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Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1308009
Sun Apr 21 2019 02:33 PM
Sun Apr 21 2019 02:33 PM
truckernix  Offline
Master Gabster
Joined: Mar 2002
Posts: 8,826
Bracebridge Ontario Canada
For folks like me that aren't talented enough to do many of the things that you are doing here, how did you rewind that coil?


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1308030
Sun Apr 21 2019 04:50 PM
Sun Apr 21 2019 04:50 PM
2
2ManyTrucks  Offline OP
Shop Shark
Joined: Aug 2018
Posts: 189
california
hi truckernix,
it isn't too difficult, as long as you make it look close to what it was like, it will be fine,
because later when we go through the alignment procedures any small variation in the coil winding will be calibrated out.

in the photo of the dirty coils in the vise, the center outer portion is dropped down a bit, and touching it i could see it was sloppy loose which is no good on rough roads
to the listener a weak station could have loudness variations with truck motion as this coil giggles, but it would likely not move enough in one instance to notice,
really it just needed to be fixed on principle smile

the circuit of what this coil does is attached as well - the two halves are for the variable oscillator that modulate the selected band to the IF frequency.
the oscillator must be able to span frequency ranges of (535KHx - 262Khz) to (1605KHz - 262KHz), that's 273KHz - 1343KHz
to keep the range overlapping properly with the selected station, the span offset is taken up by adjusting the iron core positions relative to each other
it's a pretty neat Rube Goldberg machine, but it works repeatably.

once removed from the rubber holder grommet, i slipped the coil apart into it's two halves, the inner one is a solid winding 1 layer thick end to end, i only had to re-wrap about a half dozen turns at each end and then held it in place with painters tape while the wax was warming up
the outer half i tried preserving the coil but soon it all fell apart,
since it's only 15 - 1/4 turns of evenly spaced wire, i decided pulling it all off and re-wrapping it was easier than trying to re-melt the gyptal in place,
the spacing is not super critical as long as nothing moves when we are done that's what's important
if one wrap is closer or father apart it will have virtually no significance to the desired mutual inductance of the inner-outer coils because the gap is so large between the two and it's an air core.

i taped the wire at one end close to where it was at before (you could see a shadow of the old wire on the core)
then i rolled it on the table top, 15 turns happens fast, so go slow and even
then tape the other end up.
put a dab of wax here and there to hold it all together
then i followed up with a bit of rubber cement in a strip along the wax (not shown)
and finally used a hot air gun to remelt the wax evenly once the rubber cement strip was holding

wax is a good intermediate holding solution because it's very easy to undo if something goes wrong before you commit with the rubber cement
-s

Attached Files
center_coil_loose.jpg (73 downloads)
coil_apart.jpg (78 downloads)
coil_wax_only.jpg (78 downloads)
Oscilator_circuit.jpg (73 downloads)

1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1308683
Fri Apr 26 2019 07:50 PM
Fri Apr 26 2019 07:50 PM
2
2ManyTrucks  Offline OP
Shop Shark
Joined: Aug 2018
Posts: 189
california
update
still waiting on the plating shop, so in the mean while, here are some photos of the tuning clutch getting a new rubber pad
for this task i used part of an inner tube, sanded it smooth then glued it to the assembly with contact cement,
you can't use rubber cement for this task (i tried), rubber cement only seems to work when it's rubber to rubber, it peels off the aluminum very clean and easy
contact cement seems to hold more like original

the clutch serves two purposes in the tuning assembly,
one is to allow the tuning knob to slip if you try to turn it past the end of the mechanism limits, the knob is worm gear driven so you would have insufficient feedback before things got a lot of forces applied
the second purpose is that it has a dis-engagement lever used when any of the tuning buttons are depressed, the first part of travel of a button opens the clutch before the final travel meets with two parallel rods to swing the tuning core guide bar.

for interest sake i included a photo of three button assemblies side by side with with different parts of the AM band programmed into them
this is where the "memory" of a tuned station is stored in the radio
these buttons have both ends and the center of the AM band stored via the half round disk that can swing to any angle.
when a button is pulled out, that tiny disk can float free, as you push it back in, it hugs the two parallel tuning bars that rotate around a mid point
the disk rotates to match the position of the two parallel bars perfectly as you press the button back in for programming, then on final travel of the programming action a lever pinches this half disk to clamp it firmly into position to remember the station.

-s

Attached Files
clutch_rubber.jpg (57 downloads)
clutch_glue.jpg (57 downloads)
clutch_trimmed.jpg (56 downloads)
knob_memory.jpg (55 downloads)

1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1308690
Fri Apr 26 2019 09:41 PM
Fri Apr 26 2019 09:41 PM
truckernix  Offline
Master Gabster
Joined: Mar 2002
Posts: 8,826
Bracebridge Ontario Canada
If you are OK with the idea, maybe we could get your posts eventually stored as a Tech special.


1951 GMC 1 Ton Flatbed -- It is finally on the road and what a great time I have driving it!
1951 1 Ton Completed


My Chevy Master 4 Door is on the Road!
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1308698
Sat Apr 27 2019 12:00 AM
Sat Apr 27 2019 12:00 AM
2
2ManyTrucks  Offline OP
Shop Shark
Joined: Aug 2018
Posts: 189
california
Hi truckernix, yes if someone wants to save the info or make an article out if it that’s fine by me, I think that would be neat.
I’ll answer any questions the best I can, also I’ll take advice too, i know I’m not going for perfection most days, but I’m trying the best I can with the motivation I got.
-s


1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1309200
Wed May 01 2019 05:02 PM
Wed May 01 2019 05:02 PM
2
2ManyTrucks  Offline OP
Shop Shark
Joined: Aug 2018
Posts: 189
california
finally got some parts back from the hot dip galvanizing
the original zinc was likely electroplated on, but i decided to take a risk and see how hot dip would turn out on some thicker steel parts

the zinc is quite thick in some places, i have spare parts of most of these pieces so later i can rework them and decide which way to go
the hot dip process is a bit rough on the smallest parts, i see it did damage the light reflector part, fortunately it is not the one from the radio it was a spare that i was ready to sacrifice for the cause... so now i know better

there may not be updates for a little while now, got to make progress on spring outdoor things
but i will return to it,
feel free to send questions as usual
-s

Attached Files
hot_dip.jpg (30 downloads)

1430s, 1420, 9430
-2MT
Re: Excellent, another radio to play with [Re: 2ManyTrucks] #1314690
Tue Jun 18 2019 12:39 AM
Tue Jun 18 2019 12:39 AM
2
2ManyTrucks  Offline OP
Shop Shark
Joined: Aug 2018
Posts: 189
california
I was away for a while working on other projects, but i did make a bit of progress on the radio.
while being near the gas welder, i fixed the radio housing.
i wanted to see if i could weld it reasonably okay without totally destroying it.
now that i have something that might be usable i'll spend time cleaning it up, i'll likely fill in the remaining imperfections with epoxy.

attached photos of the rusted / broken dimples that hold one end of the housing together
notice one slot was stamped a bit too close to the edge and rotted open
i managed to make a new dimples and welded patches with fresh dimples in, the radio housing is 0.040 thick, i couldn't find material in that thickness in all my junk, so 0.035 got used.

this weld mess of mine can always be cut out and redone if a better radio housing cannot be located in the future smile
it will be our secret for now
-s

Attached Files
housing1.jpg (7 downloads)
housing2.jpg (6 downloads)
housing3.jpg (6 downloads)
housing4.jpg (6 downloads)
housing5.jpg (6 downloads)

1430s, 1420, 9430
-2MT
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Moderated by  truckernix 

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