Re: OT: Solderable Preformed Breadboard Jumper Wires
Is it possible you are trying to solder to aluminum or steel pins crimped on the ends of the wires?? ?Those may be more difficult?to impossible to solder. Gordon
On Sun, Jun 6, 2021 at 7:35 AM Dennis Zabawa < kg4rul@...> wrote: I am using the ones that come as kits of wires, cut to various lengths and with the ends preformed for insertion into solderless breadboards like these:
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Re: OT: Solderable Preformed Breadboard Jumper Wires
I am using the ones that come as kits of wires, cut to various lengths and with the ends preformed for insertion into solderless breadboards like these:
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Finally got a microphone hooked up to the uSDX this morning and spent the day making contacts!? Slick little radio, for the price, but I like the uBITX better for base station duty. But, once I get it in a box it will be a great little radio to hump back into the weeds and operate POTA!? :-)
73,
Justin B.
KI5GKD
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Re: OT: Solderable Preformed Breadboard Jumper Wires
What wires are you using? Are you re-purposing male-male jumpers w/ pins on the ends or just raw wire cut to fit? Ken, N2VIP
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On Jun 5, 2021, at 13:22, Dennis Zabawa <kg4rul@...> wrote:
?I have been breadboarding using solderless breadboards and preformed jumper wires.? I can buy protoboards that have the same hole pattern for more permanent applications.? However, when I move the jumper wires, from the solderless breadboard to a protoboard, I find that the wires are extremely hard to solder.? Does anyone know of a brand of these wires that is readily solderable?
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Re: OT: Solderable Preformed Breadboard Jumper Wires
Cheap wire probably heavily oxidized
On Sat, Jun 5, 2021 at 7:52 PM Dennis Zabawa < kg4rul@...> wrote: I have several different brands of the jumper wires.? In all cases, when I try to solder these jumpers on the protoboard, it is nearly impossible to get the solder to wick onto the wire surface even with added flux.
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Re: OT: Solderable Preformed Breadboard Jumper Wires
I have several different brands of the jumper wires.? In all cases, when I try to solder these jumpers on the protoboard, it is nearly impossible to get the solder to wick onto the wire surface even with added flux.
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Re: OT: Solderable Preformed Breadboard Jumper Wires
Can you go into a bit more detail on the troubles you're seeing when soldering the current breadboard wires on the protoboard?
On Sat, Jun 5, 2021 at 10:22 AM Dennis Zabawa < kg4rul@...> wrote: I have been breadboarding using solderless breadboards and preformed jumper wires.? I can buy protoboards that have the same hole pattern for more permanent applications.? However, when I move the jumper wires, from the solderless breadboard to a protoboard, I find that the wires are extremely hard to solder.? Does anyone know of a brand of these wires that is readily solderable?
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OT: Solderable Preformed Breadboard Jumper Wires
I have been breadboarding using solderless breadboards and preformed jumper wires.? I can buy protoboards that have the same hole pattern for more permanent applications.? However, when I move the jumper wires, from the solderless breadboard to a protoboard, I find that the wires are extremely hard to solder.? Does anyone know of a brand of these wires that is readily solderable?
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On Thu, Jun 3, 2021 at 08:00 PM, David Alexander wrote:
where was the list tom
I'll see if I can google around and find the article again. Tom, wb6b
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Not the ceramic ones, you get xtal ones.. a little pricy but sharp
stopbands.
Basic ones are 7.5 KHz, I am sure wider ones are there. Probably in
21.4MHz.
At 05/06/2021, you wrote:
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Raj,?
I evaluated a few 10.7 mhz fm filters. Their stop-band rejection was
hardly 50 dB, not enough for HF radio.
Btw, the sbitx scheme does not stop using a narrow cw crystal filter. The
entire IF strip is broadband. So, you switch in the?? cw filter
(lets say at 9 Mhz) and change the LO and BFO by reprogramming the
Si5351.
- f
On Sat 5 Jun, 2021, 9:32 AM Raj vu2zap,
<
rajendrakumargg@...> wrote:
- Farhan,
- Use a 10.7 filter!
- Raj
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Raj,? I evaluated a few 10.7 mhz fm filters. Their stop-band rejection was hardly 50 dB, not enough for HF radio. Btw, the sbitx scheme does not stop using a narrow cw crystal filter. The entire IF strip is broadband. So, you switch in the? cw filter (lets say at 9 Mhz) and change the LO and BFO by reprogramming the Si5351. - f
Farhan,
Use a 10.7 filter!
Raj
At 04/06/2021, you wrote:
? David??
At 11 MHz, it is difficult to build a 10 khz filter without desoldering
all the caps and the matching transformers.?
However, if you are okay with the 3 Khz bandwidth, then it can be used
unmodified
On Fri 4 Jun, 2021, 9:50 PM David Forrest,
<drf5na@...>
wrote:
- Couldn't sBITX do a 10kHz wide window with a relatively unmodified
uBITX without the 27MHz or 40MHz IF mods?
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Farhan,
Use a 10.7 filter!
Raj
At 04/06/2021, you wrote:
toggle quoted message
Show quoted text
? David??
