4/9/2023 0 Comments Sp 600 hammarlund![]() First, the bias applied to pin 5 of V14, the AGC detector, causes the There are three problem areas I wanted to address with the AGC changes. Is best to start with the AGC modifications, because both the S-meter and Have to know enough about your particular model to make your own decisionsĪbout the best way to incorporate each particular change. Since this will not be a “cookbook” set of instructions, you will If you are working with a later model receiver. ![]() Modifications are for an SP-600 JX1, so there may be minor circuit differences Wire for ease of identification by any future restorer. New wiring was done with a single color of easily recognizable modern SP-600 and left all original wiring in place. ![]() Making the following modifications, I removed as little as possible from the RF signal level meter is very non-linear and is not calibrated withĪGC employs a large amount of delay, which is partially responsible forĭetection with the existing circuitry is very poor, and the existing AGC Point where they could be easily reversible if some future custodian of theĪreas where I feel the SP-600 needs help are the following: ![]() My goal was to minimize the impact of the changes to the SP-600 to the Following modifications were produced in order to improve what the authorįeels are several shortcomings in the SP-600 receiver. ![]()
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