[amsat-bb] Re: KLM polarity switch schematic

18 Oct 2008


      Hi Angelo And Dave
Over the +12 volt DC connector there is a 1000 pF disk capacitor connected from the center of DC connector to the ground on PCB 
In addition I have added a diode IN4007 to protect the relay winding from the high voltages developing across the coil during circuit openings.
The katode of the diode must be connected to the central pin of the DC connector while the anode is connected to the ground on PCB
73" de
i8CVS Domenico
  ----- Original Message ----- 
  From: Angelo Friend 
  To: i8cvs ; Angelo Friend ; AMSAT-BB 
  Cc: dguimon1@san.rr.com 
  Sent: Saturday, October 18, 2008 7:23 PM
  Subject: Re: [amsat-bb] KLM polarity switch schematic
Hi Domenico and Dave,
Thanks for the pics and the help . They helped a lot. The other question I have is that there is 3 componets on the power connector and one on the ground side of the
  boom screw.  I cant tell what they are. I have two on the power connector and nothing on the ground pin. I know they need to be changed. Can you help with this??
Thanks
Angelo
----- Original Message -----
    From: i8cvs 
    To: "Angelo Friend" , "AMSAT-BB" 
    Subject: Re: [amsat-bb] KLM polarity switch schematic
    Date: Fri, 17 Oct 2008 22:44:19 +0200
Hi Angelo,
In a separate email I have sent to you 3 enlarged pictures of the PCB
    for the KLM polarity switcher.
Please note that the holes from one side to the other side of the PCB
    are metallized.
When soldering the new relay do not use a too high temperature for the
    soldering iron otherwise the studs of relay becames oxidated (blue color)
If possible use solder from ALPHA METALS INC with 62 Sn, 36 PB and
    2 Ag
73" de
i8CVS Domenico
----- Original Message -----
    From: "Angelo Friend" 
    To: 
    Sent: Friday, October 17, 2008 1:59 PM
    Subject: [amsat-bb] KLM polarity switch schematic
> I just took down my polarity switch for my 2 meter KLM and I need to do
    > some work with it. I just receivedthe new relay to install but I may have
    > damaged a trace or two. So anyone have pictures (without reply
    > installed) or schematic of the board itself??? Thanks in advance. 73 de
    > Angelo
    >
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