I have my (first) BITX40 and the case (actually two for some unknown reason) arrived the other day. I have yet to hay-wire it together so I can play with it (hopefully today) but I'm trying to do some planning for the case. With all of the various mods available, how many push-buttons should I plan on for on the front of the case?
--
73 Keith VE7GDH
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I got my boards here:
Rich
On Saturday, July 1, 2017, 11:31:12 AM EDT, Jorge Luiz Fenerich <py2pvt@...> wrote:
? ? ??Thanks Mike, good weekend.73? ? ? Jorge
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LOL! It may be a few months before it is completely finished, though HOPEFULLY before the end of the year. Some of the originally specified parts are obsolete (or require an order minimum of 200 parts!) and I am looking for subsititutes. Also trying to spread the cost out over time. I have a big order for the majority of the parts on the way from Mouser, and a couple of boost converters (one of which will provide the parts needed for the extra fitering) on their way from an EBay seller. Still have to order an enclosure and a heat-sink, though.
Rich KC8MWG
On Saturday, July 1, 2017, 11:44:28 AM EDT, Andrew Krause <andrew.krause@...> wrote:
When you're done, send me a pic. I'm going to caption it with "YOU MANIACS! YOU BLEW IT UP!"
Seems apropos...
(Planet of the Apes reference...)
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When you're done, send me a pic. I'm going to caption it with "YOU MANIACS! YOU BLEW IT UP!"
Seems apropos...
(Planet of the Apes reference...)
On Sat, Jul 1, 2017 at 11:34 AM, Richard Andrew Knack via Groups.Io <ihc73scout2@...> wrote: I plan to incorporate a 150 watt boost converter into the amplifier to provide 28V (with additional filtering, if needed), so that I can get the full 40 watts output. I mainly want to use the amp for SSB anyway, since CW (which I never use anyway) and digital generally work reasonably well on QRP anyway. And yes, I plan to use the extra resistor so that it reduces 5watts input to 1 watt, as I want to use it wit not just my Bitx40 (which I have not completed yet), but also my Xiegu X1M Platinum which seems to operate at a fixed 5 watts output. No such problem using it with my mcHF, as I can set the power for anywhere from a half watt up to a max of 8-10 watts (depending on the band), but it will be nice to set it for 5 watts and run it into the amp for sideband use. One of our club members gave me the original QST magazines with the build article (part 1 and 2), so I am set there.
Rich KC8MWG
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
--
Andrew KrauseGeneral Class Amateur Radio License: KM4ZJO
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I plan to incorporate a 150 watt boost converter into the amplifier to provide 28V (with additional filtering, if needed), so that I can get the full 40 watts output. I mainly want to use the amp for SSB anyway, since CW (which I never use anyway) and digital generally work reasonably well on QRP anyway. And yes, I plan to use the extra resistor so that it reduces 5watts input to 1 watt, as I want to use it wit not just my Bitx40 (which I have not completed yet), but also my Xiegu X1M Platinum which seems to operate at a fixed 5 watts output. No such problem using it with my mcHF, as I can set the power for anywhere from a half watt up to a max of 8-10 watts (depending on the band), but it will be nice to set it for 5 watts and run it into the amp for sideband use. One of our club members gave me the original QST magazines with the build article (part 1 and 2), so I am set there.
Rich KC8MWG
On Saturday, July 1, 2017, 11:17:03 AM EDT, <phil.erickson@...> wrote:
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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? ? ??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
|
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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Allard PE1NWL
N8DAH