Date   
Re: Anyone (US Only for now) need a uBITX Raduino repaired? #ubitx

Christopher Miller
 

Sweet, now i just need a ubitx

Re: Second batch of uBITX shipping? #ubitx

Leland Lannoye
 

Klinkt mir, dass der Herr Walter Ulbricht beherrscht die deutsche Kontrolle jetzt! . Jawohl, Komrad!

On 2/5/2018 10:39 AM, Art Howard wrote:

On 5 Feb 2018 6:43 am, "dj0hf" <dj0hf@...> wrote:
You couldn't make it up - My ubitx took just 24 hours to get from India to Germany with DHL and has now sat for 3 days (so far) at the customs in Leipzig and they are refusing to release it without a detailed description of exactly what is inside the package.
I've sent them a description and a link to the hfsignals web-site. So now it's just wait and see what happens. Maybe I'll get it eventually

Ian
DJ0HF/G3ULO




Virus-free. www.avg.com

Re: whistles in receive

Jerry Gaffke
 

One of my earliest memories at about 3 years of age, maybe less, is being fascinated
by the console tube radio we had in the living room.
Peering around in back, face pressed against the wall, trying to see what was inside
and figure out how it worked. 
My elders teasing me, telling me about all the little people tucked inside. 

Younger hams in the states will only think of Ham Radio Outlet, our local retail chain.
Here's the real HRO:  http://www.radioblvd.com/National%20HRO.htm
And a choice quote:

The original published story for the origin of  the HRO designation related that all of National's inter-departmental paperwork for the receiver project was stamped "H.R.O." which stood for "Hellva Rush Order" since the time table for the receiver development was a "rush order" type of project. For many years this was the story related in National advertising and it sounded believable. However, after James Millen left National in 1939, he corrected the story as follows:

The original development paperwork was usually marked "H.O.R." - for "Hell Of a Rush" but during the finalization phase, someone at National decided they didn't want their new receivers to be referred to as "HORs" so the letters were rearranged and became HRO - then the "Hellva Rush Order" story created to explain the HRO designation.

Well,...that's Millen's story anyway.   


On Mon, Feb 5, 2018 at 07:40 am, Ashhar Farhan wrote:
The warm smells of an HRO steaming up... is there any hotroding one can do to these rigs?
- f
 

At long last!!

David Robertson
 

I finally got my paypal e-mail indicating my uBITX radio is shipping. As for many others it has been a long wait. Looking forward for the DSL package at my door

73
Dave KD1NA 

Re: At long last!!

Vince Vielhaber
 

DSL? Coming via internet connection? :)

Do you recall your order date?

Vince.

On 02/05/2018 11:39 AM, David Robertson wrote:
I finally got my paypal e-mail indicating my uBITX radio is shipping. As
for many others it has been a long wait. Looking forward for the DSL
package at my door

73
Dave KD1NA

Re: At long last!!

bill richardson
 

Great news Dave.. got mine last week and it’s built in a case and firmware updated..

Good seeing you at BBQCon a few weeks ago.

73 Bill Ng1p

On Feb 5, 2018, at 11:39 AM, David Robertson <kd1na363@...> wrote:

KD1NA

Re: At long last!!

Leland Lannoye
 

Mine was December 20, 2017.

On 2/5/2018 11:46 AM, Vince Vielhaber wrote:
DSL? Coming via internet connection?  :)

Do you recall your order date?

Vince.



On 02/05/2018 11:39 AM, David Robertson wrote:
I finally got my paypal e-mail indicating my uBITX radio is shipping. As
for many others it has been a long wait. Looking forward for the DSL
package at my door

73
Dave KD1NA
---
This email has been checked for viruses by AVG.
http://www.avg.com

Re: Second batch of uBITX shipping? #ubitx

KK6VLV
 

Just got email about 6 hours ago with the tracking number.
I ordered on December 17. I am in USA.
Estimated delivery date from DHL website using the tracking number is Friday February 9.
--
KK6VLV

Re: whistles in receive

Jack Purdum
 

One can get carried away, however...

