[TenTec] proper caps for Omni V?

[Joe Roberts]

My sense is that it is best to identify the caps one by one.

There aren't really that many different values and some are more 
involved with digital noise bypass then others, so there are application 
specific considerations.

For example, the 4.7 uf in the voltage multipler on the display 
board...these can be good general purpose caps if that's all you can 
get, while the bypass and decoupling on the logic board should be low 
ESR types of the highest specification you can muster.

You can get far with a bag of 1uF, ten 10 uF, a half-dozen 100 uF and a 
couple 220uf. Unless time constants are involved (e.g. AGC and QSK caps, 
audio coupling), you can always go higher on the C if they will fit.

In a few spots, such as the 12V decoupling caps on the logic and AF 
board, high capacitance "motherboard" caps that are state of the art. 
super low ESR can be employed to good effect. Late model versions, i.e. 
fresh ones, can be found on ebay --search "motherboard cap".

Also I noted that a few of the caps appeared to be mini versions so 
mechanical particulars might come into play, depending on the size of 
the caps you obtain.

Good luck! The project is well worth the effort.

Joe N5KAT





Rick Denney wrote:
> Dr. Gerald N. Johnson writes...
> 
>> The high temperature, low esr electrolytics are
>> a pretty good capacitors and can degrade a lot more than the cheap
>> commodity miniature electrolytics and still be better than the cheap
>> capacitors were when new.
> 
> I'm bringing this thread back for a related question. I see that
> Mouser offers kits of capacitors, but not in the low-ESR, high-temp
> categories. My parts bin includes only cheap caps from RS, likely no
> better than what might be in the radio. If I wanted to recap my Omni
> V, is there an available assortment of low-ESR, high-temp caps that
> should cover most possibilities, or will I have to go through and ID
> the caps one-by-one?
> 
> Rick, KR9D
> 
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