You might get by with a high stearic acid content paraffin wax, but it might just melt and rum all over if left in the car on a summer day. ;>)
toggle quoted message
Show quoted text
Thanks Thomas.
What about dipping the toroid in candle wax?
73 Ken
|
Bees wax is a better choice! Like in old radios.
I always keep a bit around.
73 Raj
toggle quoted message
Show quoted text
At 28/12/2016, you wrote:
Thanks Thomas.
What about dipping the toroid in candle wax?
73 Ken
|
you don't realy nees a coating, i have used a spot of superglue to hold it down to the board. it seems to have no perceptible difference.
- f
On 28-Dec-2016 7:41 am, "Ken Chase chase8043@... [BITX20]" < BITX20@...> wrote:
?
I am building up my own external BPF's for 80/40/20. I need to coat the windings to hold them in place. Can I use a spray clear coat? Will it affect the inductance?
73
Ken VA3ABN
|
Re: New Group Member and pre-Raduino arduino purchaser
Thank you for the fast response! Sent from Y! Mail on my Samsung Galaxy S7
On Tue, Dec 27, 2016 at 10:31 PM, jgaffke@... [BITX20] wrote:
?
Welcome to the group!
Ashhar answered this on Dec 24, message 19700. Wiring for a Bitx40 without the Raduino can be found at ? ??
Jerry, KE7ER
---In BITX20@..., wrote :
I was wondering if there were instructions to make it work as is without the Raduino?
|
Re: New Group Member and pre-Raduino arduino purchaser
Welcome to the group!
Ashhar answered this on Dec 24, message 19700. Wiring for a Bitx40 without the Raduino can be found at ? ??
Jerry, KE7ER
---In BITX20@..., <don.cota@...> wrote :
I was wondering if there were instructions to make it work as is without the Raduino?
|
Measuring capacitance and other stuff
Here's a very cool example of something you could do with the Raduino. ? ??
Imagine you are off on an island somewhere, a Bitx was dropped from the sky?but doesn't quite work.
Would be nice to have a DC voltmeter, perhaps using a Raduino ADC. We might want a diode+cap RF probe in the corner of the board somewhere. Then we could do things like sweep that IF filter using the Si5351. What other handy tools does the Raduino make possible?
What's the best way to measure inductance with a minimum of additional parts?
A bit beyond what I'd try with the Raduino, but I really like K5BCQ's AQRP Vector Impedance Analyzer. ?Two Si5351 channels kept exactly 2khz apart are routed to two SA612 mixers?such that the two 2khz outputs can be sensed by two ADC's. ?One 2khz signal measures voltage, the other measures current, and the phase shift between the two is significant. ?Processed by some DSP algorithms on a uC. ?Using the Si5351's square waves, can reject harmonics since those would be?separated by more than 2khz. ?Does a very nice job of measuring an inductor, graphically showing at what frequency the capacitance between windings starts to take over.
Jerry, KE7ER
|
New Group Member and pre-Raduino arduino purchaser
Hello from a new Member and relatively new Ham. I'm also kinda new to Yahoo Groups as well. I got into this hobby after I retired from Active Duty. I've built a couple Pixie Kits. I'm really looking forward to finishing this SSB kit.
Hi Group members. My name is Don-KG5IWL. I just recently received my BitX40 in the mail. I got the kit before the Raduino board was added. I was wondering if there were instructions to make it work as is without the Raduino?
I'm not very arduino savvy yet. But I do plan on ?buying another kit or two down the road after I finish moving. Any help and good links would be appreciative. I'm also looking forward to adding an amp and a few more gadgets to it in the future. Sent from Y! Mail on my Samsung Galaxy S7
|
I received some parts in the mail tonight.? A package of (25) T37-6 toroid cores and 32AWG wire.? I wound up 45 turns on the coil, soldered it in, and it now seems to pass inspection according to the troubleshooting video, at least.? I hear noise now at C2 at at the antenna feed.? I will say that the core for L2 is actually a T30-6, not a T37-6. ?
I'm not hearing anything but digital and CW on 40M tonight, but I'm not hearing any SSB on my main rig on the same antenna either.? I guess 40M is dead tonight?? Seems strange...? Guess I'll test again tomorrow.
Kent W9WB
On Sat, Dec 24, 2016 at 1:09 PM, Paul Chebi paul.chebi@... [BITX20] <BITX20@...> wrote:
?
