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Re: Removing insulation from fine wires

Robert Ogburn
 

Way back---I used my teeth...   
The insulation types available today preclude the use of a single hobby price tool. You need to develop your own method for striping the insulation for each insulation type.  My "go to" tools include butane lighters, very very very sharp pen knife used in the fashion described by Mr Davis, x-acto style hobby knife with #11 blade and a home made hot wire stripper...  For coaxial cable I find the "spin around tool" almost essential. They do need maintenance and periodic "calibration".
I still have not developed a technique for removing "enamel" insulation.  Trying strong UV @ 365nM currently...


Re: ?- How high SWR before smoke?

Ralph Mowery
 


I understand full well about how to isolate the irf510s electrically.  However has anyone given any thought as to what may happen, if anything, to the RF coupling if the transistors are mounted on the same heat sink ? 

On Fri, Jul 6, 2018 at 10:24 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Google "TO-220 insulator kit".  You can steal them from old equipment such as a computer power supply.
With two of those and some heat transfer grease, you can mount the IRF510's to one grounded heatsink.
The RD16HHF1's don't need the insulator kit, since the tab is the source pin, and gets grounded anyway.
But the insulator kits work well with the IRF510's.

t/ BITX Web Site of Mike ZL1AXG
https://groups.io/g/BITX20/wiki/home Wiki


Re: ?- How high SWR before smoke?

Jerry Gaffke
 

Google "TO-220 insulator kit".  You can steal them from old equipment such as a computer power supply.
With two of those and some heat transfer grease, you can mount the IRF510's to one grounded heatsink.
The RD16HHF1's don't need the insulator kit, since the tab is the source pin, and gets grounded anyway.
But the insulator kits work well with the IRF510's.


On Thu, Jul 5, 2018 at 09:16 pm, Walter Keen wrote:
For a backpacking radio, as I'm hoping to use my ubitx v3 for, can anyone see reasons to not move to RD16HHF1's or similar, particularly in my case for the reason that a larger passive heatsink out of my parts bin is slightly better to plan for in terms of battery power (weight vs space) , vs a fan or two running on the IRF510's


Re: CEC firmware with RadI2Cino board? #ubitx #firmware #radiuno

John KJ4IFO
 

Jeff -

I thought that this would be fun to try to figure out, too.  Did you ever do any further investigation into using the CEC software with the RadI2Cino board?

John, KJ4IFO


Software for uBITX

Franz.Rebholz@...
 

Hi,

I was successful with

https://groups.io/g/BITX20/topic/ubitx_ide_errors/7715016?p=,,,20,0,0,0::recentpostdate%2Fsticky,,,20,2,0,7715016

Jack is righ,t to know the file structure of arduino for newcomers is difficult and I did not know how to solve it.
(Jack: For reasons I mentioned earlier, it's not a good idea to have multiple *.ino files.)

At least with this information I was successful

Thanks and 73

Franz





Re: Current Draw

John (vk2eta)
 

On Fri, Jul 6, 2018 at 04:30 am, John wrote:
"and power level goes." should read  "and power level go up".
73, John (VK2ETA)


Re: Current Draw

John (vk2eta)
 

Hello Arvo,

It is logical to get higher current at the lower frequencies as the gain and power level goes. But a jump from 1.2A to 4A seems too much to be explained by extra gain/power output alone.

So I suspect that your SWR is also up significantly.

I would encourage you to built/buy an SWR meter as whatever power gets reflected from the antenna/feed-line ends-up as heat in the finals (not quite but close enough to illustrate the issue).

I am not sure if you modified the finals circuit, but if you have, a good measure to make is the output power over input power (by measuring the current drawn by the PA x Supply voltage). This gives an idea of the efficiency of the final stage where a value of 50% or more is generally considered acceptable. A low efficiency would also result in high PA current.

All the best,

73, John (VK2ETA)


Re: ?- How high SWR before smoke?

John (vk2eta)
 

Hello Walter,

If you can/want to use batteries that are higher than around 14V I would not recommend the RD16s. 

Speaking from personnel experience I managed to kill an RD16HHF1 when I forgot to reduce the voltage from a lithium 4S battery.

I have a switch to bypass 3 diodes to reduce the maximum voltage from 16.8 to under 15V for the PA.

They survived at low SWR but gave up when tuning as the SWR went up to 9+.

The advantage of the IRF510 is that even at 16V they produce a lot more power than at 12V.

So far I have not managed to kill the IRFs and I will stay with these for my portable rig.

73, John


Re: Elmer in Atlanta GA with working BITx40 RFSignals Kit working

Vic WA4THR
 

BTW, the "fix" for my blown Q13 was to lift the SMD part off the board and replace it with a standard 2N2222A with leads that I had on hand, just connecting the EBC leads to the same spots where the bad transistor was. I had to increase the RV1 gain after that, but the radio performed fine.

