Aligning an RCA X551

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Aligning an RCA X551

Post by frank1956 on Thu Sep 25, 2014 12:31 pm

Since I have my signal generator (EICO 324) back up an running I am going to attempt to align this RCA X551. I was in the process of doing this and my signal generator stopped working, but anyway I got step's 1 & 2 figured out. Step 3 call's for generator to be set to 1620 KC and to tune the radio Min cap??? Is this the middle of the dail about 12:00 o'clock position?? Any help would be appreciated. Thanks

Frank
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Re: Aligning an RCA X551

Post by CrazyCanuck on Thu Sep 25, 2014 1:07 pm

Minimum capacity is when the plates are as fully unmeshed as possible, which should also be the highest frequency rec'd on that band.  Maximum capacity is when the plates  are fully meshed. It sounds like the max frequency that set is spec'd for is 1620kc.

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Re: Aligning an RCA X551

Post by Wildcat445 on Thu Sep 25, 2014 1:37 pm

Frank, an easy way I have found to do this.  It is impossible for me to know where 1620 is on my radio tuner.  I set the signal generator to 1620 khz, with the tuner to the minimum capacity end (explained well above) rotate the tuner until I hear the tone, then adjust the oscillator trimmer for max output on the VTVM, connected across the voice coil.  Then set the generator to 1400, do the same.  Then they want you to do the same at 600 on the low end.  I rock the tuner back and forth after I get done to make sure it is peaked and not tuning too broadly.  Then it says to repeat steps 3, 4, and 5.  

In fairness, I should add that I seldom do an oscillator alignment unless I am having a specific problem. I find it easy to cause more harm than good attempting to align that part.

WC

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Re: Aligning an RCA X551

Post by frank1956 on Thu Sep 25, 2014 5:30 pm

WC, Crazy thanks. Now I know next time I see Min Cap.
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