[TenTec] rick's recalcitrant 515

[Lee]

Steve, the mixer has a balance trim pot.  Maybe someone was trouble 
shooting a problem on 80 M and when he "tweaked" to pot the radio came 
alive.  I imagine with significant unbalance and with the gain of the 
mixer there would be enough 5Mhz drive.....maybe.   :-)    I'm anxious 
to hear what Rick finds but it may be a little while before that busy 
chap can get to it.

73,

-Lee-


------ Original Message ------
From: "Steve Hunt" <steve at karinya.net>
To: "Discussion of Ten-Tec Equipment" <tentec at contesting.com>
Sent: 9/6/2016 2:01:36 PM
Subject: Re: [TenTec] rick's recalcitrant 515

>Rick,
>
>That was the only option I could come up with that met the observed 
>symptoms!
>
>However, I dismissed it because I didn't think enough of the 
>5MHz-5.5MHz PTO signal would make it through the MC1496 PTO/XTAL 
>balanced mixer to provide a viable local oscillator. On 20m - when they 
>use the PTO signal directly for the Local Oscillator - they switch it 
>directly to the LO buffer, completely bypassing the MC1496.
>
>It'll be interesting to hear if the rig does tune "the wrong way" - 
>that would be further evidence that the LO is wrong. A quick check if 
>you hear CW signals at the 'phone end of 80m and vice-versa might 
>confirm it.
>
>73,
>Steve G3TXQ
>
>
>On 06/09/2016 06:33, rick at dj0ip.de wrote:
>>THIS MAKES SENSE!  It is the only plausible thing that can be going on
>>because from the logic standpoint, everything is switching as it 
>>should.
>>That will be an easy fix, once I can make time, clean the workbench to 
>>make
>>room, etc.
>>
>>73 - Rick, DJ0IP
>>(Nr. Frankfurt, Germany)
>>
>>
>>
>
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