? ? ??Thanks Mike, good weekend.73? ? ? Jorge
Search shows lots on WA2EBY amp.
Mike, WA6ISP
?
On 7/1/2017 7:15 AM, Jorge Luiz
Fenerich wrote:
? ? ? ? ?Hello KC8WBK, I
would like to see the schematic of your linear, please
send a copy to me? Thank you very much.
??
--
?
73 de Jorge PY2PVT
? Campinas SP
? GG67MD
-- ? 73 de Jorge PY2PVT
? Campinas SP
? GG67MD
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Hi Rich,
The "part 2" of the QST article on the WA2EBY amp notes that you can set a resistor pad up for 5 W input to the original 1 W input that WA2EBY's amp is designed for, but you waste 4 W in that pad so the amp is still driven with 1 W and you still get the designed ~20 W out using 13.8 V DC. ?Are you making a more extensive modification to get more power out?
(Of course, you can get more out of the amp with 28 V drive, up to 70 W with appropriate heat sinking - see Figure 7 of the Part 2 article available at ).
It seems also important to note that the amp is designed for CW/SSB operation only and not digital, because you just can't sink away the heat and not destroy the finals. ?In the thermal calculation section, he writes:
"These [thermal] calculations make it clear that the amplifier should not be used for AM, FM or any other continuous-carrier operation. The amplifier should be used only for CW and SSB operation where the duty cycle is significantly reduced."
73
Phil W1PJE
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Re: Raduino v1.17 with FINE TUNE capability released
On Sat, Jul 1, 2017 at 07:56 am, Allard PE1NWL wrote:
OK, point taken!
I think we can improve this in the next version.
Great! Thanks! ? -- John - WA2FZW
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Re: Raduino v1.17 with FINE TUNE capability released
On Sat, July 1, 2017 16:21, N8DAH wrote: I too would like to see at least the 2nd say 7.123.45. OK, point taken! I think we can improve this in the next version. 73 Allard PE1NWL
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The manual is attached to this post.? Page 42 has a schematic of the amplifier module, but I did not see a complete schematic for the entire amp.? More information is available at
Note that my amp is an older version which is no longer sold.
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Search shows lots on WA2EBY amp.
Mike, WA6ISP
?
On 7/1/2017 7:15 AM, Jorge Luiz
Fenerich wrote:
toggle quoted message
Show quoted text
? ? ? ? ?Hello KC8WBK, I
would like to see the schematic of your linear, please
send a copy to me? Thank you very much.
??
--
?
73 de Jorge PY2PVT
? Campinas SP
? GG67MD
|
Re: Raduino v1.17 with FINE TUNE capability released
I too would like to see at least the 2nd say 7.123.45.
?
?
?
?
David
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? ? ? ? ?Hello KC8WBK, I would like to see the schematic of your linear, please send a copy to me? Thank you very much. ?? --
? 73 de Jorge PY2PVT
? Campinas SP
? GG67MD
|
So far, I am impressed.? I was able to qso with two stations that previously could not hear me on 5W.? It might have been better propagation that day, but I think that this configuration is similar to running barefoot with a commercial rig.
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I am in the process of building a WA2EBY amp from a set of boards I bought from Sunil's store on EBay (also came with a pair of IRF510's and a rotary switch). This is the amp the HF Packer was based on. I plan to set it up for 5 watts input. Should be a fun project!
Rich KC8MWG
On Saturday, July 1, 2017, 9:32:14 AM EDT, KC8WBK via Groups.Io <cruisenewsnet@...> wrote:
I had my HFPacker amp refurbished and set up for 5 watts in, 38 watts out.? It makes things easier although it is less of a challenge.? I built the amp from a kit about 10 years ago so it is one of the early versions of this amp.? It uses two IRF510s.? I hope my antenna does not melt! 
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I had my HFPacker amp refurbished and set up for 5 watts in, 38 watts out.? It makes things easier although it is less of a challenge.? I built the amp from a kit about 10 years ago so it is one of the early versions of this amp.? It uses two IRF510s.? I hope my antenna does not melt! 
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On Sat, July 1, 2017 14:21, EA3IAV wrote: Ok. Here is how I solved this.
i have completlyvredone the wiring keeping the negative sidew all togheter
and positive ones all togheter.
not mixing grounds from other places! Good! Yes, correct grounding from one central ground point is usually recommended especially in RF environments. Glad you were able to get it working! 73 Allard PE1NWL
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Re: Si5351A: facts and myths
Hans,
Now that I think about it, divides were avoided because I thought it might be going into an FPGA.
But that never happened.
Jerry
toggle quoted message
Show quoted text
On Sat, Jul 1, 2017 at 05:32 am, Jerry Gaffke wrote:
On that one I avoided all divides entirely by precomputing an inverse, as it was a rather stupid uC. ?
