The only thing the SB-230 needs to switch to transmit is to ground the
center terminal of the RCA connector on the back. Now with the K3S you
will need to provide an Amp Interface such as the Ameritron ARB-704.
The switching rating of the K3S Amp Key circuit is not rated for the
voltage
The unmodified SB-230 used -130 V to switch the relay. Clearly a buffer
relay or interface circuit is required to use that amplifier with the
K3, or any "modern" transceiver.
Scott K9MA
On 12/1/2018 16:54, Don Wilhelm wrote:
Ray,
That relay power is normally provided by the amplifier -
Ray,
That relay power is normally provided by the amplifier - you do not need
any voltage from the transceiver unless there is some strange and
unusual circuit involved.
Measure the voltage at the "PTT" or "KEYIN" jack of the amplifier. Is
it AC or is it DC? If AC, it will not work with
No. There is no power source in the ACC connector from the K3. Your use of the
12V connector is the right solution.
Jack, W6FB
> On Nov 30, 2018, at 7:02 AM, Raymond wrote:
>
> I am using my ancient Heathkit SB 230 (original tube) with my K3s. Is there a
> way to get 12 volts out of acc
How many Amps does it draw? The external port can supply 1 AMP. The P3
between .5 and .75 A. (Depending on SVGA & TX-MON installed). If you don’t need
more than .250 or so you can use a simple RCA>RCA/RCA splitter.
Sent from my iPhone
...nr4c. bill
> On Nov 30, 2018, at 10:02 AM, Raymond
I am using my ancient Heathkit SB 230 (original tube) with my K3s. Is there a
way to get 12 volts out of acc connector to power relay? Using K3 external
plug for P3 power.
Ray
W8LYJ
Sent from my iPhone
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