Date   
Re: RD16HHF1 power curve flattening...some

Clark Martin
 

Did you reroute the pins on the RD16HHF!, the are in a different arrangement than the IRF510.  The IRF510 is GDS, the RD16HHF1 is GSD.  Swapping the source and drain will blow the fuse like that.

Clark Martin
KK6ISP

On Jul 17, 2018, at 9:30 AM, fr.beckenbauer@... wrote:

Hi everyone,

I tried to do this mod: https://ubitx.net/2018/02/16/power-amp-fix/

I checked everything for shorts, and a multimeter connected to the power input shows typical capacitor behaviour. However, when I connect power, my 3A fuse instantly pops. Is it possible that fake RD16HHF1 are causing this? I'm kinda desperate.

Unbuilt uBITX Ver4 and Blue Cabinet for sale.

William Sallee <k6two@...>
 

I have an Unbuilt UBITX Ver 4 with matching Blue Cabinet for sale.  I want $180 shipped via Priority Mail. Text me 619 518 2547 I just am not motivated to build another superheterdyne transceiver. Not since I discovered SDR direct Sampling.

Re: Help with 40MBITX ... Please!

Don, ND6T
 

And a few here: www.nd6t.com

Re: The new uBITX boards are here

 

I made the mod to my V3 board to change C81 (near Q90) from 0.1 uF to 470pF,  this was to get more even output power across the bands as suggested by
Farhan. 

After doing this my output dropped to about 500 mW !  I was worried that I might have toasted Q90 (literally) in the process so I went back
to 0.1 uF for C81 and I am now back at the previous power levels, so obviously Q90 is still fine.  

After looking at the schematic again, it occurred to me that I either installed the wrong value cap at C81 or perhaps making this change necessitates
re-adjusting the trimmer pot RV1 ?   Can anyone who has successfully made this mod to their v3 board tell me if this is the case? 

Thanks 

Michael VE3WMB 

Re: Unbuilt uBITX Ver4 and Blue Cabinet for sale.

 

So William, what blue cabinet are we talking about here. The amateurradiokits one?

Joel
N6ALT

I think this will work for the Ubitx...microphone

Kevin Rea
 

Hi guys,
I am just getting ready to build my first Ubitx.
I am going to use a Baofeng Microphone to do it.. so I bought one and took it apart..
and this is what I came up with after tracing the wires..
I am just using the microhone part of the mike, not the speaker.

I think this will work......????


Kevin Rea
K6REA

Re: Low output Bitx40

JeffG <jeff.goodley@...>
 

SSB Guy. With both pots turn right up I barely get a flicker on the needle of the power meter. Measures at 500 to 700 mW on transmit. 

Jeff
G6EXF. 

Re: RD16HHF1 power curve flattening...some

Clark Martin
 

Okay, I just noticed the second photo and it does look like you have the source and drains swapped.  Might there be a short between them.  I’d check out each transistor for a short using a ohmmeter.  With the power cable to the board disconnected you should see an open circuit.


Clark Martin
KK6ISP

On Jul 17, 2018, at 1:42 PM, Clark Martin <kk6isp@...> wrote:

Did you reroute the pins on the RD16HHF!, the are in a different arrangement than the IRF510.  The IRF510 is GDS, the RD16HHF1 is GSD.  Swapping the source and drain will blow the fuse like that.

Clark Martin
KK6ISP

On Jul 17, 2018, at 9:30 AM, fr.beckenbauer@... wrote:

Hi everyone,

I tried to do this mod: https://ubitx.net/2018/02/16/power-amp-fix/

I checked everything for shorts, and a multimeter connected to the power input shows typical capacitor behaviour. However, when I connect power, my 3A fuse instantly pops. Is it possible that fake RD16HHF1 are causing this? I'm kinda desperate.

#ubitx #ubitx-help Not able to set up extension switches using CEC firmware #ubitx #ubitx-help

Daniel Conklin
 

I have Ian's firmware version 1.08 and put three momentary switches with resistors between pins 4 and 5 on the encoder.  The resistor values ar 150K, 220K.,and 470K Ohms.  When I press them and click the button to read the ADC values I get 3, 5, and 6.  Those values are not useful.  I am not sure hat I may be doing wrong.  Can anyone here give me a clue?
Thanks and 73.
Dan, W2DLC

Simple RF actuated LED Tx indicator #ubitx #bitx40

Peter Parker
 

Suitable for any QRP rig, this has been worthwhile add-on as it shows that you're putting out power and the microphone is delivering audio. 


https://www.youtube.com/watch?v=iQ8YADOWk9U

Re: Raduino Pill

W3JDR
 

Hi Kees!
I stumbled upon this post while doing Google searches on Raduino. It is, of course, about my Raduino Pill board which is a direct replacement for the stock Raduino, but with an STM32F103 processor and much more I/O. I think it hits all the points on your wish list. I released the PCB to fab a few weeks ago and am waiting for boards to arrive from China. Assuming it functions without major rework, I'll post the CAD files and Gerbers on my web site and encourage others to develop for it. I plan to immediately mod the stock uBITX firmware to run on it, then will expand functionality to incorporate the work I've done with TFT displays, hi-res encoder and software S-meter & AGC. I've cleared my bench in anticipation of arrival and am checking the mailbox every day.

Joe

Re: #ubitx #ubitx-help Not able to set up extension switches using CEC firmware #ubitx #ubitx-help

Richard E Neese
 

ok 1 did you add the required resistors to each switch and it has to be a value of 80 or higher and you have to use the ubitx manager to setup the keys. also if you follow his page on setting them up it explains everything

Re: Help with 40MBITX ... Please!

AA9GG
 

I was looking for your site too but couldn't remember your call Don...

