[R-390] PTO

Fri Sep 3 22:11:03 EDT 2010

Nah, the only thing it can hear is my sig/gen at an absurd input level, at
7.035 and 8.035 [seemingly verifying what visual inspection told me when I
reassembled the RF deck...although that jibes with the display
indications...and some spurs at indicated 0+000 and 1+000 and a birdie at
910.  I haven't looked higher than that.

The cam alignment at 7+000 is spot-on, the rf bandswitch rolls over between
7 +000 & 8 +000 just like in the tutorial, and 7+000 equates to the 7
showing in the window on the crystal oscillator deck, and visual inspection
before reinstalling the rf deck/crystal deck assembly confirmed the contacts
were right in line.

Is it somehow possible to have the crystal oscillator bandswitch mis-indexed
to the indicator drum inside the crystal deck, without having done anything
to the crystal deck on a previously-working receiver?

By the way, I'm using a known-good, plug-and-play IF deck just received from
Fair Radio.  The known-good PnP RF deck should be here Tuesday.

Or could I have the MHz side of the...I dunno.  I need to walk away from it
for a few hours.  I'll be yanking the blankety-blank
rf deck again tomorrow.

73 de KA9EGW

-----Original Message-----
From: Craig C Heaton [mailto:wd8kdg at att.net]
Sent: Friday, September 03, 2010 8:22 PM
To: ka9egw at britewerkz.com; r-390 at mailman.qth.net
Subject: RE: [R-390] PTO

Looking back, I think this is still about an "A". So if it is get a copy of
the Y2K, print the beast and follow along.

The mechanical alignment has to be done first, check cam position at 7 +000,
etc. If the receiver can hear signals, set it for one of WWV's TX's; 5 10 15
or 20 MHz. Loosen a clamp on the PTO, keep the veeder root, cams, etc from
moving, turn PTO shaft only until WWV is zero beat. (BFO on)

This should get you in the ball park.

Craig,

-----Original Message-----
From: r-390-bounces at mailman.qth.net [mailto:r-390-bounces at mailman.qth.net]
On Behalf Of ka9egw at britewerkz.com
Sent: Friday, September 03, 2010 5:37 PM
To: r-390 at mailman.qth.net
Subject: [R-390] PTO

The saga continues...it goes without saying the rf deck is now horribly out
of alignment.  I can get the rx to hear my sig/gen on the antenna input, but
that's about it.

Lacking access to a freq counter, but having a decent sandstate general
coverage rx, [a Rat Shack DX390 which is possibly too sensitive for this
use] how do I go about telling where the pto is really at?  I've got more
than my share of intermod and spurious mixing products and can blank the
receiver 50 times when tuned through 10 turns starting at the
counterclocksise.  [When I say 'stop' I mean that point where the resistance
of the bare pto shaft to my bare fingers just starts to increase marginally,
I am being very careful not to run the pto past it's physical limits...]

Assuming I'm at the full CCW stop on the pto, where should it be?  It's a
Collins PTO FWIW.

I won't even go into my planned 'someday' change to the Cosmos I have on teh
shelf...

Any help would be appreciated.

73 de KA9EGW

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