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Re: Si5351A: facts and myths
Hans, I'm rather proud of the shifty trick in the new si5351bx routines: ?? /g/BITX20/files/KE7ER/si5351bx_0_0.ino
msa = si5351bx_vcoa / fout; // Integer part of vco/fout
msb = si5351bx_vcoa % fout; // Fractional part of vco/fout
msc = fout; // Divide by 2 till fits in reg
while (msc & 0xfff00000) { msb>>=1; msc>>=1; }
All 32 bit ints, costs one divide and some shifts. ?Gives results about as good as the Etherkit 64 bit math. Even more proud of this fixed point algorithm for the Si570, where you really do need all 32 bits of precision:? ? ??https://www.freelists.org/post/minima/A-New-Approach,86 On that one I avoided all divides entirely by precomputing an inverse, as it was a rather stupid uC. ? Note that the 4 msbs of the 38 bit Si570 rfreq register are apparently always zero, so I lose very little sticking with 32 bits. Jerry
On Sat, Jul 1, 2017 at 03:50 am, Hans Summers wrote:
In the end I spent many hours headscratching with pen and paper, and Excel simulations, and finally the C code... and eventually managed to figure out some neat tricks to accomplish the arithmetic I needed, using only 32-bit, without losing any precision!
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Re: Raduino v1.17 with FINE TUNE capability released
Here's a thought!
In the "Fine Tuning" mode, instead of displaying the offset on the 2nd line of the display, would it be possible to display the full frequency on the top line, for example, "A 7.123.456 LSB"? Since you can't transmit while in fine tuning mode, the additional space to display "TX" would not be needed.
What do others think?
--
John - WA2FZW
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Ok. Here is how I solved this.
i have completlyvredone the wiring keeping the negative sidew all togheter and positive ones all togheter.
not mixing grounds from other places!
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Re: Bitx TFT display code
I came across your site and was looking all over to find some sample code but no joy. ?I'm very interested I will keep checking back.
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Re: Si5351A: facts and myths
Hello Jerry
Your findings re the Si5351A slow register programming are fascinating to me. They kind of imply the Si5351A DOES double-buffer the registers! Amazing. I want to do lots more experiments myself, now. I love the way the understanding of this wonderful little $1 chip keeps being pushed forward - despite chronic lack of hard facts in the documentation.?
> Your older comment about floating point taking less flash than? > 64bit integer math was interesting.? I'd guess that if you have a > lot of computations, 64bit integer loses due to all of those 64 bit? > args getting bussed around, where standard floating point is? > just 32 bit per arg.? For just a couple computations the integer? > math might win, as the floating point multiply and divide? > subroutines are relatively large. ??
My experiences with this were based on a single line of code involving one floating point multiplication and one floating point division.?It actually was only a couple of computations, as you said - but the floating point STILL won.??
This was my original Si5351A code in the Ultimate3S QRSS/WSPR/etc transmitter kit an also later used in the other kits.?As the code evolved and code space ran out, I kept having to find places to compact the code and eventually came to the tricky one, getting rid of the floating point arithmetic. The easy thing to do was to replace it with 64-bit integers and that was when to my horror, I saw that the flash code space was even BIGGER! Just to be clear again: the entire rest of my code uses unsigned 8, 16 or 32-bit variables. This single line of code was the only place I used a float (or uint64_t).?
In the end I spent many hours headscratching with pen and paper, and Excel simulations, and finally the C code... and eventually managed to figure out some neat tricks to accomplish the arithmetic I needed, using only 32-bit, without losing any precision! When I'd done that and floating point libraries were gone from my code I reclaimed 5 or 6% of the Flash space if I recall (even after adding all my integer tricks).?
73 Hans G0UPL
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Re: Bitx TFT display code
Do you have a hardware list for your project.. I did not see a listing on your site I want of make sure I have the correct type of tft or I need to order one..
Joe VE1BWV
On Fri, Jun 30, 2017 at 10:44 PM, SP Bhatnagar <vu2spf@...> wrote: Please have a look at my blog for TFT touch screen based vfo and bfo. The first version of code should be there soon. Blog is at
73 Vu2spf Bhatnagar
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Re: Bitx TFT display code
Wow!, The features look great.... cant wait to try it out. Your website on the Colour TFT display and si5351 looks very interesting.
I like the idea of using the si5351
Thanks for the info Joe VE1BWV
On Fri, Jun 30, 2017 at 10:44 PM, SP Bhatnagar <vu2spf@...> wrote: Please have a look at my blog for TFT touch screen based vfo and bfo. The first version of code should be there soon. Blog is at
73 Vu2spf Bhatnagar
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Allard PE1NWL
N8DAH