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Re: Mods of Drake2880 IF (Re: AO-40 this morning?)



Hi Yoshi,

Are you saying you only use one 22pF cap?

Always enjoy your reports.

73 de Bill, N4DH
Charlotte, NC

At 15:42 5/9/01 +0900, Yoshihiro Imaishi wrote:
>Hello This is Yoshi.
>
>At 2001/05/09 05:05:38 Bill Richarz wrote:
> > I made the xtal and IF mod, plus I installed the two 22pF caps.
>
>   This is a Note of it. Mr.Yoshida JI5MFZ made a deep investigation
>of Drake2880 and hold a session at our JAMSAT annual meeting last
>April about it.
>   He said that we should put 22pF caps pararel only at the input
>side of Green(Blue) IF coil (not at the IF outout side) because the
>tip-cap. of the output sode is 1000pF so there is no effect to put
>22pF at their.
>
>                Additional
>                     22pF      no need here.
>                    +--C--+      |
>                    |     |      V
>      IF input -> --*-C1--*--L---C2------ -> IF output
>                     (8p)      (1000pF)
>
>           L : Green(Blue) IF coil.
>
>   Or you can replace this C1 tip with 30pF new tip-cap.
>
>   I alos did like this. I do not have any measurement equipments so please
>somebody confirm this.
>
>   Mr. Yoshida also suggest a new style of 2880 modification. His report
>of 2880 mods will be on our next JAMSAT news letter. If possible, I will
>try to translate it in English and will put it on website.
>
>73 de Yoshi.
>
>
>Yoshihiro Imaishi JF6BCC/KH2GR
>GL:PM53JV, ex KC6IY(T88IY),V63BP
>mailto:jf6bcc@jarl.com or jf6bcc@jamsat.or.jp
><http://plaza16.mbn.or.jp/~palau/> Sorry, Japanese only now.

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