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Marc, The schematic link is right under the intro picture.? I missed them also.? I had to look again.
Marco - KG5PRT?
On Mar 3, 2017 11:41 AM, "Marc Jones via Groups.Io" <gw0wvl= [email protected]> wrote: Bill, I've not seen the schematic, Can't find it ... Do you have a link for it ... Thanks.
Regards
Marc 'Gw0wvl'... On Fri, 3 Mar 2017 at 14:20, bill I just downloaded and did a quick review of the ubitx schematic. What an interesting design! Next week I will start putting together my recently arrived bitx40 and I am looking forward to working on it. But to be honest, what I really want now to do is build a ubitx from scratch. As an old engineer (though new ham) I haven't been this charged up about a new project in a long time. Thank you and 73 bill
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Hi Marc,
if if you open the documentation link ?there is a picture right at the beginning showing the Transceiver. Directly below there are 3 links. 2 pointing to circuit diagrams and one to the Raduino Software. Nevertheless here the link to the circuit diagram:??
Armin, DJ2AG
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Thanks Chaps ... Got it now .
Much appreciated .
Regards
On Fri, 3 Mar 2017 at 17:48, DJ2AG <ya_duck@...> wrote: Hi Marc,
if if you open the documentation link ?there is a picture right at the beginning showing the Transceiver. Directly below there are 3 links. 2 pointing to circuit diagrams and one to the Raduino Software. Nevertheless here the link to the circuit diagram:??
Armin, DJ2AG
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I'm looking at it on my phone.. Screen is only some 5 inches, I didn't even see the links under the picture until I enlarged it all ... Ha?
Regards?
Marc 'Gw0wvl'...
On Fri, 3 Mar 2017 at 18:08, Mark Jones <gw0wvl@...> wrote: Thanks Chaps ... Got it now .
Much appreciated .
Regards
Marc 'Gw0wvl'... On Fri, 3 Mar 2017 at 17:48, DJ2AG <ya_duck@...> wrote: Hi Marc,
if if you open the documentation link ?there is a picture right at the beginning showing the Transceiver. Directly below there are 3 links. 2 pointing to circuit diagrams and one to the Raduino Software. Nevertheless here the link to the circuit diagram:??
Armin, DJ2AG
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Schematic is the link labeled "" This is pretty cool Farhan, a much simplified, and yet more capable design.?
--
Ryan Flowers KC7RYS?
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Maybe a "Select Opposite Sideband" could be added to the menu system. That way if someone wants to use a digital mode like PSK-31 (which requires USB) on 40m or 80m, they could. Then there is always 60m.
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of course, it is an easy feature
- f
On Sat, Mar 4, 2017 at 1:04 AM, Al Duncan VE3RRD <ve3rrd@...> wrote: Maybe a "Select Opposite Sideband" could be added to the menu system. That way if someone wants to use a digital mode like PSK-31 (which requires USB) on 40m or 80m, they could. Then there is always 60m.
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Looks good to me. I see the Bitx40 as a big stepping stone towards a homebrew trx. If like me, you have limited test facilities and no dedicated workshop it is a great help to start off with something that works even if it has issues. An assembled board of the uBITX would have a big take up. There is still a character ser error in the Improvements section Harmonic Filters. "Their design is left as ?�?exercise to the reader" Great stuff. Keep going. 73 Brian.
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Ashar advises to keep leads carrying CLK#1 and #2 to the DBMs short. If I run them in RG316 will that remove the need for very short runs? I assume the trifilar toroids are standard Bitx ones, 8 ?trifilar turns on FT37-43. The filter inductors can be worked out using toroids.info and a digital LC meter.? Also, am thinking of using 2n3904s inatead of the BC849 without changing any resistors. Any concerns? Thanks for bringing HF-1 to this point! 73 Paul VK3HN?
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The transistors are 2n3904. Yes, you can use coax. - f
On 4 Mar 2017 9:37 p.m., "Paul Taylor VK3HN" < prt459@...> wrote: Ashar advises to keep leads carrying CLK#1 and #2 to the DBMs short. If I run them in RG316 will that remove the need for very short runs? I assume the trifilar toroids are standard Bitx ones, 8 ?trifilar turns on FT37-43. The filter inductors can be worked out using and a digital LC meter.? Also, am thinking of using 2n3904s inatead of the BC849 without changing any resistors. Any concerns? Thanks for bringing HF-1 to this point! 73 Paul VK3HN?
