[ARC5] RBB-6 Bring-Up

[Mark K3MSB]

Dave, Robert

Thanks for your comments!   Tonight I will characterize the amount of twist
I need on the 3 bands before I go mucking around inside the radio.

Robert --  Attached is a photo of the back of the band switch shaft;  it
does not look like anything you describe (or maybe I’m not interpreting
your email correctly?)   The 4 sided shaft is locked into the front
coupler,  so I do not see how loosening the rear nut/screw will let you
turn the shaft for alignment.

I am pondering (this is always bad…..) taking out the band switch and
opening up the units in the RF section just to do it.  Perhaps the switch
contacts inside need cleaned?   The others in the radio were pretty clean
to begin with.

Steam Punk Meters?? – You’re right Dave – seeing all 3 of those meters
swinging last night was great!  Well the 200V meter wasn't swinging but you
know what I mean.  While watching the meters I was listening on 3885 and
the AM sounded really great!

73 Mark K3MSB

On Wed, Mar 20, 2019 at 1:29 AM Robert Downs via ARC5 <arc5 at mailman.qth.net>
wrote:

> 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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