Inline image
Jack, W8TEE


From: Leland Lannoye <wa9aoe@...>
To: BITX20@groups.io
Sent: Monday, February 5, 2018 10:49 AM
Subject: Re: [BITX20] whistles in receive

There have been numerous articles in QST over the years on rebuilding these old rigs.  I found an article which I saved somewhere on building transistor substitutes for the tubes.  you could build them on small perf boards and set up a set of wires that corresponded to the pin out on the tubes.  At one time, someone was making modules to replace all the low power and receiving tubes on the Collins S line.  That was at least 40 years ago.  I don't do well on a lot of these tiny connections anymore due to age and aging eyes, but my history skills are still largely intact.
Lee, WA9AOE
PS: Still awaiting shipment on my Bitx.
On 2/5/2018 10:40 AM, Ashhar Farhan wrote:
The warm smells of an HRO steaming up... is there any hotroding one can do to these rigs?
- f

On 5 Feb 2018 12:02 am, "Leland Lannoye" <wa9aoe@...> wrote:
I am sitting here reading some of this information and studying the new technology.  When I was young (at leas 50 years ago), solid state technologies were either in their infancy or still a dream.  Our rigs were two pieces of equipment, a receiver and a transmitter with a variety of accessories.

Most of our receivers for those of us who were not well heeld in the financial area were of the single conversion genre with an if frequency of 455 kHz.  With little preselection capability, this relegated the ham bands 20 mtrs and above useless with hetrodyne images from frequencies 910 kHz either above or below the desired reception point. There, in that day, were three remedies to fix this. The first two were:

    1.)  add a really selective high gain preselector to tune the offending images out

    2.)  raise the if to something on the order of 1600 kHz which left bandpass selectivity at a substantial disadvantage.

The third option, and the most expensive in its day was double (or, even triple) conversion.  If  you were able to pay the 1958 price of over $300, you were in and there were few difficulties thereafter until the receiver aged and developed some bad shield grounds or worse.  The second or third conversion local oscillator would provide a cornu copia of birdies of one type or another. These included signals that were always there, I know the newer designs with balanced mixers and the like have few of these problems, but, it is worth considering.

An aging ham from way back.


Lee, WA9AOE


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This email has been checked for viruses by AVG.
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Re: whistles in receive

chris gress <Chrisg0wfh@...>
 

And to think I have 1 old ICOM I'm to poor for any else lol

On 5 Feb 2018 18:35, "Jack Purdum via Groups.Io" <jjpurdum=yahoo.com@groups.io> wrote:
One can get carried away, however...

Inline image
Jack, W8TEE


From: Leland Lannoye <wa9aoe@...>
To: BITX20@groups.io
Sent: Monday, February 5, 2018 10:49 AM
Subject: Re: [BITX20] whistles in receive

There have been numerous articles in QST over the years on rebuilding these old rigs.  I found an article which I saved somewhere on building transistor substitutes for the tubes.  you could build them on small perf boards and set up a set of wires that corresponded to the pin out on the tubes.  At one time, someone was making modules to replace all the low power and receiving tubes on the Collins S line.  That was at least 40 years ago.  I don't do well on a lot of these tiny connections anymore due to age and aging eyes, but my history skills are still largely intact.
Lee, WA9AOE
PS: Still awaiting shipment on my Bitx.
On 2/5/2018 10:40 AM, Ashhar Farhan wrote:
The warm smells of an HRO steaming up... is there any hotroding one can do to these rigs?
- f

On 5 Feb 2018 12:02 am, "Leland Lannoye" <wa9aoe@...> wrote:
I am sitting here reading some of this information and studying the new technology.  When I was young (at leas 50 years ago), solid state technologies were either in their infancy or still a dream.  Our rigs were two pieces of equipment, a receiver and a transmitter with a variety of accessories.

Most of our receivers for those of us who were not well heeld in the financial area were of the single conversion genre with an if frequency of 455 kHz.  With little preselection capability, this relegated the ham bands 20 mtrs and above useless with hetrodyne images from frequencies 910 kHz either above or below the desired reception point. There, in that day, were three remedies to fix this. The first two were:

    1.)  add a really selective high gain preselector to tune the offending images out

    2.)  raise the if to something on the order of 1600 kHz which left bandpass selectivity at a substantial disadvantage.

