[ARC5] RBB-6 Bring-Up

[Robert Downs]

It sounds like the detent mechanism needs adjusting.  Before doing anything else, disconnect the antenna, power and audio connectors and pull the chassis out of the case.  Look behind the panel at the detent mechanism.  If it is the long oval shape or type with radiused mounting slots, set the bandswitch to one of the three lower bands and loosen the two mounting screws.  Rig up something that will allow you to rotate the detent mechanism without having your hands buried in the set.  Reconnect the two cables and turn on the set.  Rotate the detent mech in the same direction that you had to “lean into” the bandswitch knob.  The radio should come alive.  Continue rotating the mech until either the receiver stops working again or you run out of adjustment.  Move the mech back one-half of the distance or degrees that you just moved it and re-tighten the screws.  Confirm that the receiver still works on all bands.  Assuming that it does, put the chassis back in the case and connect the cables.

 

Robert Downs

 

From: arc5-bounces at mailman.qth.net [mailto:arc5-bounces at mailman.qth.net] On Behalf Of Mark K3MSB
Sent: Tuesday, March 19, 2019 19:22
To: ARC5; List Milsurplus
Subject: Re: [ARC5] RBB-6 Bring-Up

 

It's alive!   It works!    Receives AM, SSB, and CW on all 4 bands.   The controls are a bit scratchy, but some DeOxit should help that.

 

The biggest issue is that on the 3 lower bands,  I have to nudge the band switch off the detent for it to receive.    Band 4 (covering 80) is fine.   The band switch then moves back and no signal.

 

I didn't see anything in the manual about this.   I'm thinking that I'm going to have to remove the individual units in the RF section for cleaning and alignment?

 

73 Mark K3MSB

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