Date   
Re: Variable power control

ad4xx@...
 

I was hoping for a higher degree of variability...say, 3W up to max, with 5 watts being my target (for CW). Not sure how I will proceed yet but I am hearing a few pretty good suggestions.

Thanks!

Jim
---- John McFadden <johnamcf@...> wrote:

How variable does it need to be? Could the Raduino drive a relay to
switch between the board's power level and a higher voltage source by a
software menu satisfy your need? Or are you looking for more than two
levels?

John


On 1/1/2018 11:19 AM, ad4xx@... wrote:
I'd love it if I could add a variable control to adjust output power
on the uBitx.  After looking for solutions, I understand now that it's
not a simple add of a potentiometer.  Anyone done this yet?

Re: Variable power control

 

Will trimming down RV1 work? I just want it set to a nice 5W cw key down. 

Re: BCI filter question.

ohwenzelph
 

do you have to order 3 boards and what is the difference between selecting and not selecting 2 oz. copper?


Re: Variable power control

Gordon Gibby
 

​yes that will work.....but it won't be 5 watts on the NEXT band you check....




From: BITX20@groups.io <BITX20@groups.io> on behalf of N8DAH <Dherron@...>
Sent: Tuesday, January 2, 2018 2:32 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Variable power control
 
Will trimming down RV1 work? I just want it set to a nice 5W cw key down. 

Re: Variable power control

ad4xx@...
 

That's why I was hoping for an adjustable pot on the front panel.



Jim - AD4XX

-------- Original message --------
From: Gordon Gibby <ggibby@...>
Date: 1/2/18 3:28 PM (GMT-05:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Variable power control

​yes that will work.....but it won't be 5 watts on the NEXT band you check....




From: BITX20@groups.io <BITX20@groups.io> on behalf of N8DAH <Dherron@...>
Sent: Tuesday, January 2, 2018 2:32 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Variable power control
 
Will trimming down RV1 work? I just want it set to a nice 5W cw key down. 

Re: Si5351/A Utility Console

Michael Hagen
 

Yea, I had to reload the EtherKit Library.  Once I got an example to compile, I got the Utility Console to compile.

Thanks!!

Mike, WA6ISP


On 1/2/2018 11:10 AM, Karl Heinz Kremer, K5KHK wrote:
Mike, 

I just cloned the GIT project, and it compiles without errors in Arduino 1.8.5. Do you have a recent version of the EtherKit Si5351 library? 
--
Karl Heinz - K5KHK

-- 
Mike Hagen, WA6ISP
10917 Bryant Street
Yucaipa, Ca. 92399
(909) 918-0058
PayPal ID  "MotDog@..."
Mike@...

Re: Tell me your favorite uBitx mods

Tim Gorman
 

If you make this change then the ubitx should work perfectly with an
external keyer, correct?

I have an old keyer kit that is really small that would fit right in a
decent size enclosure. I don't use it any more on the big rig, an
ftdx-3000, and this would let me repurpose it!

tim ab0wr

On Tue, 02 Jan 2018 07:04:54 -0800
"John Pieper" <j.pieper@...> wrote:

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
( https://groups.io/g/BITX20/message/37720 ) for details.

John AD0RW

Re: Variable power control

Gordon Gibby
 

​lots easier to adjust the AUDIO INPUT on the front of a signalink, eh?




From: BITX20@groups.io <BITX20@groups.io> on behalf of Jim - AD4XX <ad4xx@...>
Sent: Tuesday, January 2, 2018 3:49 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Variable power control
 
That's why I was hoping for an adjustable pot on the front panel.



Jim - AD4XX

-------- Original message --------
From: Gordon Gibby <ggibby@...>
Date: 1/2/18 3:28 PM (GMT-05:00)
To: BITX20@groups.io
Subject: Re: [BITX20] Variable power control

​yes that will work.....but it won't be 5 watts on the NEXT band you check....




From: BITX20@groups.io <BITX20@groups.io> on behalf of N8DAH <Dherron@...>
Sent: Tuesday, January 2, 2018 2:32 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Variable power control
 
Will trimming down RV1 work? I just want it set to a nice 5W cw key down. 

Re: Variable power control

 

 I will set for the band that has the highest output and live with what I get.

 I just need 2-5W on all bands and I will be happy with that.