The third option, and the most expensive in its day was double (or, even triple) conversion.  If  you were able to pay the 1958 price of over $300, you were in and there were few difficulties thereafter until the receiver aged and developed some bad shield grounds or worse.  The second or third conversion local oscillator would provide a cornu copia of birdies of one type or another. These included signals that were always there, I know the newer designs with balanced mixers and the like have few of these problems, but, it is worth considering.

An aging ham from way back.


Lee, WA9AOE


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This email has been checked for viruses by AVG.
http://www.avg.com





Virus-free. www.avg.com


Re: LTSpice simulation of uBitx Power Amp

Jerry Gaffke
 

Have now uploaded version two of the simulation:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.pdf

Has the following changes:
Quiescent drain current reduced to 10ma on both.
Added a switching mechanism to show response at both 7 and 30 mhz with a single run.

Observations:

Power out on WA2EBY is still much lower at 30mhz than he reported in his QST article.
Input impedance at 30mhz falls to 12 ohms, which is the primary factor here.
If Vin source impedance is reduced from 50 ohms to 0 ohms, then 30mhz output exceeds 7mhz output.
 
Removing C3 increases output a bit at both 7 and 30mhz 

L3 helps make the exciter see a resistive load, but doesn't help much.
 
I'm moving on to other things.
Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz
Here's my notes on how I got the WA2EBY inductor values, includes a python script for single layer coils:

# http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html
#   Single layer coils, wheeler formula:  Henrys = 0.001 * N**2* R**2 / (228R + 254L)
#   where N is number of turns, R is radius in meters, L is length in meters (>0.8r)
def h(n, d, w): # turns, form diameter in inches, wire diameter in inches
   length = w*n/39.37 # length of coil in meters, assuming close wound
   radius = (d+w)/2/39.37 # radius of coil from middle of wire in meters
   henries = 0.001 * n**2* radius**2 / (228*radius + 254*length)
   return(henries)

L1, L2   9-1/2 turns #24 enameled wire, closely wound 0.25-in. ID       >>> h(9.5, 0.25,  0.02):  5.285e-07 = 0.5285uH
L3       3-1/2 turns #24 enameled wire, closely wound 0.190-in. ID      >>> h(3.5, 0.190, 0.02):  8.222e-08 = 0.0822uH
T1       10 bifilar turns #24 enameled wire on an FT-50-43 core  uH=(AL*Turns**2)/1000  AL=440     (440*100)/1000 = 44uH/winding
T2       10 bifilar turns #22 enameled wire on two stacked FT-50-43 cores. AL doubles (880*100)/1000 = 88uH/winding
T3       Pri 2 turns, sec 3 turns #20 Tefloncovered wire on BN-43-3312 balun core. AL=7000    (7000*4)/1000=28uH, (7000*9)/1000=63uH

Jerry,  KE7ER



On Sun, Feb 4, 2018 at 10:21 pm, Jerry Gaffke wrote:

I've now uploaded an LTSpice simulation schematic file that allows easy comparison of the uBitx and WA2EBY finals,
also a pdf version for those who have not installed LTSpice:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.pdf

I haven't played with it too much, haven't taken any notes.
But here's what I think I'm seeing:

The WA2EBY does perform better. 
Power in is about the same between the two, power out from the WA2EBY is generally a factor of 3 greater.
The gates on the WA2EBY have nice sine waves, the uBitx is quite distorted there by capacitive loading.
Input impedance on both is about 50 ohms at 7mhz, both go down to about 12 ohms at 30mhz,
as determined by monitoring the voltage after the 50 ohm source impedance resistor.
Both show a 4x power increase when switching from 30mhz to 7mhz, more than I would
have expected on the WA2EBY, perhaps I have some wrong values on the inductors?
The IRF510 model assumes worst case for Rds(on) and Qgate, though I doubt that's just too far off.

Jerry, KE7ER

Re: LTSpice simulation of uBitx Power Amp

Diver Martin <diver.martin@...>
 

> Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz

To quote George E.P. Box, "All models are wrong, but some are useful."

Spice models are just that, models.  They're rarely right.  But they can tell you useful things about some of the mechanics of what's going on inside the system.

On Mon, Feb 5, 2018 at 10:40 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Have now uploaded version two of the simulation:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.pdf

Has the following changes:
Quiescent drain current reduced to 10ma on both.
Added a switching mechanism to show response at both 7 and 30 mhz with a single run.