On Tue, Jul 17, 2018 at 4:02 PM, Don, ND6T via Groups.Io <nd6t_6@...> wrote:
And a few here: www.nd6t.com




--
Paul Mateer, AA9GG
Elan Engineering Corp.
www.elanengr.com
NAQCC 3123, SKCC 4628

surprising CW sidetone value in uBITX Manager 0.11 #ubitx

Mike KK7ER
 

I upgraded to CEC 1.08 firmware and ran the uBITX Manager Ver 0.11 software.
It shows reasonable values for most fields.
However, it shows CW Side tone as 4294967295 Hz ( which interestingly is 0xFFFFFFFF).
This is obviously incorrect since it is far beyond human hearing.
In fact I'm surprised that side tone frequency in Hz is encoded with 32 bits.  Seems like overkill.
When I look for CW side tone from the LCD panel menu it is nowhere to be found.  Hmm...
CW speed in uBITX Manager is also shown as 4294967295.
When I view CW speed from the LCD panel it is shown as 12 WPM.  This implies that the register value should be 100.
This leads me not to trust uBITX Manager.  Should I?
Either uBITX Manager is wrong or the LCD panel is wrong or... ?

73 Mike KK7ER

Re: surprising CW sidetone value in uBITX Manager 0.11 #ubitx

Mike KK7ER
 

BTW, I should mention that the version 1.08 that I installed was compiled from the tip of the master branch of the Git repository as of Sunday.  I also tried the precompiled "HEX" file and it behaves the same way.

73 Mike KK7ER

Re: receive works great, but no trans power, #ubitx-help

Jerry Gaffke
 

We have had a couple reports of Q90 frying, but not the mixer.
Perhaps as Gordon notes, these were due to a strong VHF signal.

I believe Gordon has suggested in the past the the failure mode might be 
due to reverse voltage at the BE junction, not forward current.

I have no idea if the back-to-back diodes would significantly contribute to the spurs.
Doubt it would cause trouble where I'm at, as there are no strong local broadcasters.
I should try it, include a strap to remove the diodes if curious about some new spur.
We've got plenty of electrical storms.

Jerry

 

On Tue, Jul 17, 2018 at 01:28 PM, ajparent1/KB1GMX wrote:
It the signals are strong enough to fry Q90 the mixer will soon be gone too.
The BE junction is as robust as the mixer diodes.  so whatever you are seeing
is quite strong and could even be ESD.

For ubitx (V3 or 4) a pair of back to back 1n194/4148 diodes from K3 Pin14 to ground
is the best bet as then its only there for RX and has no impact on TX.

Bitx 20 and 40 the solution is different.

Its easily done on the back of the board.

Allison

Re: RD16HHF1 power curve flattening...some

Kevin Rea
 

On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:
Hi John,
did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea

Re: RD16HHF1 power curve flattening...some

MVS Sarma
 

I too suspect the devices  OP bought.  He could remove them and test with a DMM for the correctness of pinout.
 
 I am currently depending for my RD hhf and hvf devices, on an ebay seller " polida2008" after having suffered fake ones from another seller.
 This seller is now operating with another seller name " 5hk1584 "
 While i have no business deal with this seller(s), I do enjoy genuine devices for my hobby.  Hope it helps.


Regards
MVS Sarma
 vu3zmv

On Wed, Jul 18, 2018 at 9:02 AM, Kevin Rea <reakevinscott@...> wrote:
On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:
Hi John,
did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea


Re: RD16HHF1 power curve flattening...some

Ashhar Farhan
 

Are you sure that the pins are not shorting? 


On Wed, 18 Jul 2018, 10:23 Mvs Sarma, <mvssarma@...> wrote:
I too suspect the devices  OP bought.  He could remove them and test with a DMM for the correctness of pinout.
 
 I am currently depending for my RD hhf and hvf devices, on an ebay seller " polida2008" after having suffered fake ones from another seller.
 This seller is now operating with another seller name " 5hk1584 "
 While i have no business deal with this seller(s), I do enjoy genuine devices for my hobby.  Hope it helps.


Regards
MVS Sarma
 vu3zmv

On Wed, Jul 18, 2018 at 9:02 AM, Kevin Rea <reakevinscott@...> wrote:
On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:
Hi John,
did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea


Re: RD16HHF1 power curve flattening...some

MVS Sarma
 

Farhan jee
 the "c" mark on the right of Logo indicates that devices are fake.If  IRF530  re labelled as indicated that they are fake. I had a bunch of therm. If some one doen't check under item details for a comment   "Make: generic / unbranded" They do get fake ones.

 if we get IRF530 or so re labelled as RD16, Obviously there would be a short , of course through the internal protection diode.

Regards
MVS Sarma
 

On Wed, Jul 18, 2018 at 11:13 AM, Ashhar Farhan <farhanbox@...> wrote:
Are you sure that the pins are not shorting? 

On Wed, 18 Jul 2018, 10:23 Mvs Sarma, <mvssarma@...> wrote:
I too suspect the devices  OP bought.  He could remove them and test with a DMM for the correctness of pinout.
 
 I am currently depending for my RD hhf and hvf devices, on an ebay seller " polida2008" after having suffered fake ones from another seller.
 This seller is now operating with another seller name " 5hk1584 "
 While i have no business deal with this seller(s), I do enjoy genuine devices for my hobby.  Hope it helps.


Regards
MVS Sarma
 vu3zmv

On Wed, Jul 18, 2018 at 9:02 AM, Kevin Rea <reakevinscott@...> wrote:
On Thu, Mar 8, 2018 at 05:14 PM, "John" <passionfruit88@...> wrote:
Hi John,
did you mount the new pot in the front or  back or just leave it on the breadboard ?
kevin rea
lancaster, calif.
k6rea