 I have plans for digital work as well as use with an amp so not stressing the irf510's is mostly my priority. I realize its not the solution people are looking for, I have been lowering my audio drive level to adjust but for CW and ssb its a no go.

I too would like some adjustment but can live with what I get.

Group has a lot got smart folks I'm sure we will figure out a nice mod.

Re: Variable power control

 

On Tue, Jan 2, 2018 at 01:17 pm, N8DAH wrote:
Group has a lot got smart folks I'm sure we will figure out a nice mod.
I am not one of them if you can tell by typing skills hihi

Re: Antenna tuner for uBitx

Rahul Srivastava
 

Hi! Raj,

I had many LDG z100 plus at my disposal, I found that the match at low power levels was inconsistent. Had to reduce the resistors in ADC sample line for QRP operation double check with another SWR meter inline at how low it goes.

73

Rahul VU3WJM 

Re: Variable power control

M Garza <mgarza896@...>
 

Kind of crude, but you could power the entire radio with 24v.  Use a 12v regulator for the receiver and a LM350 for a variable regulator to the PA.  You could set it up to be variable for only a few volts change to vary the output.  You alternately could use a 12 v source and the LM350 to vary the voltage to the PA.  Again, you could design something that would vary by a few watts.
Running from 24v lets you get the higher output but allows you to turn things down, as needed.

Here are a couple of  LM317/350/358 calculator pages:


Hope this helps.

Marco - KG5PRT



On Tue, Jan 2, 2018 at 3:20 PM, N8DAH <Dherron@...> wrote:
On Tue, Jan 2, 2018 at 01:17 pm, N8DAH wrote:
Group has a lot got smart folks I'm sure we will figure out a nice mod.
I am not one of them if you can tell by typing skills hihi


Re: Variable power control

Jack Purdum
 

Ok, I'll probably look silly asking this, but you all know I'm a software guy, not EE, so here goes. Why can I have a 24V supply and use this:

ebay # 152837387238

to drop the voltage to 5V? It seems that less power goes up in heat using one of these, so why won't these work?

Jack, W8TEE



From: M Garza <mgarza896@...>
To: BITX20@groups.io
Sent: Tuesday, January 2, 2018 4:32 PM
Subject: Re: [BITX20] Variable power control

Kind of crude, but you could power the entire radio with 24v.  Use a 12v regulator for the receiver and a LM350 for a variable regulator to the PA.  You could set it up to be variable for only a few volts change to vary the output.  You alternately could use a 12 v source and the LM350 to vary the voltage to the PA.  Again, you could design something that would vary by a few watts.
Running from 24v lets you get the higher output but allows you to turn things down, as needed.

Here are a couple of  LM317/350/358 calculator pages:


Hope this helps.

Marco - KG5PRT



On Tue, Jan 2, 2018 at 3:20 PM, N8DAH <Dherron@...> wrote:
On Tue, Jan 2, 2018 at 01:17 pm, N8DAH wrote:
Group has a lot got smart folks I'm sure we will figure out a nice mod.
I am not one of them if you can tell by typing skills hihi



Re: Variable power control

Gordon Gibby
 

​Good plan -- that should work.  



From: BITX20@groups.io <BITX20@groups.io> on behalf of N8DAH <Dherron@...>
Sent: Tuesday, January 2, 2018 4:17 PM
To: BITX20@groups.io
Subject: Re: [BITX20] Variable power control
 

 I will set for the band that has the highest output and live with what I get.

 I just need 2-5W on all bands and I will be happy with that.

 I have plans for digital work as well as use with an amp so not stressing the irf510's is mostly my priority. I realize its not the solution people are looking for, I have been lowering my audio drive level to adjust but for CW and ssb its a no go.

I too would like some adjustment but can live with what I get.

Group has a lot got smart folks I'm sure we will figure out a nice mod.

Re: Tell me your favorite uBitx mods

K9HZ <bill@...>
 

I use the RD15HVF1 exclusively so i don't need to worry about multiple parts.  The gain of both parts is very close and they are pin compatible. 


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:  bill@...

 


On Jan 2, 2018, at 11:09 AM, K5ESS <k5ess.nothdurft@...> wrote:

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: Variable power control

M Garza <mgarza896@...>
 

Jack,
Nothing wrong with that.  It should work fine, as long as it doesn't introduce any RF hash from the switching regulator.  
I would think that you could replace the variable that controls the voltage with a panel mounted one.