Observations:

Power out on WA2EBY is still much lower at 30mhz than he reported in his QST article.
Input impedance at 30mhz falls to 12 ohms, which is the primary factor here.
If Vin source impedance is reduced from 50 ohms to 0 ohms, then 30mhz output exceeds 7mhz output.
 
Removing C3 increases output a bit at both 7 and 30mhz 

L3 helps make the exciter see a resistive load, but doesn't help much.
 
I'm moving on to other things.
Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz
Here's my notes on how I got the WA2EBY inductor values, includes a python script for single layer coils:

# http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html
#   Single layer coils, wheeler formula:  Henrys = 0.001 * N**2* R**2 / (228R + 254L)
#   where N is number of turns, R is radius in meters, L is length in meters (>0.8r)
def h(n, d, w): # turns, form diameter in inches, wire diameter in inches
   length = w*n/39.37 # length of coil in meters, assuming close wound
   radius = (d+w)/2/39.37 # radius of coil from middle of wire in meters
   henries = 0.001 * n**2* radius**2 / (228*radius + 254*length)
   return(henries)

L1, L2   9-1/2 turns #24 enameled wire, closely wound 0.25-in. ID       >>> h(9.5, 0.25,  0.02):  5.285e-07 = 0.5285uH
L3       3-1/2 turns #24 enameled wire, closely wound 0.190-in. ID      >>> h(3.5, 0.190, 0.02):  8.222e-08 = 0.0822uH
T1       10 bifilar turns #24 enameled wire on an FT-50-43 core  uH=(AL*Turns**2)/1000  AL=440     (440*100)/1000 = 44uH/winding
T2       10 bifilar turns #22 enameled wire on two stacked FT-50-43 cores. AL doubles (880*100)/1000 = 88uH/winding
T3       Pri 2 turns, sec 3 turns #20 Tefloncovered wire on BN-43-3312 balun core. AL=7000    (7000*4)/1000=28uH, (7000*9)/1000=63uH

Jerry,  KE7ER



On Sun, Feb 4, 2018 at 10:21 pm, Jerry Gaffke wrote:

I've now uploaded an LTSpice simulation schematic file that allows easy comparison of the uBitx and WA2EBY finals,
also a pdf version for those who have not installed LTSpice:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.pdf

I haven't played with it too much, haven't taken any notes.
But here's what I think I'm seeing:

The WA2EBY does perform better. 
Power in is about the same between the two, power out from the WA2EBY is generally a factor of 3 greater.
The gates on the WA2EBY have nice sine waves, the uBitx is quite distorted there by capacitive loading.
Input impedance on both is about 50 ohms at 7mhz, both go down to about 12 ohms at 30mhz,
as determined by monitoring the voltage after the 50 ohm source impedance resistor.
Both show a 4x power increase when switching from 30mhz to 7mhz, more than I would
have expected on the WA2EBY, perhaps I have some wrong values on the inductors?
The IRF510 model assumes worst case for Rds(on) and Qgate, though I doubt that's just too far off.

Jerry, KE7ER




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

Re: LTSpice simulation of uBitx Power Amp

K9HZ <bill@...>
 

Mod ls are Starting points without spending $. 


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 Feb 5, 2018, at 12:47 PM, Diver Martin <diver.martin@...> wrote:

> Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz

To quote George E.P. Box, "All models are wrong, but some are useful."

Spice models are just that, models.  They're rarely right.  But they can tell you useful things about some of the mechanics of what's going on inside the system.

On Mon, Feb 5, 2018 at 10:40 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
Have now uploaded version two of the simulation:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX_2.pdf

Has the following changes:
Quiescent drain current reduced to 10ma on both.
Added a switching mechanism to show response at both 7 and 30 mhz with a single run.

Observations:

Power out on WA2EBY is still much lower at 30mhz than he reported in his QST article.
Input impedance at 30mhz falls to 12 ohms, which is the primary factor here.
If Vin source impedance is reduced from 50 ohms to 0 ohms, then 30mhz output exceeds 7mhz output.
 
