Date   
Re: Tell me your favorite uBitx mods

K5ESS
 

I would think they are a reliable source also.  Unfortunately they are no-stock on the RD16HHF1.  RD15HVF1-101 may work.  Anyone care to comment?

Mike

K5ESS

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Diver Martin
Sent: Tuesday, January 2, 2018 9:45 AM
To: BITX20@groups.io
Subject: Re: [BITX20] Tell me your favorite uBitx mods

 

My assumption is RFParts is a reliable source.  That's where I've gotten mine.  Given my employment with a semiconductor company that makes (competing) RF parts, I rarely go near ebay.

 

On Tue, Jan 2, 2018 at 7:43 AM, K5ESS <k5ess.nothdurft@...> wrote:

Yes.  This part is particularly prone to fakes.  It would be helpful if folks could post both reliable and unreliable sources for these.

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Monday, January 1, 2018 11:23 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Tell me your favorite uBitx mods

 

Careful with those $0.85 RD16HHF-1's
Often some random switcher FET with fresh paint.
Google "fake RD16HHF"

On Mon, Jan 1, 2018 at 08:03 pm, Dave Bottom wrote:

Maybe a shift to Mitsubishi RD16HHF-1 MOSFET is worth a try. ...  They are everywhere from $5 each here in the US to US $0.85 (China) in lots of 10.



 

--

Martin Held - AE7EU

http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

Re: BITX20 Ver3C SBL VFO

Paul Smith
 

I just went through the same process with my Ver3B VFO, having had the same spread issue you have. I put a resistor (5k6 in my case) directly across the pot to reduce its range. And as Sarma suggests, I also added another 1k on the leg to bring the low end freq up as it was running too low.  In the end dropped the VFO spread from 530 to 360kHz. Incidentally, I have the VFO free-running without FLL and have to agree that it is very stable, though I did a few mods to improve that.

73 Paul ZS2OE 

Re: No TX #ubitx

joe kallo <quietglow@...>
 

Right, so the directions say to go to min and then turn one pot until the current is 100mA higher, then to do the same w the other. Thats what I did, but my starting min current was 50mA lower than the spec in the directions. I didn't think it was enough it make a difference, but now with it not working I'm wondering.

To be clear, once I adjusted the bias as per the instructions, I measured 620mA when PTT was depressed.

Joe

Re: Tell me your favorite uBitx mods

Diver Martin <diver.martin@...>
 

James, et al,

Is there any one particular clock that you'd rather have as an Si570 that'd be best for phase noise, or would it need to be all 3?  It'd be easy enough to add the footprint, doesn't necessarily need to be populated.  My assumption is the clock for the first mixer on RX that brings the signal to the 45Mhz IF.

On Tue, Jan 2, 2018 at 6:24 AM, <jamesrocks4ever@...> wrote:
Maybe an Si570 for low phase noise. Serial connection for possible remote operation with the rtl and web sdr on a tablet. I have been thinking about laying out modules in 0805 two sided boards to make it fit in a smaller package. 
 I was actually waiting to get the ubitx until the first wave of mods. I’ve had the bitx out of a case more than in one doing mods.

James

Sent from my iPhone

On Dec 31, 2017, at 20:29, Diver Martin <diver.martin@...> wrote:

Hello all,

As I'm doing a motherboard mod, I'm looking to incorporate a bunch of mods into one PCB.  Right now, what I've got going are the following:

* A tuner + SWR Bridge (phase detector maybe?)
* A spot for an RTL-SDR (blogV3) dongle
* AGC Modifications
* Integrating LCD and headphone/mic/BNC/Power/etc jacks into the PCB

Other things I've thought about, space depending:

*Adding in footprints for a chinese AD9850 DDS module for one of the clock signals

I would like to hear the top mods you've done, and what you'd love to see integrated into a motherboard PCB that fits on top of the uBitx.  Battery charger?  Battery adapter? I dunno, bring it on!  If you have a favorite AGC mod, please tell me about it, and make some suggestions as well.  This is not promising to be a cheap kit, and full of SMT, but something I might make available.

Happy new year,

--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?




--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

Re: No TX #ubitx

 

Fully clockwise is the minimum current!

At 02-01-2018, you wrote:
Actually, I was going to post this as a separate issue, but in the PA bias step my initial reading was outside the range mentioned in the directions. With both bias pots at fully clockwise, I measured 420 mA when PTT is depressed. The directions indicate it should be 470 - 500. Could this be the problem?

Fwiw, my power supply is a 30A 12v deal.

Again, many thanks for the help!

