You are of course right. My recollection of a fancy knob
on the 7L13 was the time/division knob, which is similar to
the time/division knobs on all of the other scopes of the
era.
I think the OP's 7L13 is typical of all 7L13's. If there is
a push/pull notation in the manual, it is probably wrong.
-Chuck Harris
Miguel Work wrote:
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If you look inside the 7l13 there are two multiturn pots, fine and coarse, mechanically connected to the tuning knob. Each pot has a electromagnet clutch. The pot engaged depends of span resolution position, or pll on/off position. For a low span the fine pot is automatically engaged, but if you switch off pll, coarse pot is engaged, so tuning knob will move more frequency. For large span coarse pot is used.
7L12 and 491 has PLL too, but the PLL in 491 isn?t automatic
Regards!
-----Mensaje original-----
De: [email protected] [mailto:[email protected]] En nombre de Attilio
Enviado el: lunes, 21 de diciembre de 2020 19:28
Para: [email protected]
Asunto: [TekScopes] Spectrum analyzer Tektronix 7L13 on mainframe Tektronix 7603
Dear Sirs,
I got hold of a 7L13 spectrum analyzer in a 7603 mainframe and I have two questions to ask you, first from the manual the tuning knob can be pushed or pulled to change the tuning speed, but on my 7L13 the tuning knob is fixed and there is only the word tuning, Do you know when this modification was made and why ?
Second question: Is it possible to extend the maximum frequency from 1.8 GHz to 2.5 GHz ?
If so, what are the changes to be made ?
Thanks a lot to everyone, a greeting
Attilio
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