[amsat-bb] Re: 910/KJ6KO AMP

Stan W1LE stanw1le at verizon.net
Fri Jun 12 20:16:03 PDT 2009

Hello Bob,  

Time for a sequencer. IC-910H can not handle all of the current needed 
for the transfer
relays,  nor the 28 VDC for these relays.

Sequencers are made by DEMI, JWM Engineering, ARRL Handbook has them, 
ARR makes 'em.

Grab the MIC PTT line before it gets to the IC-910H, feed it to the 
sequencer input.
Sequencer output #1 supplies DC power to the mast mounted preamplifier.
Sequencer output #2 drives the PA PTT input
(Sequencer output #3 drives the IPA or transverter PTT input) you do not 
Sequencer #4 output drives the transceiver PTT input on the MIC connector.
Feed the MIKE audio directly into the mike connector
The DEMI sequencer has isolated relay output contacts with decent 
ampacity ~ 2A
use to switch the 28 VDC to the PA bypass relays.

My sequencer is in a separate diecast box.

You are at the point where the IC-910H alone, can not do what you want, 
safely and reliably.

Depending on the size of the coaxial RF relays, a DEMI (RVD) relay 
voltage doubler may be appropriate.
Takes in 12 VDC and will toggle a 28 VDC coaxial relay with PTT control.

Stan, W1LE    Cape Cod    FN41sr

w7lrd at comcast.net wrote:
> Hello 
> Before I do something stupid.  I need to know a good way of using my 910 to switch a KJ6KO amp.  In my application I am using a series of external relays to "switch around" the  amp for 1296 receive.  The Acc socket pin 3 seems to have a low voltage on it.  I will be switching a couple of 28V relays as well a switching on the amp.  Has anyone been here? 
> 73 Bob W7LRD 
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