[Heathkit] SB-610 scope to SB-303 receiver

[jeremy-ca]

Well at first you said bypass and now you say coupling; there is a huge 
difference.

 Mmf is now pf;  mf is still mf.

Either the manual has a typo or you need glasses or maybe both <G>

A very low value of 1-12pf is more like it and you select a value that 
doesnt overdrive the scope. Use a trimmer if you have one and then measure 
the value that gives the best results and replace with a fixed value.

For such a short run any miniature coax is OK, RG-174, 178 and 179 are 
common ones.

Carl
KM1H

----- Original Message ----- 
From: "Dan Pividal" <dpividal at tampabay.rr.com>
To: "heathkit at mailman.qth.nt" <heathkit at mailman.qth.net>
Sent: Tuesday, December 11, 2007 3:46 PM
Subject: [Heathkit] SB-610 scope to SB-303 receiver


>I am trying real hard to hook up an SB-610 to an
> SB-303.
> If anyone has done the mod to monitor the receive envelope please let me 
> know what value of coupling capacitor you used with success.
> Seems the Heathkit SB-610 assembly manual says to use a 1.0mmf
> Also says, they supplied the 1.0mmf as well as a 2.2mmf and a 12mmf 
> capacitor in the original kit.
> I believe that long ago mmf meant Picofared.
> That would make a big difference.
> Tech notes I have from Heathkit says to use a 1.0mf coupling cap to the 
> 3rd IF via a RG174 coax to a spare RCA plug in the back of the receiver.
> To which document do I pay heed.
> Thanks in advance for any help in clearing this up.
> Dan/N4VET
>