Date   
Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

John Backo
 

Jerry is right.

This is a rather rare effect involving only a few nanos.
The use of a ceramic resonator would surely contribute to
the problem. The best solution is to replace the nano (maybe with a real one?).
The new one would most probably not have the problem...Alternatively,
one could build one's own version with a UNO (or other arduino) and check out how that works.

In any event, it comes down really to replacing with a better unit, or shielding
the offending signal away. I suspect many problems would disappear with
good shielding and short shielded leads, (which incidentally is among the
recommendations of Farhan also).

One could spend a lot of time figuring out just where the RFI is coming from.
but to what end? The important thing is to have a rig which communicates.
Finding a proper VFO is easy enough...but to each his own; some are intrigued by
just what is happening and are not satisfied until they know all. Fine enough.

john
AD5YE

Re: BITX QSO Afternoon/Night, Sunday, February 4, 3PM/7PM Local Time, 7277 kHz in North America, 7177 kHz elsewhere

Tom VE3THR
 

so looks like this afternoon was a bust, is there anybody going to stick around tonight 7pm / 0000Z ? There is a pile of AM broadcasters coming in up here tonight, playing around under 200 right now. When and where?

Re: RD16HHF1 in the uBITX #ubitx

John Backo
 

PA1FOX has done this, but I don't think he has
posted detailed results yet. (He has promised
to do so).

I have some, but have not gotten around to finding out what
they do. It looks very good, though.

john
AD5YE

Re: RD16HHF1 in the uBITX #ubitx

M Garza <mgarza896@...>
 

I am still waiting for mine.  Second order, last oder sat for over a week until I asked about them and was told they were out of stock...

So much for customer service.

Marco - KG5PRT 

On Feb 4, 2018 6:04 PM, "John Backo" <jabac@...> wrote:
PA1FOX has done this, but I don't think he has
posted detailed results yet. (He has promised
to do so).

I have some, but have not gotten around to finding out what
they do. It looks very good, though.

john
AD5YE



Re: RD16HHF1 in the uBITX #ubitx

John Backo
 

the Parts Place is a good place to get some. But they are now on back-order.

Also, it is noted that the prices have increased (~$US5.00 for RD16HHF1).
It looks like the market is catching up with what amateurs are realizing in
the capacity of these devices. Hi.

john
AD5YE

Re: RD16HHF1 in the uBITX #ubitx

M Garza <mgarza896@...>
 

That is where I placed my second order.  The other place was closer and I should have had them in a couple of days...  oh well.

Marco - KG5PRT 

On Feb 4, 2018 7:01 PM, "John Backo" <jabac@...> wrote:

the Parts Place is a good place to get some. But they are now on back-order.

Also, it is noted that the prices have increased (~$US5.00 for RD16HHF1).
It looks like the market is catching up with what amateurs are realizing in
the capacity of these devices. Hi.

john
AD5YE



Re: uBITX woes, feeling disheartened. #ubitx

William Londree
 

Arv,

I am glad you went to the trouble to post this. I have been puzzling how to do this myself because the switch connection did not make sense to me. Your sketches reflect the way I thought I should do it. Thanks for confirming for me.

73

Bill  W6SDI

Re: uBITX woes, feeling disheartened. #ubitx

Arv Evans
 

Bill

Glad my own uBITX work could be of value to someone else.

Arv
_-_




Sent from my Verizon, Samsung Galaxy smartphone

-------- Original message --------
From: William Londree <ventura_bill@...>
Date: 2/4/18 6:29 PM (GMT-07:00)
To: BITX20@groups.io
Subject: Re: [BITX20] uBITX woes, feeling disheartened.

Arv,

I am glad you went to the trouble to post this. I have been puzzling how to do this myself because the switch connection did not make sense to me. Your sketches reflect the way I thought I should do it. Thanks for confirming for me.

73

Bill  W6SDI

Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

Dave Bottom <ars.kd6az@...>
 


Genuine Nano with Quartz Crystals.  Replacing the Nano to remedy high frequency audio tone.

The official Arduino site says they are out of stock, however I found that the RobotDyn Nano ATmega328 (without headers installed) that has Quartz Crystals 12MHz USB and 16MHz ATmega328.
Without headers installed I can sacrifice the existing Nano without risking damage to the Radunio main PCB.

It is available on Amazon for $6.49.  Free Delivery if you have Amazon Prime.  

I just ordered one so I should be able to try it out replacing the current Nano on Tuesday before I head to Orlando for Hamcation. on Thursday morning.

Dave WI6R



On Sun, Feb 4, 2018 at 3:55 PM, John Backo <jabac@...> wrote:
Jerry is right.

This is a rather rare effect involving only a few nanos.
The use of a ceramic resonator would surely contribute to
the problem. The best solution is to replace the nano (maybe with a real one?).
The new one would most probably not have the problem...Alternatively,
one could build one's own version with a UNO (or other arduino) and check out how that works.