Re: Tell me your favorite uBitx mods

Diver Martin <diver.martin@...>
 

My assumption is RFParts is a reliable source.  That's where I've gotten mine.  Given my employment with a semiconductor company that makes (competing) RF parts, I rarely go near ebay.

On Tue, Jan 2, 2018 at 7:43 AM, K5ESS <k5ess.nothdurft@...> wrote:

Yes.  This part is particularly prone to fakes.  It would be helpful if folks could post both reliable and unreliable sources for these.

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Monday, January 1, 2018 11:23 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Tell me your favorite uBitx mods

 

Careful with those $0.85 RD16HHF-1's
Often some random switcher FET with fresh paint.
Google "fake RD16HHF"

On Mon, Jan 1, 2018 at 08:03 pm, Dave Bottom wrote:

Maybe a shift to Mitsubishi RD16HHF-1 MOSFET is worth a try. ...  They are everywhere from $5 each here in the US to US $0.85 (China) in lots of 10.




--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

Re: Tell me your favorite uBitx mods

K5ESS
 

Yes.  This part is particularly prone to fakes.  It would be helpful if folks could post both reliable and unreliable sources for these.

Mike

K5ESS

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Monday, January 1, 2018 11:23 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Tell me your favorite uBitx mods

 

Careful with those $0.85 RD16HHF-1's
Often some random switcher FET with fresh paint.
Google "fake RD16HHF"

On Mon, Jan 1, 2018 at 08:03 pm, Dave Bottom wrote:

Maybe a shift to Mitsubishi RD16HHF-1 MOSFET is worth a try. ...  They are everywhere from $5 each here in the US to US $0.85 (China) in lots of 10.

Re: uBitx IRF510 to IRF510 physical measurement

bill richardson
 

Thanks i will make sure to isolate and ground the heat sink

Sent from my iPhone

On Jan 2, 2018, at 1:36 AM, John Backo <jabac@...> wrote:

Bill:

That's a good heat-sink for the IRF510 pair. Just be wary of shorting the devices to ground.
Also note that pc board and plastics are a very poor conductor of heat -- if you are building a case from non-metallic
materials, be sure that the IRF510's are connected DIRECTLY to the metal, and not through
the wall of the enclosure. Also, ground the metal. Hi.

I have bought this kind of heat-sink as surplus. They are used on voltage converters and inverters,
especially in solar installations.

john
AD5YE





Re: Tell me your favorite uBitx mods

Vince Vielhaber
 

Also look at the other offerings from your chosen seller. I looked at some last nite and it's actually cheaper to order them by 2s instead of 10s. In fact, with shipping, Buying 20 by 2s comes out to 78 cents each including shipping. They're 1.37 for 2. The same company is charging 8.50 for 10. Both add 1.85 for shipping, but additional quantities are free shipping.

Vince.

On 01/02/2018 12:22 AM, Jerry Gaffke via Groups.Io wrote:
Careful with those $0.85 RD16HHF-1's
Often some random switcher FET with fresh paint.
Google "fake RD16HHF"

On Mon, Jan 1, 2018 at 08:03 pm, Dave Bottom wrote:

Maybe a shift to Mitsubishi RD16HHF-1 MOSFET is worth a try. ...
They are everywhere from $5 each here in the US to US $0.85 (China)
in lots of 10.

Re: Tell me your favorite uBitx mods

 

Dave : 

For CW filtering on my BITX40 I used a SOTABEAMs Laserbeam DSP Audio Filter module and it works brilliantly. 

If you are a hard-core contester then it is no substitute for a real narrow IF filter but then again, if you are a hard-core
contester you are likely using a radio that costs more than $129. For casual CW use, a very good AF filter does wonders. 

These little DSP modules come pre-assembled, are simple to wire up and outperform any analog audio filter I have ever used. 
There are a number of options for the Dual Filter and there is a also one with a variable filter bandwidth as well. 
If you install the optional signal LED, it doubles as a CW tuning indicator (i.e. it blinks in time with the signal when 
it is in the middle of the filter passband). Also the current draw is around 30ma. 

Best of all they start at around $US30 and shipping costs from the UK are very reasonable. 

I picked up a second module that I plan to use on my uBITX. 

Cheers 

Michael VE3WMB 

P.S. Here is a link : 

https://www.sotabeams.co.uk/audio-products/

P.P.S. Usual disclaimer applies .. I have no financial interest in SOTABEAMs ... I am just a very satisfied customer. 

Re: No TX #ubitx

joe kallo <quietglow@...>
 

Actually, I was going to post this as a separate issue, but in the PA bias step my initial reading was outside the range mentioned in the directions. With both bias pots at fully clockwise, I measured 420 mA when PTT is depressed. The directions indicate it should be 470 - 500. Could this be the problem?