Removing C3 increases output a bit at both 7 and 30mhz 

L3 helps make the exciter see a resistive load, but doesn't help much.
 
I'm moving on to other things.
Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz
Here's my notes on how I got the WA2EBY inductor values, includes a python script for single layer coils:

# http://info.ee.surrey.ac.uk/Workshop/advice/coils/air_coils.html
#   Single layer coils, wheeler formula:  Henrys = 0.001 * N**2* R**2 / (228R + 254L)
#   where N is number of turns, R is radius in meters, L is length in meters (>0.8r)
def h(n, d, w): # turns, form diameter in inches, wire diameter in inches
   length = w*n/39.37 # length of coil in meters, assuming close wound
   radius = (d+w)/2/39.37 # radius of coil from middle of wire in meters
   henries = 0.001 * n**2* radius**2 / (228*radius + 254*length)
   return(henries)

L1, L2   9-1/2 turns #24 enameled wire, closely wound 0.25-in. ID       >>> h(9.5, 0.25,  0.02):  5.285e-07 = 0.5285uH
L3       3-1/2 turns #24 enameled wire, closely wound 0.190-in. ID      >>> h(3.5, 0.190, 0.02):  8.222e-08 = 0.0822uH
T1       10 bifilar turns #24 enameled wire on an FT-50-43 core  uH=(AL*Turns**2)/1000  AL=440     (440*100)/1000 = 44uH/winding
T2       10 bifilar turns #22 enameled wire on two stacked FT-50-43 cores. AL doubles (880*100)/1000 = 88uH/winding
T3       Pri 2 turns, sec 3 turns #20 Tefloncovered wire on BN-43-3312 balun core. AL=7000    (7000*4)/1000=28uH, (7000*9)/1000=63uH

Jerry,  KE7ER



On Sun, Feb 4, 2018 at 10:21 pm, Jerry Gaffke wrote:

I've now uploaded an LTSpice simulation schematic file that allows easy comparison of the uBitx and WA2EBY finals,
also a pdf version for those who have not installed LTSpice:
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.asc
    https://groups.io/g/BITX20/files/KE7ER/WA2EBYandUBITX.pdf

I haven't played with it too much, haven't taken any notes.
But here's what I think I'm seeing:

The WA2EBY does perform better. 
Power in is about the same between the two, power out from the WA2EBY is generally a factor of 3 greater.
The gates on the WA2EBY have nice sine waves, the uBitx is quite distorted there by capacitive loading.
Input impedance on both is about 50 ohms at 7mhz, both go down to about 12 ohms at 30mhz,
as determined by monitoring the voltage after the 50 ohm source impedance resistor.
Both show a 4x power increase when switching from 30mhz to 7mhz, more than I would
have expected on the WA2EBY, perhaps I have some wrong values on the inductors?
The IRF510 model assumes worst case for Rds(on) and Qgate, though I doubt that's just too far off.

Jerry, KE7ER




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

Re: LTSpice simulation of uBitx Power Amp

Jerry Gaffke
 

I suppose.
The LTSpice model of the IRF510 does assume worst case, perhaps that is part of it.
But the WA2EBY model is off from the performance reported in the QST article by more than I would expect when operating at 30mhz.
And the uBitx models pretty close to the performance we actually get.

Regardless, looks like we'd do well to hack the uBitx to use something closer to the WA2EBY circuit.
And if that doesn't give the required performance at 30mhz, then drive the IRF510's from a lower impedance source.
LTSpice is whispering to me that if driven hard enough, the IRF510's will do 30W at 30mhz.

Jerry, KE7ER


On Mon, Feb 5, 2018 at 10:47 am, Diver Martin wrote:
> Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz
 
To quote George E.P. Box, "All models are wrong, but some are useful."
 
Spice models are just that, models.  They're rarely right.  But they can tell you useful things about some of the mechanics of what's going on inside the system.
 