Marco - KG5PRT

On Tue, Jan 2, 2018 at 3:47 PM, Jack Purdum via Groups.Io <jjpurdum@...> wrote:
Ok, I'll probably look silly asking this, but you all know I'm a software guy, not EE, so here goes. Why can I have a 24V supply and use this:

ebay # 152837387238

to drop the voltage to 5V? It seems that less power goes up in heat using one of these, so why won't these work?

Jack, W8TEE



From: M Garza <mgarza896@...>
To: BITX20@groups.io
Sent: Tuesday, January 2, 2018 4:32 PM
Subject: Re: [BITX20] Variable power control

Kind of crude, but you could power the entire radio with 24v.  Use a 12v regulator for the receiver and a LM350 for a variable regulator to the PA.  You could set it up to be variable for only a few volts change to vary the output.  You alternately could use a 12 v source and the LM350 to vary the voltage to the PA.  Again, you could design something that would vary by a few watts.
Running from 24v lets you get the higher output but allows you to turn things down, as needed.

Here are a couple of  LM317/350/358 calculator pages:


Hope this helps.

Marco - KG5PRT



On Tue, Jan 2, 2018 at 3:20 PM, N8DAH <Dherron@...> wrote:
On Tue, Jan 2, 2018 at 01:17 pm, N8DAH wrote:
Group has a lot got smart folks I'm sure we will figure out a nice mod.
I am not one of them if you can tell by typing skills hihi




Re: Tell me your favorite uBitx mods

David Arthur
 

A mini usb "breakout" would be nice for uploading new Raduino sketches without opening up the box. Could double as a CAT control interface.


On Tue, Jan 2, 2018 at 4:53 PM K9HZ <bill@...> wrote:
I use the RD15HVF1 exclusively so i don't need to worry about multiple parts.  The gain of both parts is very close and they are pin compatible. 


Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

 

Owner - Operator

Big Signal Ranch – K9ZC

Staunton, Illinois

 

Owner – Operator

Villa Grand Piton - J68HZ

Soufriere, St. Lucia W.I.

Rent it: www.VillaGrandPiton.com


email:  bill@...

 


On Jan 2, 2018, at 11:09 AM, K5ESS <k5ess.nothdurft@...> wrote:

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?


--
David K4DBZ
Unofficial bitx chatroom: https://discord.gg/CrHvWFc

Re: Variable power control

Jerry Gaffke
 

Yes, a switcher is much more efficient than a linear regulator,
but amps of current getting switched at one mhz or so can create hash you hear in the receiver if 
not properly filtered and shielded.   I can receive well using a desktop 12v brick meant for use with a monitor, 
it is also a switching power supply, so it may be possible to use that ebay buck converter.

Another possibility is to normally power from 12dc, and enable a boost converter to generate 24v
only when transitting. Many switcher chips have an enable pin, though I don't see an enable 
talked about on most of the board level products available on the web.

Much of the rig power during receive is going to the Nano and display and si5351.  
Could cut that significantly with a 12 to 3.3v buck switcher (using 3.3v display and processor)
if you could get it clean enough.

Jerry, KE7ER


On Tue, Jan 2, 2018 at 01:47 pm, Jack Purdum wrote:
Why can I have a 24V supply and use this:    ebay # 152837387238
to drop the voltage to 5V? It seems that less power goes up in heat using one of these, so why won't these work?

Re: BCI filter question.

Smitty, KR6ZY
 

They come in 3s, yes. Any multiple of three is a valid order quantity. This is an artifact of how they manufacture the boards. These boards are small enough and hence cheap enough it hopefully won’t be a problem. 

Don’t choose the 2oz copper. It’s a thicker copper on the board, but at also a thinner board. Probably not what you want. 

-Mark

On Jan 2, 2018, at 11:53 AM, ohwenzelph via Groups.Io <Ohwenzelph@...> wrote:

do you have to order 3 boards and what is the difference between selecting and not selecting 2 oz. copper?


Re: Selecting the correct BFO frequency

Kerr Smith
 

Hi Jerry,

Thanks for confirming this.

As I am going to be using a 3MHz VFO I think I will have a go and see if I can increase the BFO frequency up so it is above the crystal filter (or about 20dB down the side as suggested by Dave). I will try different values for the series capacitor and see if I can get it to move up to the required location.

Thanks for the link as well, this is another circuit I can have a go at creating - it looks quite an interesting one.

Kerr