Fwiw, my power supply is a 30A 12v deal.

Again, many thanks for the help!

Joe

Re: Tell me your favorite uBitx mods

John Pieper
 

i addressed the erratic keying a few days ago but it sank like a stone.
The reluctance to send the first dit is due to the firmware. It is trying to enforce correct character spacing but the consequence is that the paddle is sampled very slowly when it is open (i.e. a character is not already started). I was able to undo this in my setup and always sample as fast as possible (within constraints of not using interrupts, which people seem to have a problem with) and got much better responsiveness. See message 37720 for details.

John AD0RW

Re: Si5351/A Utility Console

Arv Evans
 

Bruce

Thanks for sharing.  I am working on a piece of test equipment that uses Si5351a and
found your command interpreter interesting and informative. 

Arv  K7HKL
_._


On Mon, Jan 1, 2018 at 7:32 PM, Bruce MacKinnon KC1FSZ <bruce@...> wrote:
This has been very useful to me so I'll share it in case it is useful to others.

I have written an Arduino sketch that provides a simple command-line console (serial) to control most features of an Si5351/A.  This provides a very generic tool that can be used during the early phases of home-brew rig development when you just want to get the RF/IF chain up and running in a minimal way without fooling around with displays, encoders, Arduino coding, etc.  Just load up this sketch, connect the I2C pins to the Si5351/A, open he Serial Monitor (or other terminal program) and you're ready to start tuning.

There are some handy features that make it easy to deal with superhet math and filter pass-band tweaking. The details are here: https://github.com/brucemack/Si5351-Console.

I'm doing a scratch-build of the BITX-40 with some modifications so I've been using this sketch a lot.  For my BITX I use CLK0 for the VFO, CLK2 for the BFO, and CLK1 as an RF signal injector/tester.  Here is a video of the receive side up and running: https://www.youtube.com/watch?v=nueR5nY3wYc

Happy New Year and 73s,

Bruce KC1FSZ 


Re: BITX20 Ver3C SBL VFO

Kevin Luxford
 

Thanks for your help, Sarma. Will try that tomorrow. This VFO is the most stable that I have ever worked with. Can't wait to get it on the air. 73 all, Kevin VK3DAP / ZL2DAP


--
Kevin B. G. Luxford
kbgluxford@...

Re: Wiring encoder

Jack, W8TEE
 

All:

Before messing around with the unsoldering/resoldering the connections, if you have the Arduino IDE installed and are comfortable with it, load the ubitx_20.ino source code file and locate line 75-76:

#define ENC_A (A0)
#define ENC_B (A1)

Try reversing these symbolic constants:

#define ENC_B (A0)
#define ENC_A (A1)
and see if that restores the proper rotation. Mine is all bundled up for a pending presentation, and I don't want to unpack it.

Jack, W8TEE


From: ekelley <ekelley828@...>
To: BITX20@groups.io
Sent: Tuesday, January 2, 2018 1:07 AM
Subject: [BITX20] Wiring encoder

A word of caution when wiring the encoder. The schematic on page one
has the encoder wiring reversed. Don't wire it up by the schematic
use the picture, you will see that the red and yellow wires are reversed
and the black and brown are reversed. I made the mistake of wiring everything
up using the schematic. When tuning my frequency goes down with clockwise
rotation of encoder. Goes up with counter-clockwise rotation.
Ed



Virus-free. www.avast.com

Re: BCI filter question.

Karl Heinz Kremer, K5KHK
 

For a cheap BCI filter, take a look here (it's the first article in this document): http://www.qrpforum.de/index.php?page=Attachment&attachmentID=16959&h=269da5721a0d272fc6ce550399700bfc9d9a8155

For a simpler, but slightly more expensive solution, see here: http://www.qrpme.com/?p=product&id=BCI

If you want something you can leave in during transmit, take a look here: http://vk3il.net/projects/broadcast-band-filter/

You an also calculate your own, all you need is a high-pass filter that cuts off just above the AM band. As Gordon suggested, a notch filter might be a good idea as well. 
--
Karl Heinz - K5KHK

Re: Tell me your favorite uBitx mods

jamesrocks4ever@...
 

Maybe an Si570 for low phase noise. Serial connection for possible remote operation with the rtl and web sdr on a tablet. I have been thinking about laying out modules in 0805 two sided boards to make it fit in a smaller package. 
 I was actually waiting to get the ubitx until the first wave of mods. I’ve had the bitx out of a case more than in one doing mods.