=Vic=


Re: Elmer in Atlanta GA with working BITx40 RFSignals Kit working

Vic WA4THR
 

Yes, I was using a 500W radio near the BitX40 and even though it was off and disconnected from an antenna, it fried Q13. So when I keyed PTT it would go into transmit but had no output. Another failure reported is that the relay (K1, I think) coil opens and it fails to switch to transmit at all.

An extra connector was provided with my BitX40 which was to allow using the analog VFO instead of the Raduino, I believe. It isn't needed for most applications.

=Vic=


Re: TX frequency? of uBitx at CWL and CWU mode #ubitxcw

Andy V. Borisenko
 

Ian, thanks for the file and the explanations!
all turned out well.
rw9rn(@)mail(dot)ru


Re: Programming error message

Mike Woods
 

Mark

There are quite a number of audio pop mods on ubitx.net!   I have yet to rewrite the page on the pop mod, but the item here (http://ubitx.net/2018/06/24/definitive-audio-pop-fix/) which is the best of the bunch and ubitx.net recommendation for a pop mod now is the one from the ubitx v4 board.  There is indeed an error with the numering on this excerpt from the µBITx circuit diagram.

This is just an excerpt from hfsignals.com, so the error originates with Ashhar Farhan VU2ESE!

I will write to him and see if we can get this corrected.   Thanks for pointing out the problem.  I will modify the text in the article so others don't run into the same problem.

73 Mike ZL1AXG ubitx.net

On 6/07/18 7:23 PM, mark bodlovich wrote:
Well kept trying and finally got it to work. Was able to get to get the cec software to load and then the original version as well. I think it was either settings in tools or maybe a bad download. But it's working again. What I did was replaced the Arduino nano board that was bad and loaded software. Also did the popmod with the 2n7000 mosfet which works well. Ignore the pin numbering of this mod on ubitx.net. it's wrong the mosfet pins are mislabeled and messed me up. They got pin 1 and 2 reversed. Trust but verify.


--
Mike Woods
mhwoods@...


Re: Programming error message

mark bodlovich
 

Well kept trying and finally got it to work. Was able to get to get the cec software to load and then the original version as well. I think it was either settings in tools or maybe a bad download. But it's working again. What I did was replaced the Arduino nano board that was bad and loaded software. Also did the popmod with the 2n7000 mosfet which works well. Ignore the pin numbering of this mod on ubitx.net. it's wrong the mosfet pins are mislabeled and messed me up. They got pin 1 and 2 reversed. Trust but verify.


Re: ?- How high SWR before smoke?

Walter Keen
 

For a backpacking radio, as I'm hoping to use my ubitx v3 for, can anyone see reasons to not move to RD16HHF1's or similar, particularly in my case for the reason that a larger passive heatsink out of my parts bin is slightly better to plan for in terms of battery power (weight vs space) , vs a fan or two running on the IRF510's


On Thu, Jul 5, 2018, 2:41 PM Jerry Gaffke via Groups.Io <jgaffke=yahoo.com@groups.io> wrote:
The RD16HHF1's do have some advantages.
Primary advantage is that the tab is connected to the source, not the drain,
so you can heatsink them directly to the chassis if you wish without using any electrical isolation.
But an IRF510 on a properly done heatsink can dissipate about the same power.

They are capable of more power out at 12v than the IRF510's, but you would have
to rewind some transformers to take advantage of that.

Others here will have other points to make.
For example, when operating at 12v the RD16HHF response might be a bit more linear.
Though if you are worried about spurious emissions the FET choice is not much of a factor here.

I doubt they would be any more robust than the IRF510's.
And I doubt it's worth the trouble.
On the other hand, could be fun to try.

> if you replace the output transistors to the RD16HHF1 that many are doing, the data sheet says a 20:1 SWR. 

Many here have demonstrated that the IRF510's are capable of dealing with much higher SWR's than 20:1.
No antenna connected means infinite SWR.
And the RD16HHF1 will have the same trouble getting heat transferred from die to tab that the IRF510 does.

