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 CO2KK
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@enet.cu To: amsat-bb@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 CO2KK _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (2)
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George Henry -
Prof. Arnaldo Coro Antich