A couple of the public libraries around me have 3D printing ability listed as services available at nominal cost.?

Yep, with CW or JT65 (with error correction) you can do a lot with a
very little.
Great job
Congrats

10000 miles Excellent. I got a ssb contact with a Australian ham on phone a couple of weeks ago.

I wonder if the yahoos with amps are still going to be going strong when the bands come back.

3D printing has become a home closet industry.? Google terms such as" Who can print my 3D close to me" and you should be able to find a number of folks to get quotes from.? All you need to do is provide the .stl file.? Prices may be all over the ballpark so don't be surprised at the answers.? Pricing will probably be based on a one time setup, cost of material per gram (perhaps $0.05) and a cost per minute or hour for printer time (perhaps $1 or $2 per hour expressed in hours and minutes)? 3D printing is not fast...

Hi Ron

Fascinating and well done. I am still in the process of setting up my uBitx (got to tick off some other projects first), so it's always interesting to read about what this little thing can do.

Cheers
Ben
ZS6BDK

K3 could be just fine.

With power off, the relays are in their receive position as shown the the schematic.
The antenna is grounded for your DC ohmmeter by way of T2, via L4,3,2,1, K1 and K2

As per my previous post, my guess is that when you power up it immediately goes into transmit mode.
Now the antenna is grounded by way of T11, via KA1,2,3, L11,12,13 and K3.
In either case, all of TP1, TP2, TP8 and the antenna are DC grounded.
That would be true of a perfectly functioning rig, except it should not power up in transmit mode.

I'm guessing a miswire or two in following the hfsignals ubitx wireup instructions.
Perhaps in that 4.7k resistor that should be on the morse key line.
And perhaps also somehow in how the mike got wired up, such that plugging in the mike
somehow brings it back to receive.
?

Glad you got it to work Dan.

That's the beauty of the rig, being able to customize it to your application.

Just a question, why not load the latest software on your V3 rig (maybe you made some modifications of the firmware)?

73, John

Staples does this now

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Thank You John (vk2eta),? I edited the define statements in the ubitx_menu.ino file per your suggestion, it compiled, uploaded and ran perfectly.? I reordered about half of the define statements to make it easier to use with CW for SOTA.? I made RIT the first menu item so with a double click I turn it on or off.? Next is MEMTOVFO to make quick band changes and then the MODE to switch between CWU and SSB followed by VFO_TOGGLE, BAND, and?CW_SPEED.?
That takes care of my new Version 5.? Now on to my Version 3 which I think uses case statements which should be easy to figure out.
?
Best Regards,
73 Dan KA7GPP

A hack for am recieve

1) disable 12 Mhz CLK 0 ...Software would be best but ...I terminated it into 50 ohms at the raduino...Works but not ideal

2) hooked this circuit to junction of R114/R115 ...


instead of at C222-1 ...

Gets am,? Volume won't knock your socks off (need more gain as at that point rf is about 5/10 mV p-p but )...
10 mhz WWV (usb=9,996,000)(lsb=(10,002,800) or so ...

If you're speaking about the circuit I posted, the jfet (j310) is a depletion mode jfet ie. normally ON ...at zero bias on the gate, about .1 ma is flowing (voltage between source and drain = .004 volts),? negative going voltage at the gate turns it OFF (gradually) ie the tranconductance curve is a lot more 'sloped' than that of the 2n7000 mosfet (on/off at about +2.2 volts)

As the jfet is conducting signal passes thru ..(no attenuation) as signal increases, gate voltage decreases (goes minus) turning the jfet off increasing the resistance from drain to source attenuating the input signal

Diodes comprise a Negative Voltage Doubler...22 Uf cap governs attack time 100k resistor governs decay time

Jens,

That's great progress, you know about where the problem is.
Sounds like the rig is powering up in transmit mode, not good, you need to follow up on this.
I suggest you triple check that you have the 4.7k resistor installed properly at the keyer jack:
? ??
No idea why plugging in the mike.

Verify that when powering up the rig (with or without a mike) that a voltmeter sees 12 volts to ground on
the TX node, and zero volts to ground on the RX node.

When powering up the rig, relay K1 supplies 12v to the RX node to activate the receiver circuits
the TX node should be 0 volts when receiving.
When pressing PTT or when using the morse key (or when the morse key does not have the 4.7k resistor),
the rig will go into transmit with TX at 12v and RX at ground.

Going back a bit further, relay K1 is activated for transmit by the T/R node going into R150 at Q15.
The node TR should be zero volts when receiving, around 5v when transmitting.

Yes, Q70 is the audio pre-amp, only used during receive.

Jerry, KE7ER

Hi Jerry,

I have now been able to start with the 'noise injection' test:

I first connected the wire to TP21 and could hear noise increase
(VOL set to high). This was not much of a surprise because I
had already established that the LM386 is working.

Then I connected the wire to TP20 (output of the de-modulator?)
and found that I could not hear any difference in noise level.

If I read the uBitx v5 schematic correctly, this could mean that
the Q70 transistor (type 2N3904) or the relay K3 might be damaged.
I assume Q70 acts as an audio pre-amplifier(?).

I continued by measuring continuity between C51 (M1) and TP21 (M2)

with the uBitx turned off: continuity exists (expected)
with the uBitx turned on: continuity does not exist (?) (not expected)

I expected that continuity continues to exist when the uBitx is
turned on.

Also:

with the uBitx turned on *or* off:
continuity exists between TP8 (TX path) and ANT (antenna center conductor)
and TP1/TP2 and ANT

This is strange - based on the schematic it should be:

Either there is continuity between TP1/TP2 and ANT *or* TP8 and ANT - not
simultaneously.

My conclusion:
Maybe the relay K3 is damaged (or somehow 'stuck').

I was almost ready to send this email when I tried one more thing ...

I noticed in the past that a relay in the uBitx rapidly switches back and forth
when I startup the radio *and* have the? MIC cable (coming from the
soundcard) already plugged in.

So I figured, if the relay is 'stuck' - maybe I can 'free' it by plugging
the MIC cable in again and force the rapid back and forth switching.

Bingo - it worked, RX is working again.

Next up: fixing TX ... (don't have time for this today as this will require some surgery ...)

I am very thankful for everybodies help in this endeavor,

-jens (KM6ZJV)

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Thanks Sam. I’ll try this out today.?

I need one of these printed in Black, anybody know where I could get this done?

Joel
N6ALT

I am dropping the price to $120, plus shipping, which includes insurance. ?If no one wants it at this price, it stays with me. ?This is for the complete unaltered kit, plus the complete Amateur Radio Kits Universal Case DA Gray make just for this radio. ?The price will not go any lower than this. ?The complete kit with case retails near $200. ?This is the final offer.