Re: First real try at 80 meters using QRPKITS 80M low pass filter
That heatsink only 1cm thick but works OK I like to look after the pa I waiting on a kit from EA3GCY called ILER-17+ dds? Going to put it on 15,12,10m its my new winter project chris
On 28 Nov 2017 14:40, "chris gress" < Chrisg0wfh@...> wrote: Yep feel free I have built 3 sets all the same looking I had the dds programmed for me so no credit for them. Chris
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Re: Just want a USB switch
Maybe not enough coffee but at first I though you meant something like this...
And did I read that correctly?? Your daughter is nine years old?
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Re: Just want a USB switch
No but,
If you want any of the features that Allards sketch provides then go for it.
You could add some components to the BFO and have USB.
Raj
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At 28-11-2017, you wrote: Do I really have to use Allard's sketch for this one single mod? I just want a switch to go from LSB to USB.
Thank you
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
Yep feel free I have built 3 sets all the same looking I had the dds programmed for me so no credit for them. Chris
On 28 Nov 2017 14:36, "chris gress" < chrisg0wfh@...> wrote: Cool it worked I upgraded my heatsinks on my pa,s I have added photo the pa never gets hot?
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
?with THAT huge heat sink.....it is no wonder it never gets hot!!!
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Cool it worked I upgraded my heatsinks on my pa,s I have added photo the pa never gets hot?
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
Cool it worked I upgraded my heatsinks on my pa,s I have added photo the pa never gets hot?
On 28 Nov 2017 14:23, "chris gress" < Chrisg0wfh@...> wrote: OK let's see if this works? Photo showing 8watts powered at 12v Photo showing 13watts powered at 13,5v In to 50ohm dummy load?
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
?VERY COOL!!!!? ?Thanks for the schematic!!!? (and the rig looks nice too)
Now can I have permission to publish that on our ARES web site at qsl.net/nf4rc???
THANKS!!
Gordon?
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OK let's see if this works?
Photo showing 8watts powered at 12v
Photo showing 13watts powered at 13,5v
In to 50ohm dummy load?
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This may be a stupid question. I'm just getting into the bitx40. Actually, I've only been a ham about 3 months. My daughter is 9 and wants the bitx40 fir talking and FT8. She's a tech, but taking her general this weekend.
I removed C91 and C92. I took apart an old power supply and swiped the heatsink for the final. From what I understand, all that needs to be changed is a + to a - to go from 19 to 12 and be on USB.
Do I really have to use Allard's sketch for this one single mod? I just want a switch to go from LSB to USB.
Thank you
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
OK let's see if this works? Photo showing 8watts powered at 12v Photo showing 13watts powered at 13,5v In to 50ohm dummy load?
On 28 Nov 2017 14:00, "chris gress" < Chrisg0wfh@...> wrote: OK I don't have PC I see if I can do it with my phone chris
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
OK I don't have PC I see if I can do it with my phone chris
On 28 Nov 2017 13:48, "Gordon Gibby" < ggibby@...> wrote:
Would you be able to scribble down a portion of the schematic, putting the original capacitors etc in black, and your changes? for 60 meters?in RED or some other color, and then take a photo with a cell phone camera and post it here for posterity?? ?That
might help out other people......
Gordon?
I need to correct one thing it should be 100pf on L7 not 470pf sorry chris
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
Would you be able to scribble down a portion of the schematic, putting the original capacitors etc in black, and your changes? for 60 meters?in RED or some other color, and then take a photo with a cell phone camera and post it here for posterity?? ?That
might help out other people......
Gordon?
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I need to correct one thing it should be 100pf on L7 not 470pf sorry chris
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
I need to correct one thing it should be 100pf on L7 not 470pf sorry chris
On 28 Nov 2017 13:33, "Gordon Gibby" < ggibby@...> wrote:
?thank you for that infomration!!!!
