[amsat-bb] Re: Request for help with satellite capable old rig ECHO 70 by KLM

George Henry ka3hsw at att.net
Fri Jul 20 10:05:22 PDT 2012

I used to have an Echo 70, and may still have the documentation on my home 
computer.  It is a SSB/CW rig, and if I recall correctly, the 435 segment can be 
moved  to cover the satellite band by changing a single crystal.

George, KA3HSW

----- Original Message ----
> From: Prof. Arnaldo Coro Antich <coro at enet.cu>
> To: amsat-bb at amsat.org
> Sent: Fri, July 20, 2012 11:42:17 AM
> Subject: [amsat-bb] Re: Request for help with satellite capable old rig ECHO 70 
>by KLM
> Dear amigos :
> I am new to this list. My very good friend CO6CBF Hector asked  me to make
> a comeback into the ham satellites world.
> I found an ECHO 70  KLM transceiver that was in bad shape, but that could
> be repaired. Now it is  receiving , but on transmit the power is only 1 Watt.
> The receive sensitivity  is not great, but enough for Hector to make a two
> way contact with it...  Hector has a very good 70 cms band antenna system
> that really helped.
> The  70 cms signal level at the input of the first of two output filters is
> 10  Watts, measured with professional test instruments, but after the
> filters  there is only 1 Watt.
> I suggested to Hector that he blew hot air over the  ceramic trimmers
> of the two filters in order to remove humidity ...
> It  worked on one of the filters... now there is good power output
> on the 435  megaHertz segment , but 432 megaHertz is still at the
> low power output  level.
> FYI, we are not authorized to operate on the 432 megaHertz  segment
> used by the Oscar 7 AO7 ancient satellite... but do have  permission
> to operate on the 435 megaHertz segment that other satellites  use.
> Any information about the ECHO 70 KLM transceiver that can be  found
> will be most useful, as once the rig is in good working conditions  it
> will be used frequently from my EL83td grid square location in  downtown
> Havana, and possibly by mini dx satellite expeditions to other  nearby
> grid squares too.
> If the files that contain the information about  the ECHO 70 KLM rig
> are large, please send them to:
> arnaldo.coro at gmail  dot com
> Thanks in advance for your help and hope to make many new  friends
> in my return to the amateur satellites world after many years
> of  absence * I am from the days of Oscar 7, RS 10 and RS 12 and
> RS 15 *  !!!!
> 73 and DX
> Arnie  Coro
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