Hi gang
My problem is that the yig output power varies from approx 2db to 12 db over its frequency range and at one point in the range it stops altogether and puts out about 2 db again but at two different frequencies
The nominal output of the yig is supposed to be 14 db
The aux output on the rear of the 83592a is supposed to be 0 db but mine is 10 db?
The yig power was measured directly out of the yig btw
This problem manifested itself as uncontrolled max output power which is normally associated with the A4 card or the agc loop but after weeks of searching and probing including a complete set of replacement plug in cards i am no further ahead other than the low power output if the yig
Maybe the agc is turning the wick up to compensate for the low yig output , maybe i have two faults but if and when i replace the yig i will know
Any suggestions welcome
From Ken Goodhew
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On 14 Sep 2020, at 1:26 pm, Harvey White <madyn@...> wrote:
?However, I've heard the term used in oscillators, where the oscillator puts out a damped sinewave rather than a continuous one. Feedback situation or bad voltages for that situation.
Harvey
On 9/13/2020 11:11 PM, Don Bitters via groups.io wrote:
The term is ¡°squegging¡±. The YIG actually switches modes, causing it to put more power into side bands than the fundamental frequency. You will see the fundamental dip in voltage/power and sometimes see some frequency ¡°pull¡±. Adjusting the bias to reduce the ¡°squegging¡± will generally solve the problem. On a weak YIG you may not be able to get the needed YIG power out and not have ¡°squegging¡±. Then it is just a matter of doing your best to have no ¡°squegging¡± and the best achievable power out - even if not up to the max spec¡¯d output. Otherwise you will have to replace the YIG.
Squegging is unique to YIG¡¯s.
Don Bitters
