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

[jeremy-ca]

.01 is for audio coupling, it is WAY too high at any commonly used Heath IF.
A value of 1 to 10pf or so is more in line with what is needed.

Carl
KM1H


----- Original Message ----- 
From: "Peter Markavage" <manualman at juno.com>
To: <heathkit at mailman.qth.net>
Sent: Tuesday, December 11, 2007 5:38 PM
Subject: Re: [Heathkit] SB-610 scope to SB-303 receiver


> Use the lowest value that will give you a decent viewing scope trace. The
> higher the value, the more chance you're load down the IF stage. Note:
> the IF frequency of the SB-310 should match the frequency coil setup in
> the SB-610. I.0 mfd sounds way too high. I wouldn't go any higher then
> .01 mfd.
> 
> Pete, wa2cwa
> 
> On Tue, 11 Dec 2007 15:46:11 -0500 "Dan Pividal"
> <dpividal at tampabay.rr.com> writes:
>> 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 
>> 
>> 
>> 
>