Jerry

On Thu, Jul 5, 2018 at 12:45 pm, <trcarswell@...> wrote:
On Thu, Jul 5, 2018 at 12:40 pm, Ralph Mowery wrote:
RD16HHF1
At 4.75 each(RFParts) I may just do that!! ... are they "direct" replacements ???
(other than pinout)
Trip - KT4WO


Re: NAQCC article on ubitX by W7HD

w7hd.rh <w7hd.rh@...>
 

Yes all my own newsletters are here:
Ovarc and SIG newsletters by W7HD
and NAQCC newsletters are here:
NAQCC newsletters

Ron W7HD

On 07/05/2018 07:47 PM, Ashhar Farhan wrote:
Lovely newsletter and thanks for the encouraging review. Are the earlier newsletters online as well? Seems to be a very interesting journal.
73, f

On Fri, Jul 6, 2018 at 3:13 AM, w7hd.rh <w7hd.rh@...> wrote:
NAQCC July 2018 Newsletter
-- 
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter


-- 
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter


Re: Removing insulation from fine wires

AA9GG
 

In a pinch, I have used my lighter.  Quickly heat the area you want the strip to start at and then grip the wire firmly and give the insulation a pull.  Kids...don't try this at home.


On Thu, Jul 5, 2018 at 2:52 PM, Richard Spohn <wb2gxm@...> wrote:
I usually use a pair of strippers.  They usually use their teeth.

- Rich WB2GXM

On 7/3/18, Adrian <a.futrill@...> wrote:
> I used to use my teeth aswell until stripping wire one day broke a chunk of
> tooth off. Now use my thumb nail and finger
>
> Adrian
>
>
>
>
>
>






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


Re: Completed my QCX #ubitx

Ralph Mowery
 

If you install the AGC kit you can just use it for the S-meter.  Just tap off the first pin where the several jumper pins are for the delay. Works fine.


On Thu, Jul 5, 2018 at 9:48 PM, WD8WV <juddie.d.burgess@...> wrote:
Pat,

I haven't built the S-Meter circuit yet.  I had it turned on but it really isn't doing anything, don't know why sometimes I see what appears to be signal since there is no circuit in it yet.  I have to order the LM358 chip, everything else I have.  I was going to do the circuit with the LM386, which I have 3 of those from where I was building Pixie kits.  I bought several and have 3 new ones left.  Dr Lee, KD8CEC texted me on his blog that it would be better to use the LM358 chip.  I just received in the mail the TX/RX pop fix kit and the AGC kit that I read about.  Of course I have never done SM soldering, so don't know if I will be able to do this.
--
Judd, WD8WV
_._,_._,_


Re: ?- How high SWR before smoke?

ajparent1/KB1GMX <kb1gmx@...>
 

I'd keep any radio under 2:1 for extended period of time.  I also abuse that often
so far no fried finals.

However I did some testing today and the cable was on the floor so for 5 minutes
RF now power measured, oops.  Finals were barely warm and still happy.

The max temp for the part is 150C however that pushing things and its the
temperature of the hottest part of the die.  Hint water boils at 100C.  Keep
the finals under 70C and you should be good for heat.

The usual problem is there are resistive and reactive parts to a poor SWR and
the reactive part can drive the amp into oscillation and it will self destruct very fast
doing that.  The reason this is so is the Low pass filter is often not the frequency
it self oscillates at and the finals have DC power on them during RX if the are well
and fully oscillating they have power and an open antenna relay.  Bad situation.

Both IRF510 and the RD16HHF are subject to failure if the amp as a whole is not stable.
Ads claiming of infinite  SWR often do not count heating and other possible abuses
heaped on at the same time.  

Most resistive bridges unless pure crap are a 50 ohm load and can vary some
but not 2:1.  The crappy ones can go as far as 25 to 100 ohms (2:1).

FYI 2:1 is not high!   

What you are asking is how do I make my radio bullet proof and testing at home
is a starting point.  If you can't fry the finals there then likely it will work elsewhere.

Allison


Re: NAQCC article on ubitX by W7HD

Ashhar Farhan
 

Lovely newsletter and thanks for the encouraging review. Are the earlier newsletters online as well? Seems to be a very interesting journal.
73, f

On Fri, Jul 6, 2018 at 3:13 AM, w7hd.rh <w7hd.rh@...> wrote:
NAQCC July 2018 Newsletter
-- 
Ron W7HD - NAQCC#7587 OMISS#9898 KX3#6966 LinuxUser#415320
Editor OVARC newsletter



Re: Programming error message

Howard Fidel
 

It seems like last week when I downloaded 1.8.4. I had the same issue before that.

Howard

On 7/5/2018 9:51 PM, Jim Sheldon wrote:
Actually, 1.8.5 is the latest version of the IDE/compiler and some of the newer code won't compile on V1.8.4.

Jim, W0EB

On Jul 5, 2018, at 8:44 PM, Howard Fidel <sonic1@...> wrote:

Make sure you are using the latest release of the compiler, 1.8.4 and which code are you starting with?

On 7/5/2018 8:09 PM, mark bodlovich wrote:
Attempting ardino programming and getting this message si5351bx_setfreq was not declared in this scope. Is this normal or a problem. This is my first try at doing this.