President Grant,Clarifier slide

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DIRTY HARRY
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President Grant,Clarifier slide

Postby DIRTY HARRY » Thursday 12th Feb 2009, 11:15

Hi guys :D ,just done the regular mod on my Grant with the PC-999 board for 3Khz of slide as stated in the info of this mod on the net,does anybody know if or how to increase the amount of slide,Cheers,Shaun :D

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Animal
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Re: President Grant,Clarifier slide

Postby Animal » Friday 13th Apr 2012, 6:45

This reply is obviously a bit late but may help someone else. :doh:

Try adding a 5.6uH coil in series to 0v end of the varactor diodes :idea:
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Re: President Grant,Clarifier slide

Postby zodiac » Saturday 14th Apr 2012, 13:12

Animal,
You forgot to mention the two varactor diodes D40 and D44 that need changing to ITT410 or same as.
You may find that a 4.7uh coil will do the same job as a 5.6uh.
How far is it.
Twice it's length from halfway.

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Animal
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Re: President Grant,Clarifier slide

Postby Animal » Sunday 15th Apr 2012, 7:07

Quite correct Dave - glad you're paying attention at the back! =D>

You'll find that the extra inductance will also give you more downward shift than up & you'll need to reset the VCO offsets (& probably find that you can't align it correctly with the Coarse control in the center notch position!)

Time to get the hammer out & flatten that detent! :twisted:
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Re: President Grant,Clarifier slide

Postby zodiac » Monday 16th Apr 2012, 5:22

Do you want to lend one of my hammers :lol:
How far is it.

Twice it's length from halfway.

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Re: President Grant,Clarifier slide

Postby Animal » Monday 16th Apr 2012, 7:33

Hammer sorted - just need the anvil! :wink:

Did you ever manage to perfect that mod for 5kc steps on the Grant by the way - seemed like much better idea than fiddling around with the clarifier & a frequency counter to get the zero's :idea:
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zodiac
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Re: President Grant,Clarifier slide

Postby zodiac » Monday 16th Apr 2012, 12:14

I now use PIC's instead of an Eprom for that mod, it only needs a 2 pole switch instead of 4 poles with the Eprom.
I've got two Jumbos I'm doing at present with MK2 Cobra 148GTL DX radios being fitted with the 3900 counters and zero switching using a PIC.
Did one the same last year with a 3900 in and sold it for £270.
How far is it.

Twice it's length from halfway.

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Re: President Grant,Clarifier slide

Postby harry045 » Monday 13th May 2013, 18:57

Animal,
You forgot to mention the two varactor diodes D40 and D44 that need changing to ITT410 or same as.
You may find that a 4.7uh coil will do the same job as a 5.6uh.
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