At 11 MHz, it is difficult to build a 10 khz filter without desoldering
all the caps and the matching transformers.?
However, if you are okay with the 3 Khz bandwidth, then it can be used
unmodified
On Fri 4 Jun, 2021, 9:50 PM David Forrest,
<drf5na@...>
wrote:
- Couldn't sBITX do a 10kHz wide window with a relatively unmodified
uBITX without the 27MHz or 40MHz IF mods?
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I added a new section called "sBITX" to the groups.io WIKI with the info David suggested.
--
? 73
??? Bob? KD8CGH
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i forgot the attachments. hopefully they appear now.
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hello friends. i hope it is ok to post this here. i made a linear amplifier, similar to wa2eby. basically two amps running in anti phase. maybe it may be helpful to someone who wants to boost the signal a bit more,
for your ham operations. i think it should work well. sugestions are welcome.
best regards,?
joao g.
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Re: Cheap Chinese Linear LPF
On Fri, Jun 4, 2021 at 06:22 AM, Jerry Gaffke wrote:
If you need a better temperature gauge for your oven, could crush the oven light.
Already wired in with high temp tolerant wire insulation.
Keep a flashlight handy, hung from a nail in the wall near the oven.
That's a great idea :) If you don't need as fast of response in your oven, maybe you could leave the envelope on. The oven light might be able to do double duty as a light when you open the door, and temperature measurement and control when the door is closed.? An amazing invention... Advancing cooking technology born right here on this group. If you are married, though, you don't want to be pulling apart the stove for too long re-engineering and improving it. May cause unintended strife in your domestic life.? Tom, wb6b
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Shirley, given that we are looking for a wide bandwidth, we wouldn't need much of matching. I just took the first eight off the smd strip and they worked!
On Fri 4 Jun, 2021, 10:32 PM Shirley Dulcey KE1L, < mark@...> wrote: I was eyeing those 40 MHz fundamental mode crystals that you can buy from Digi-Key and Mouser. The prices are reasonable, under 30 cents. Looks like you've now done some of the work to try them out. I do wonder how many it will be necessary to buy to get a properly matched set.
I've been thinking of trying my first sBITX build as a modular one, doing each section of the circuit on a separate board. (Each of the two KISS mixers on a board, the crystal filter on another, and so forth.) Miniaturizing everything onto a single board is less important for something with a 7" touchscreen because it's never going to be small anyway. But I'm also looking forward to seeing the finished board design.
On Fri, Jun 4, 2021 at 10:42 AM Ashhar Farhan < farhanbox@...> wrote: I am reassigning pins to simplify the pcb layout. So, please hold on for a week (until I get my pcbs) before starting to make the sbitx. I also managed a 30 khz wide filter on 40 mhz (whoa!) Which means, we will be able to cover the entire HF band.
On Fri 4 Jun, 2021, 7:53 PM David Forrest, < drf5na@...> wrote: The??video,?
the??link to the googledoc presentation materials and
the??repository, with the code chunks like
rx_process() :??
are all enlightening.
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Re: Receiver working, sensitivity issues?
I think we are addressing multiple topics now. The paradigm of the small loop versus a longer length of wire as a receive only antenna. For the latter wire diameter less critical.??
Simian don't be discouraged as you learn and explore. I hope you are receiving with your ubitx soon. A longer wire for receiving is easier to get working first, while you continue to consider a loop. I have qso with a few folk who used a small loop, but they always have substantial conductor and a sharp tuning network.?
Curt
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I was eyeing those 40 MHz fundamental mode crystals that you can buy from Digi-Key and Mouser. The prices are reasonable, under 30 cents. Looks like you've now done some of the work to try them out. I do wonder how many it will be necessary to buy to get a properly matched set.
I've been thinking of trying my first sBITX build as a modular one, doing each section of the circuit on a separate board. (Each of the two KISS mixers on a board, the crystal filter on another, and so forth.) Miniaturizing everything onto a single board is less important for something with a 7" touchscreen because it's never going to be small anyway. But I'm also looking forward to seeing the finished board design.
On Fri, Jun 4, 2021 at 10:42 AM Ashhar Farhan < farhanbox@...> wrote: I am reassigning pins to simplify the pcb layout. So, please hold on for a week (until I get my pcbs) before starting to make the sbitx. I also managed a 30 khz wide filter on 40 mhz (whoa!) Which means, we will be able to cover the entire HF band.
On Fri 4 Jun, 2021, 7:53 PM David Forrest, < drf5na@...> wrote: The??video,?
the??link to the googledoc presentation materials and
the??repository, with the code chunks like
rx_process() :??
are all enlightening.
|
?David? At 11 MHz, it is difficult to build a 10 khz filter without desoldering all the caps and the matching transformers.? However, if you are okay with the 3 Khz bandwidth, then it can be used unmodified
On Fri 4 Jun, 2021, 9:50 PM David Forrest, < drf5na@...> wrote: Couldn't sBITX do a 10kHz wide window with a relatively unmodified uBITX without the 27MHz or 40MHz IF mods?
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Raj vu2zap
Bob Benedict, KD8CGH
Shirley Dulcey KE1L