Nice for 60m add the 470 to L7. And add 150pf to each cap C2,C4,C6 to the bpf I get 8watt with 12,2v and 10watt with 12,8v chris
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
?thank you for that infomration!!!!
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Nice for 60m add the 470 to L7. And add 150pf to each cap C2,C4,C6 to the bpf I get 8watt with 12,2v and 10watt with 12,8v chris
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
Nice for 60m add the 470 to L7. And add 150pf to each cap C2,C4,C6 to the bpf I get 8watt with 12,2v and 10watt with 12,8v chris
On 28 Nov 2017 13:26, "Gordon Gibby" < ggibby@...> wrote:
?very cool.? ?I'm using the cheap solution of a 470 pf strapped from one end of the BPF to the other so I don't know exactly where it is optimized....perhaps I can get some rough measuresments of that by looking at received signal....
I found my bitx on 80m gave 5watt on 3,799 and on 3,500 gave 6watt I got a lpf /bpf? coming from QRP labs the ones I was using where copy's and not working well but my bitx on 60m I get the same power as my 40m one and it works well?
Chris?
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Hello all, As said in datasheet of SiLabs, decoupling and ground plane is very important (see §6) On raduino the GND via is too far from chip !! ..and it causes a common impedance to ALL outputs ! May be with arranged layout and better GND we can improve spurs... I did several tests and trails to improve bridies and spurious of the Raduino module : /g/BITX20/message/33741- with one activated output : it is clean ! - loading all 3 outputs at 50 ohms instead of one makes more bridies ! - grounding the Xtal casing : no improvement - having seperate 50 ohms coax is better, but there is still coupling on tracks from the chip to Raduino's terminals (puting the finger on it increase more spurs) - reducing the driver output current and power improve much more better : at level 1 (4 mA) I have +8.5 dBm, with a 2 dB attenuator pad it is just sufficient for +7dBm mixer with 0.1 dB added loss compared to +10 dBm drive at level 2 or 3 - I will try at level 0 (2mA) +4.5dB without attenuator to mixer... - using industrial mixers with -50 to -60dB LO rejection are better than self made mixers : TFM-2, SBL-1, SRA-1 ... the coupling LO to RF or LO to IF is reduced I aggree with Henning notes and will try to change 2nd osc to 33 MHz (but 33-11.997... = 21.003.. MHz !),or find a 33 Mhz xtal... For Dimitar, I tried activating PLL B on Farhan's software : no change on spurs ! I found on library that PLL B is not affected on CLK0,1,2? anyway ! Now I'm using Allard's subroutines to configure the Si5351 instead of the library, I spare about 10 ko of ROM in the Nano !!! but no change on bridies? ! I'm rebuilding the Ubitx software from Fahran with corrections, improvements and? Allard's tricks : real dual VFO, A=B, RIT, new Smeter, adding voltmeter, tuning more stable,... Now I'm facing to CW mode and review the compete function... I'm not an expert in C++ , I started to learn since september with this project (I have a stong backgrouned in assembler) ?To EB7ME, is your receiver clean ? Did you try with antenna connected to a dummy load ? 73 de F5RCT Jean-Matthieu
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
?very cool.? ?I'm using the cheap solution of a 470 pf strapped from one end of the BPF to the other so I don't know exactly where it is optimized....perhaps I can get some rough measuresments of that by looking at received signal....
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I found my bitx on 80m gave 5watt on 3,799 and on 3,500 gave 6watt I got a lpf /bpf? coming from QRP labs the ones I was using where copy's and not working well but my bitx on 60m I get the same power as my 40m one and it works well?
Chris?
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
I found my bitx on 80m gave 5watt on 3,799 and on 3,500 gave 6watt I got a lpf /bpf? coming from QRP labs the ones I was using where copy's and not working well but my bitx on 60m I get the same power as my 40m one and it works well? Chris?