In any event, it comes down really to replacing with a better unit, or shielding
the offending signal away. I suspect many problems would disappear with
good shielding and short shielded leads, (which incidentally is among the
recommendations of Farhan also).

One could spend a lot of time figuring out just where the RFI is coming from.
but to what end? The important thing is to have a rig which communicates.
Finding a proper VFO is easy enough...but to each his own; some are intrigued by
just what is happening and are not satisfied until they know all. Fine enough.

john
AD5YE






--
73 Dave WI6R

Re: RD16HHF1 in the uBITX #ubitx

Nick VK4PP
 

NO cheap, but what about: https://www.minikits.com.au/eme210.htm
Like this:


73, Nick, VK4PLN

Re: RD16HHF1 in the uBITX #ubitx

Dave Bottom <ars.kd6az@...>
 

I got mine from RF Parts in 2 days around $5 each.  

I also got some of the RD16HVF1's (good through 2M) as well.  They were only a tiny bit more than the 30MHz HF parts (less than $6 as I recall).

I won't be trying these until I've had a chance to check out the driver stages 3.5-30 MHz, later this month when I return from a couple of trips.

Dave WI6R

On Sun, Feb 4, 2018 at 3:32 PM, Nick VK4PLN <nickpullen@...> wrote:
HI Group.
I have been searching and reading topics with regards to using the RD16HHF1 in the uBITX.
So far I have only been able to find suggesstions, but no actual implementations...

I was testing my uBITX and getting 9w on 40m but only 1W at 10m...
Would love to have 5w + higher up.

Can anyone provide more info/help?

Thanks.
73, Nick VK4PLN




--
73 Dave WI6R

Re: RD16HHF1 in the uBITX #ubitx

David McGough
 

Oh, just bite the bullet and go QR-Oh-Oh-Oh!! HiHi

https://www.rfparts.com/blf188xr-amp.html

73, David KB4FXC

On Sun, 4 Feb 2018, Dave Bottom wrote:

I got mine from RF Parts in 2 days around $5 each.

I also got some of the RD16HVF1's (good through 2M) as well. They were
only a tiny bit more than the 30MHz HF parts (less than $6 as I recall).

I won't be trying these until I've had a chance to check out the driver
stages 3.5-30 MHz, later this month when I return from a couple of trips.

Dave WI6R

On Sun, Feb 4, 2018 at 3:32 PM, Nick VK4PLN <nickpullen@...> wrote:

HI Group.
I have been searching and reading topics with regards to using the
*RD16HHF1* in the uBITX
*.*So far I have only been able to find suggesstions, but no actual
implementations...

I was testing my uBITX and getting 9w on 40m but only 1W at 10m...
Would love to have 5w + higher up.

Can anyone provide more info/help?

Thanks.
73, Nick VK4PLN



Re: RD16HHF1 in the uBITX #ubitx

John Backo
 

Well, it's nice. But you still have to design the amp.

And blowing up one of them is a whole lot more expensive. Hi.
Let's see...I could get about 42 RD16HXXX devices for every one
of these. And if I designed the rig properly, It should give out
over 400W.

Incidentally, the fact that prices are rising means that counterfeits
can't be far behind. It is so easy to take any MOSFET and erase
the number to claim it is something else. Caveat Emptor.

john
AD5YE

Re: #ubitx-help Strong Audio Tones in and outside audio receive passband #ubitx-help

John Backo
 

RoboDyn is a good outfit...even though they have little
to do with the Arduino outfit. Ought to work well if you
get a genuine RoboDyn unit.

It has a CH340 interface and micro B USB connector
and is black like the SainSmart units.

john
AD5YE

RD16HHF1 in the uBITX #ubitx

K9HZ <bill@...>
 

Check this socket trick below that someone else posted.  Then fold the RD device over and screw it to the case.  Tab is not hot any more.  Re-bias.

 

 

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

Like us on Facebook! facebook icon

 

 

email:  bill@...

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of K9HZ
Sent: Thursday, February 01, 2018 7:59 AM
To: BITX20@groups.io
Subject: [SPAM] Re: [SPAM] Re: [BITX20] Replacing the PA section on Bitx 40

 

I really like that!   If you fold the RD16 over you could use a heat sink out the back…

 

 

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

Like us on Facebook! facebook icon

 

 

email:  bill@...

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Raj vu2zap
Sent: Thursday, February 01, 2018 4:24 AM
To: BITX20@groups.io
Subject: [SPAM] Re: [BITX20] Replacing the PA section on Bitx 40

 

Here is how I made the socket and mounted the RDD16

Note the RDD is reversed and  then the gate is actually soldered to the IRF gate line which goes behind the FET.
Now I can use either of them..