BITX40 Low audio volume with 8.5V to board/Raduino

Steve
 

Hi gang.  So I thought I'd get stupid and add complexity where none is needed.  Radio: BTX40, 1.27.7 'ware, basic hardware mods.  I put a buck converter between the power switch and the leads that feed B+ to the board and the Raduino- thinking I'll save some power, or be easier on those parts, temp-wise- and adjusted the voltage to 8.5.  Now, the previously robust speaker output is much diminished, and the volume control has no effect after about half it's initial rotational travel.  If I adjust the B/C up to maximum- 11.7V- still low volume. If I de-fuse the B/C and jumper around it (note that the led on the b/c lights up when I do this) and use the bench power supply to reduce the V in to 8.5V, the audio is a bit lower than with 13.8V, but the volume control functions as normal.  Note that the radio and all the wiring is still spread out over the bench....Removing the B/C is the easy solution, but I'm just wondering.....Aloha, Steve WH6ST

Re: LTSpice simulation of uBitx Power Amp

Diver Martin <diver.martin@...>
 

Looking at the schematic, has anyone tried changing the turns ratio on T10, or monkeying with the preamp?  It would lower the drive level, but also lower the drive impedance.  One might also increase the resistance slightly of R90/93 (increasing the drive bias of the preamp stage, dangerous) or lowering the emitter degeneration resistors (R941, 911, 942 and 96) from 22 ohms to something like 10 ohms (Degeneration is useful here though, it provides linearity to the amplifier).

I use IRF530's in a different amplifier design that puts out 50W with about 3W in at 30MHz.  Not sure what the preamp stage is rated for, I'd assume ~0.5 to 1W tops.

On Mon, Feb 5, 2018 at 11:29 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote:
I suppose.
The LTSpice model of the IRF510 does assume worst case, perhaps that is part of it.
But the WA2EBY model is off from the performance reported in the QST article by more than I would expect when operating at 30mhz.
And the uBitx models pretty close to the performance we actually get.

Regardless, looks like we'd do well to hack the uBitx to use something closer to the WA2EBY circuit.
And if that doesn't give the required performance at 30mhz, then drive the IRF510's from a lower impedance source.
LTSpice is whispering to me that if driven hard enough, the IRF510's will do 30W at 30mhz.

Jerry, KE7ER


On Mon, Feb 5, 2018 at 10:47 am, Diver Martin wrote:
> Let me know if anybody figures out why my model of the WA2EBY amp shows the output to be so much lower at 30mhz
 
To quote George E.P. Box, "All models are wrong, but some are useful."
 
Spice models are just that, models.  They're rarely right.  But they can tell you useful things about some of the mechanics of what's going on inside the system.
 




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

IRF510 more Volts = more W? #ubitx

Jim McKay
 

I could not find the answer on the forum but I apologize now if it has already been answered. Noting the need for an improved heatsink/s. Has anyone done any experiments with increasing the PA voltage  (brown wire) up 24V to see if the output significantly increases. I did this with a BITX40 for a significant increase in W.

Jim

 

 

Re: At long last!!

David Robertson
 

Sorry about that. My order date was December 16, 2017. Hope the rest of you that are waiting I hope you get your radio soon
73
Dave KD1NA

--
Dave Robertson KD1NA

Re: Diy oscilloscope #parts

Joe Puma
 

I would like to get on of these and a real one not a knockoff but I’m trying to find one build already. I’m not afraid to build the kit but I’d rather get it built at the moment. 

I’m also looking for a RF millivolt reader. I want to check some RF voltage points on my Yaesu for starters. It’s a good introduction for me to get started with using test equipment. 


Joe
KD2NFC 



On Feb 1, 2018, at 4:54 PM, Doug W <dougwilner@...> wrote:

On Thu, Feb 1, 2018 at 01:40 pm, Jerry Gaffke wrote:
Very nice of JYE-Tech to release all that, would be good karma to support them by avoiding clones.
It's more likely to work, and you are more likely to get support if it doesn't.
They specifically mention the SainSmart clone up on their website.
To build on Jerry's point, https://www.jyetech.com/Products/LcdScope/e138.php is worth a read.  I've been looking at these kits off and on and had no idea. 
I've purchased SainSmart filament in the past, never again.

Re: IRF510 more Volts = more W? #ubitx

Doug W
 

If you access the list from https://groups.io/g/BITX20/topics instead of an email client you will have access to the search function.  Searching for irf510 24v will yield enough reading to keep you busy for a while.  Best of luck with your experimenting.  Should your quest result in releasing the magic smoke, fear not, a search for irf510 replacement will get you back to good.