On 28 Nov 2017 12:36, "Gordon Gibby" < ggibby@...> wrote:
?I'm sorta simple and goal directed --- In the prototype version for the ARES group I'll add another toggle switch to switch an 80 meter LPF in and out somehow.? ?I? *thought* I had seen higher output on an earlier much simpler trial --- but was rushed and
just got the basics going, will fiddle more with it later.
Used it later in the evening to make WINLINK connections to 3 different RMS servers in different states.? ?
In the middle of the night, the Critical Frequency lifts a bit in the southern US and it went above the 80 meter band & I was able to get a strong signal from a WINLINK RMS just 65 miles from me --- way too far for ground wave, but even with just 5 W output
was able to transact email with that RMS (tho it took a lot of repeats)
It is so neat to be able to shift this rig to different bands!!!!!? ?Been doing ham radio for about 45 years, this is the first time I've really gotten into the guts of drastically modifying any rig.? ?This is just like a solid state version of a Heathkit
SB-102 transceiver.? ??
Gordon?
Very nice! A simple way to go to 80m, certainly simpler than my multi-band conversion.?
--
Ryan Flowers W7RLF
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
?I'm sorta simple and goal directed --- In the prototype version for the ARES group I'll add another toggle switch to switch an 80 meter LPF in and out somehow.? ?I? *thought* I had seen higher output on an earlier much simpler trial --- but was rushed and
just got the basics going, will fiddle more with it later.
Used it later in the evening to make WINLINK connections to 3 different RMS servers in different states.? ?
In the middle of the night, the Critical Frequency lifts a bit in the southern US and it went above the 80 meter band & I was able to get a strong signal from a WINLINK RMS just 65 miles from me --- way too far for ground wave, but even with just 5 W output
was able to transact email with that RMS (tho it took a lot of repeats)
It is so neat to be able to shift this rig to different bands!!!!!? ?Been doing ham radio for about 45 years, this is the first time I've really gotten into the guts of drastically modifying any rig.? ?This is just like a solid state version of a Heathkit
SB-102 transceiver.? ??
Gordon?
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Very nice! A simple way to go to 80m, certainly simpler than my multi-band conversion.?
--
Ryan Flowers W7RLF
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think about the fact, that three squarewaves are generated within
a tiny chip, for clocking digital circuits crosstalk normally is
not a bit issue, but for analog circuits this must be an issue!
This means that to use three SI5351 for individualt frequecies
seems to me the best solution. The chips are cheap!!
For best freqeuncy stability only one xtal osc ( TXCO or even
OCXO 25 MHz or 27 MHz) should be used, but its three outputs must
be "perfectly decoupled" meaning mimimize the crosstalk between
the outputs of the buffer stages.
Another thought:
The second osc for the conversion 45 MHz - 12 MHz should not be
blaced within the range of the first LO i.e. 45 + 12 = 57 MHz) but
45 - 12 MHz = 33 MHz. This is quite close to the maximum input
frequency of the uBITX (30 MHz).? Lowering the second IF to say 5
MHz would ease the situation.
At least: the phase nosie performance of the SI5351 is not at its
best and degrades the higher the output frequency is.
Henning Weddig
DK5LV
Am 28.11.2017 um 05:09 schrieb VK3HN:
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Hi Roberto and
Andrew
I have a part built ubitx as well.? I ran Raduino software on
Arduino nano, using all 3 clocks, and found the large number and
strength of birdies on all bands made the rx unusable.? I assumed
the si5351 was just too dirty when using 3 clocks.? However I
moved onto another project and did not spend time debugging my
build.? Did you use si5351 and if so, is it clean enough?
73 Paul VK3HN.?
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Re: First real try at 80 meters using QRPKITS 80M low pass filter
Very nice! A simple way to go to 80m, certainly simpler than my multi-band conversion.?
--
Ryan Flowers W7RLF
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Arvo W0VRA
Raj vu2zap
Jean-Matthieu F5RCT