You will need to think of a heat sink plate that fits this way!

Emacs!

At 01/02/2018, you wrote:

Why replace everything?  You can probably put it in place of the 510 (making sure it is pinned correctly, of course). Â
I am waiting on a pair, myself, that I will be stuffing into the ubitx.   I want to even out the power output.  I will also try a resistor/capacitor in parallel, in series with the gate, to try and even out the frequency response.  I am thinking 4.7 ohm & 4700pf.  I will also try 6.8 ohm & 4700pf.  Depends on how flat I can get the output.

Marco - KG5PRTÂ

On Jan 31, 2018 10:12 PM, "James Lawrie" <lawriejk@...> wrote:

Hello,

My shipment of replacement RF Mosfets have arrived and I want to replace the on board PASection with one based on the RD16HHF1. It will be a separate small PCB based on the reference design shown in the data sheet. I need help from the professionals here as to where to attach the new PA board.

I know it would be somewhere after the 2N2219A driver, and I want to remove all bypassed SMTs and or other parts from the Bitx board in that area. If you have a pretty good idea could you please let me know, and possibly a drawing if you could. This should keep me busy and off the forum for a while.

Re: #ubitx Current draw when transmitting? #ubitx

Ghericoan
 

Touching back on this, it's feld-hell's lower duty cycle that was causing the lower current draw.
--
----------
N5WLF, Greggory (or my nickname, Ghericoan)
General Class, Digital Radio Hobbyist

Re: BitX40 v1.27.7 SPOT mode

Vic WA4THR
 

Yes it does, I never would have figured that out! I wanted to include that appropriate CAL value in my version of your sketch to pretty much get it calibrated correctly when restored to those settings.

Allard, I continue to be impressed and amazed at your software. Thanks so much for this service you have provided.

73, =Vic=
WA4THR

Re: RD16HHF1 in the uBITX #ubitx

Jerry Gaffke
 

Somebody already did the amp for you:
    http://w6pql.com/1_kw_sspa_for_1_8-54_mhz.htm#rfdeck

Unfortunately, it requires 2 or 3 watts going in for full output.
So we still have to bring the uBitx up a bit from 1W on 30m.

Jerry, KE7ER


On Sun, Feb 4, 2018 at 06:39 pm, John Backo wrote:
Well, it's nice. But you still have to design the amp.

Re: [SPAM] Re: [BITX20] Higher voltage for Bitx40 Final

K9HZ <bill@...>
 

Did you re-bias the 510s when you changed the PA voltage?  If not, theoretically this could happen if the bias were set right on the edge of class “C” operation.

 

 

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

Like us on Facebook! facebook icon

 

 

email:  bill@...

 

From: BITX20@groups.io [mailto:BITX20@groups.io] On Behalf Of Jerry Gaffke via Groups.Io
Sent: Sunday, February 04, 2018 3:22 PM
To: BITX20@groups.io
Subject: [SPAM] Re: [BITX20] Higher voltage for Bitx40 Final

 

11.5v should be fine, make sure it is still 11.5 when PTT is pressed.
Quiescent IRF510 drain current changing somewhat as they get warm is normal

The drop from 6w to 4w when V+ to the IRF510's is bumped from 12v to 24v is very weird.
Have you tried simply switching the IRF510 V+ between the two with exactly the same setup, same instrumentation?
Hate to say it, but my first guess would be pilot error.

On Sun, Feb 4, 2018 at 01:10 pm, Vic WA4THR wrote:

Just finished building my BitX40 after playing with the circuit for a few weeks. Early tests on mine suggested that using the small booster I have and raising the PA voltage from around 14 to 24 did seem to increase the power by the square of the voltage ratio, so matching these experiences. Admittedly, I was trying to read this on a 450w dummy load meter, and yelling into the mic, s not very accurate. So this past weekend I did get a QRP wattmeter that could read 30w as full scale and get a better idea of how much I am increasing.

However, now when I apply 24v to the final the power output actually drops from 6w to 4w! The only significant cuircuit difference is that I am now running the other 2 power connections (main board and Raduino) through a 7812 regulator, and since it is not getting quite enough to regulate to 12v, it is delivering about 11.5v to those boards, which I assumed was just a bit safer. The voltage booster is not dropping voltage under load, so I am befuddled as to why the power actually drops when I apply the higher voltage. I did recheck the PA bias and raised it up closer to 100ma, but I notice it slowly increases from wherever it is set if I continue to hold the PTT. Any ideas? Perhaps I should short the input to the output of the little 7812 to see if that actually had an effect.

Re: RD16HHF1 in the uBITX #ubitx

Nick VK4PP
 

I just wanna be able to output 5-10w on 28mhz.... not 1w... My QTH is pretty remote and without "decent" power, I wont get any contacts on >7mhz...

Might have to seriously consider an FT817, but the price.... lol.