[Amps] How to connect the SB-220 to a Kenwood TS-530 and TS-930

Rich 2@vc.net
Fri, 6 Dec 2002 09:30:08 -0800


good idea.  100 to 200 ohms will do the feat.

>One further suggestion: there is a .01 capacitor on the amplifier's keying
>line, right at the phono jack on the rear panel.  This causes a high current
>pulse through the transceiver's relay contacts.  I suggest that if you put
>the resistor in series with this line (as Pete appropriately suggested) that
>you move that capacitor so it is on the amplifier end of the resistor and
>not on the transceiver end.
>
>Mike N4NT
>
>----- Original Message -----
>From: "Pete Smith" <n4zr@contesting.com>
>To: "JULIO C ROSA" <kapyd@juno.com>; <amps@contesting.com>
>Sent: Friday, December 06, 2002 7:36 AM
>Subject: Re: [Amps] How to connect the SB-220 to a Kenwood TS-530 and TS-930
>
>
>> At 12:39 AM 12/6/02 -0500, JULIO C ROSA wrote:
>> >Hello!
>> >Can someone please describe to me how is the connection made from the
>> >Heath SB-220 to the Kenwood TS-530 (with TUBES finals ) and TS-930 (Solid
>> >State ).
>> >    As far as the RF cable connection I see no problem there, but am not
>> >really sure on how to go about making the ALC and the relay connections
>> >to either one of the transceivers. I rather wait until I get a sure thing
>> >info. I would also like to know if it will be safe to use the TS-530 with
>> >the SB-220. I realize that to use it with the TS-930, first I would have
>> >to do an upgrade on the SB-220 relay.
>> >  Thank you so very much for your information! Happy Holidays and best
>> >regards !
>> >
>>
>> Hi, Julio.
>>
>> The relay in the SB-220 is 110 VDC, a number that is too high for the
>> solid-state switching in many modern transceivers.  However, I used an
>> unmodified SB-220 with a TS-930 for several years.  The SB-220 relay is
>> connected to pin 7 of the Remote jack.  The relay that controls that pin
>> must first be enabled by moving a jumper on the relay board inside the
>> radio near the power amplifier section (my memory isn't clear on this, but
>> I think it is under the bottom cover.  This is explained on page 32 of the
>> English-language manual, in figs 6-3 and 6-4.
>>
>> At a friend's suggestion, I also used a 220 ohm, 1/2 watt resistor is
>> series with the relay line, to limit the current through the relay.  All
>> this worked fine.
>>
>> I would not be surprised if the TS-530 had a similar connection, and could
>> be used with the SB-220 in the same way.
>>
>> This is not to say that the SB-220 relay isn't a weakness of the unit --
>it
>> switches too slowly for many modern transceivers, and that may result in
>> hot switching that will eventually cause the relay to stock.  Modification
>> to incorporate a vacuum relay (as described on AG6K's web page) is not a
>> bad idea.
>>
>> I have never used the ALC connection, and see no need to.  As long as you
>> adjust the exciter so that its internal ALC indicates properly, neither of
>> these radios is likely to drive the SB-220 hard enough to cause a problem.
>>
>>
>> 73, Pete N4ZR
>> Sometimes a tower is just a tower
>
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-  Rich..., 805.386.3734, www.vcnet.com/measures.