Farhan I was referring to DSS vs vfo, freq counter , enclosure, and of course the packaging and broken parts at arrival. It would be nice to have a whole package instead of mixing and matching and worrying about interactive compatibility.? Again just my thoughts for improvements and certainly no criticism of your greatly comendable initiatives. Paul Chebi
|
Re: A more stable Bitx40 (fun with ceramic resonators)
You'd have to pull it pretty far to get it into the US 40m phone band 12.000 - 4.915 = 7.085 MHz.
---In BITX20@..., <cruisenewsnet@...> wrote : Would this one work??
|
Awww...MEK ain't so bad. Smellzzz nizzzeee tooo... glurfle meep grp ding... huh? wazzat? 
Rich KC8MWG
On Tuesday, December 27, 2016 9:25 PM, "Ken Chase chase8043@... [BITX20]" wrote:
?
Thanks Thomas.
What about dipping the toroid in candle wax?
73 Ken
|
Thanks Thomas.
What about dipping the toroid in candle wax?
73 Ken
On Tue, Dec 27, 2016 at 9:22 PM, Thomas Noel tnoel@... [BITX20] <BITX20@...> wrote:
?
MEK will rot your liver in short order without good ventilation.
I like a fine drizzle of hot-melt glue, followed by judicious use of a hot air resolder nozzle to melt and spread the glue. Look for the glue gun nozzles used to add binding tape to the edge of carpet:
Why not use coil dope? The commercial stuff isn't cheap, but it's just polystyrene dissolved in MEK, so not hard to make.
Rich KC8MWG
?I am building up my own external BPF's for 80/40/20. I need to coat the windings to hold them in place. Can I use a spray clear coat? Will it affect the inductance?
73
Ken VA3ABN
|
MEK will rot your liver in short order without good ventilation.
I like a fine drizzle of hot-melt glue, followed by judicious use of a hot air resolder nozzle to melt and spread the glue. Look for the glue gun nozzles used to add binding tape to the edge of carpet:
toggle quoted message
Show quoted text
Why not use coil dope? The commercial stuff isn't cheap, but it's just polystyrene dissolved in MEK, so not hard to make.
Rich KC8MWG
?I am building up my own external BPF's for 80/40/20. I need to coat the windings to hold them in place. Can I use a spray clear coat? Will it affect the inductance?
73
Ken VA3ABN
|
Re: A more stable Bitx40 (fun with ceramic resonators)
Would this one work? | | | | | | Order Murata Electronics North America CSTLS4M91G53-A0 (490-6005-3-ND) at DigiKey. Check stock and pricing, view product specifications, and order online. | | | | Preview by Yahoo | | | ?
|
Re: A more stable Bitx40 (fun with ceramic resonators)
Looks like Mouser has a 4.8mhz Ceramic Resonator, which would put it at 7200khz.?
? ?and also a 4.75mhz xtal to put it at 7225khz:
Not a lot of wiggle room with a crystal but you could get between 7222 and 7225 with a trim cap.The frequency would at least be "rock solid" if you'll pardon the pun.
|
Clear coat is what I have handy. Wanted something quick and easy to use.
73
Ken VA3ABN
On Tue, Dec 27, 2016 at 9:13 PM, Richard Knack ihc73scout2@... [BITX20] <BITX20@...> wrote:
?
Why not use coil dope? The commercial stuff isn't cheap, but it's just polystyrene dissolved in MEK, so not hard to make.
Rich KC8MWG
?
I am building up my own external BPF's for 80/40/20. I need to coat the windings to hold them in place. Can I use a spray clear coat? Will it affect the inductance?
73
Ken VA3ABN
|
Why not use coil dope? The commercial stuff isn't cheap, but it's just polystyrene dissolved in MEK, so not hard to make.
Rich KC8MWG
On Tuesday, December 27, 2016 9:05 PM, "Ken Chase chase8043@... [BITX20]" wrote:
?
I am building up my own external BPF's for 80/40/20. I need to coat the windings to hold them in place. Can I use a spray clear coat? Will it affect the inductance?
73
Ken VA3ABN
|
I am building up my own external BPF's for 80/40/20. I need to coat the windings to hold them in place. Can I use a spray clear coat? Will it affect the inductance?
73
Ken VA3ABN
|
|
|
|
|
Re: A more stable Bitx40 (fun with ceramic resonators)
What is a good source in the US for a ceramic resonator?
|
Raj vu2zap
Joel Caulkins/N6ALT
Todd K7TFC