philips: BX998A; Bi-Ampli 27MHz alignement difficulty.

I am aligning the AM bands and have difficulty at 27 MHz (11.1m) alignment point.  The 14.6MHZ alignment point adjusts in easily.  The 27 MHz (oscillator 27.452) is unobtainable.

My first question is where the Band Spread control is to be set.  Where do the instructions indicate where the Band Spread should be set?  There is a dart or pointer in the middle of the scale.  This does not work.  The minimum setting by the scale numbers does not work.  The oscillator will not reach 27.452 MHz.  I can receive WWV (20MHz, 15m) at oscillator 19.548 MHz.  

I hope my difficulty is with the Dutch to English translation and not circuit component related.  I am beginning to suspect some series capacitor being defective.  C50, C34 etc. I can minimize C40 the 27 MHz oscillator adjustment and not obtain the proper oscillator frequency.

Can any one give me any ideas to try before I start changing mica capacitors?

Thanks to all the fine experts here on the RM.org board.

 

I found the problem at 27MHz.  It was capacitor C50 210pf.  It measured good in the capacitor tester.  But I replaced it any how with the closest I had 220pf.  Now the band aligns in properly.

Paul.

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Hello Paul, I send you the pre realease off my translayion into English by mail.

 

Gr. Henk van 't Kruis

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I will keep my eyes open for your letter.

Thank you,

Paul

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