R which should normally place the rig in USB mode and
> everything worked just fine.
>
> On 40m, and all other bands, I switch back to SB-N and everything is fine.
>
>
>
> I haven't checked transmit yet to see if the wrong mode is only selected in
> RX or if it is also during TX.
>
>
>
> What is curious to me is, the mode switch is labeled for SB-Normal and
> SB-Reverse, yet the signal input to the SSB generator board for switching
> these is simply called LSB.
>
>
>
> What I am unable to find is how the position of the bandswitch can pass a
> signal through the mode switch to tell it when to enable or disable this LSB
> line.  That must be the source of the problem.
>
>
>
> I believe  this is very similar to the Triton IV so perhaps someone with
> that radio understands how this works.
>
>
>
> Tnx.
>
>
>
> 73
>
> Rick, DJ0IP
>
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