[MRCA] ARC-2 findings, cont'd

jeepp jeepp at comcast.net
Sun Dec 3 19:34:07 EST 2017


    
Well, the ARC-2 was buttoned up late today.  Modulation up to 70% with removal of audio limiter (12H6).  Added dial light with clear bulb closer to dial assy. as red ones don't do anything.  Added 1000pf antenna loading.  This jibbes with the manual graph for 4Mhz. which indicates this value.  Really p[oor selectivity remedied via adding an un-terminated tickler coil in/around the 3rd and 4th IF amp tube sockets, brought out via an RG-188 min. coax.  Coupled to R-390A tuned to 1285 kHz, 3885 is excellent now.  External receiver has to be tuned/tracked with the tunable IF in the ARC-2.  Cumbersome, but it works perfectly.  Next phase is to try it again on the OMRN net. Jeep K3HVG


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