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BC548 instead 2N3904? I have really a LOT of BC548, many hundreds
of them!
Rick LU9DA
El 4/3/2017 a las 16:16, Ashhar Farhan
escribió:
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Show quoted text
The transistors are 2n3904. Yes, you can use coax.
- f
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The BC548 has an FT of 150 MHz. The 2N3904 has an FT of 300 MHz. for change, it matters at 45 Mhz.
- f
On Sun, Mar 5, 2017 at 12:28 AM, Ricardo Suarez <elu9da@...> wrote:
BC548 instead 2N3904? I have really a LOT of BC548, many hundreds
of them!
Rick LU9DA
El 4/3/2017 a las 16:16, Ashhar Farhan
escribió:
The transistors are 2n3904. Yes, you can use coax.
- f
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Ashar, looking at BC849 on Element14. They are in Australia so delivery is only a few days. There are about 6 variants of BC849s which look substantially similar other than hFe which varies from 200 to over 500. ?As hFE is gain I expect this is significant. What hFE range should I choose? http://au.element14.com/webapp/wcs/stores/servlet/Search?catalogId=15001&langId=43&storeId=10184&gs=true&st=Bc849
Regards and thanks Paul VK3HN?
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Those are 2n3904's. ?The schematic shows bc849's because that was the symbol that was handy. ?Somebody needs to email Ashhar a kicad 2n3904 symbol, as he badly needs one.
On Sat, Mar 4, 2017 at 02:00 pm, VK3HN wrote: Ashar, looking at BC849 on Element14. ?
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Might pay to check
out Rockby too, Paul. I think I got some BC849 from them a
year or so ago, at a very good price.
Bill, VK7MX
On 5/03/2017 9:00 AM, Paul Taylor VK3HN
wrote:
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Show quoted text
Ashar, looking at BC849 on Element14. They are in Australia so
delivery is only a few days. There are about 6 variants of
BC849s which look substantially similar other than hFe which
varies from 200 to over 500. ?As hFE is gain I expect this is
significant. What hFE range should I choose?
Regards and thanks Paul VK3HN?
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Note that T5 and T6 are bifilar 4:1 transformers, not
the trifilar as in the symbol. Another case of BC849'ism.
The 4:1 makes perfect sense since the impedance of the Cohn filter is
about 200 ohms, and it is feeding a TIA at 50 ohms on one side
and a 50 ohm mixer on the other.
john
AD5YE
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Wow! Congratulations and thanks for the endorsement. I would be grateful if you would leave a nice review on Amazon.
73/DX
k4ia, Buck
K3# 101
Honor Roll
8B DXCC
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On 3/4/2017 6:51 PM, John Backo via Groups.Io wrote: Note that T5 and T6 are bifilar 4:1 transformers, not
the trifilar as in the symbol. Another case of BC849'ism.
The 4:1 makes perfect sense since the impedance of the Cohn filter is
about 200 ohms, and it is feeding a TIA at 50 ohms on one side
and a 50 ohm mixer on the other.
john
AD5YE
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Ashhar could just change the name to 3904 and CAD , I suppose, permits such name change.
On Sun, Mar 5, 2017 at 3:43 AM, Jerry Gaffke via Groups.Io <jgaffke@...> wrote: Those are 2n3904's.? The schematic shows bc849's because that was the symbol that was handy.? Somebody needs to email Ashhar a kicad 2n3904 symbol, as he badly needs one.
On Sat, Mar 4, 2017 at 02:00 pm, VK3HN wrote:
Ashar, looking at BC849 on Element14. ?
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I will change the designation to 2N3904. I use the trifilar transformers even where I need a bifilar as it it reduced the inventory. We just leave the extra wiring unused. I have a box full of trifiilar wound, FT37-43 that I can solder in anywhere.
- f
On Sun, Mar 5, 2017 at 9:31 AM, Mvs Sarma <mvssarma@...> wrote: Ashhar could just change the name to 3904 and CAD , I suppose, permits such name change.
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Show quoted text
On Sun, Mar 5, 2017 at 10:03 AM, Ashhar Farhan <farhanbox@...> wrote: I will change the designation to 2N3904. I use the trifilar transformers even where I need a bifilar as it it reduced the inventory. We just leave the extra wiring unused. I have a box full of trifiilar wound, FT37-43 that I can solder in anywhere.
- f
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Marc Jones
VK3HN