James

Sent from my iPhone

On Dec 31, 2017, at 20:29, Diver Martin <diver.martin@...> wrote:

Hello all,

As I'm doing a motherboard mod, I'm looking to incorporate a bunch of mods into one PCB.  Right now, what I've got going are the following:

* A tuner + SWR Bridge (phase detector maybe?)
* A spot for an RTL-SDR (blogV3) dongle
* AGC Modifications
* Integrating LCD and headphone/mic/BNC/Power/etc jacks into the PCB

Other things I've thought about, space depending:

*Adding in footprints for a chinese AD9850 DDS module for one of the clock signals

I would like to hear the top mods you've done, and what you'd love to see integrated into a motherboard PCB that fits on top of the uBitx.  Battery charger?  Battery adapter? I dunno, bring it on!  If you have a favorite AGC mod, please tell me about it, and make some suggestions as well.  This is not promising to be a cheap kit, and full of SMT, but something I might make available.

Happy new year,

--
Martin Held - AE7EU
http://ae7eu.com/
-------------------------------------------------------------------------------
If there aren't any questions, then what is there to learn?

Re: No TX #ubitx

 

Joe had earlier mentioned as far I remember that he had done the TX
current bit. So we have to look elsewhere!

Raj

At 02-01-2018, you wrote:
No, there are 3 wires to the power plug, I think they are Black (0v), Red
(12v Rx power) and Brown (12v/24V PA power). The Brown and Red wires
should both be connected to the 12V power via the on/off switch on the
volume control.

The two supply wires allow you to feed a different (higher) voltage to the
PA transistors to achieve higher output power.

It just sounds like there is no power being applied to the PA stage.

By PA supply wire, do you mean the wire to the speaker/headphone jack? If
so, yes that's hooked up. It's working as a receiver (i.e. I'm copying
activity on the bands) playing through a pair of headphones.

Re: BCI filter question.

Gordon Gibby <ggibby@...>
 

so....that sounds like even with harmonic suppression, you have SIGNIFICANT energy coming at your on the harmonics of their primary frequency.....


hopefullly it ISNT being created within some nonlinear junction in your own radio....the way to prevent that would be a high pass filter in your transmission line designed to pass anything above, say 2 MHz and not pass stuff below that.    I'm guessing you already have those kinds of filters?


beyond that, the actual hamonic radiated energy generated by THEIR TRANSMITTER  is a fact of life, and you aren't going to be able to receive much (other than them) on those frequencies....


if you try and builld a notch filter (high Q, narrow bandwidth) for each of their harmonics youll hear them less....but you'll also hear other people near those frequencies less also....





From: BITX20@groups.io <BITX20@groups.io> on behalf of KG5NII <kg5nii@...>
Sent: Tuesday, January 2, 2018 8:52 AM
To: BITX20@groups.io
Subject: [BITX20] BCI filter question.
 

I am thinking seriously about experimenting with the uBitX but am wondering in advance if someone could suggest  a good broadcast band filter I can build that is known to be effective. I live less than 1 mile (1.6 km) from a 50 kW AM broadcast station transmitting on 1180 kHz. I know this will be a problem with on the uBitX as even on mid, high end commercial ham rigs I get significant interference on 3540, 7040, 14160 kHz and so on.   In fact, I'd probably want to build an additional one for my Yaesu.  I know there are a lot of circuits out there for BCI filters but that doesn't necessarily mean they are or would be effective.  Cost is a major concern,  and commercial filter units seem to be rather pricey, but on the other hand, purchasing the components, etc may not necessarily be cost effective either given the somewhat high cost of shipping and given that  not everything could necessarily be purchased from one place, thereby rising costs even more.    I'd probably want to build one for the uBitX and one for my 100W Yaesu  just to give it over and done with.  There is not a day that goes by that I do not wish the four AM 1180 transmitter  towers down the road from me  are flattened by a tornado until I realize that would only be a temporary reprieve at best  but building, installing some good filters will be a permanent one.  


So advice please.


Thanks.

Ron, KG5NII



Re: No TX #ubitx

Reid Campbell
 

No, there are 3 wires to the power plug, I think they are Black (0v), Red
(12v Rx power) and Brown (12v/24V PA power). The Brown and Red wires
should both be connected to the 12V power via the on/off switch on the
volume control.

The two supply wires allow you to feed a different (higher) voltage to the
PA transistors to achieve higher output power.

It just sounds like there is no power being applied to the PA stage.

By PA supply wire, do you mean the wire to the speaker/headphone jack? If
so, yes that's hooked up. It's working as a receiver (i.e. I'm copying
activity on the bands) playing through a pair of headphones.