Re: Topology of Bitx40 bandpass filter
The series resonant version does have Cmid.
73
Ken VA3ABN
On Sun, Apr 2, 2017 at 5:41 PM, cove37 via Groups.Io <cove37@...> wrote: Hm, appears to be a cross between a double and a triple tuned...5 poles, but no separate Cmid value Burton Ison W5IAC
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Re: Topology of Bitx40 bandpass filter
Hm, appears to be a cross between a double and a triple tuned...5 poles, but no separate Cmid value Burton Ison W5IAC
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You will want to take the signal off of the VFO output, then you can program in the BFO to get the correct Frequency Display. The counter will put an awful lot of noise on the DC line on the BITX board. When I tried a similar counter, I had to feed the counter through a 10MH choke with 100Uf capacitors on each side to get the noise down to an acceptable level.
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DuWayne? KV4QB
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Little Volume Control Shaft / Knob solution?
More work than what is is worth, BUT.. I took an Al. 1/4" threaded stand-off, about 1/2" long.? Could be 6-32 or 4-40.
I stuck it on the end of a tapered reamer, so I could spin it. I filed it so it would just pass thru the nut on the pot.? This is the "work" and "patience" part. Smaller than necessary, you knob will not fit nice.
I drilled the inside to about 0.154".? I used Gel type crazy glue and glued it to the pot plastic shaft.? Cut the end of the plastic shaft off flush. Put a nice small know on it.
Looks like it may work? Mike, WA6ISP
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Thanks Guys, I tried your suggestions with no luck. I then rebooted the computer and it works.?
On Sun, Apr 2, 2017 at 3:04 PM, K5ESS <k5ess.nothdurft@...> wrote: Try this. Go to Windows Control Panel and then to Device Manager go down to Ports and expand the list.? With the nano disconnected note the list of ports.? Then plug the nano (powered up) into your computer USB port and notice which new port is added to the list.? This should be the port to select in the Arduino IDE.? If no new port shows up you may not have the necessary drivers loaded. Mike K5ESS
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Re: Topology of Bitx40 bandpass filter
You can read about double tuned and tripled tuned BPF in EMRFD page 6.76.
73
Ken VA3ABN
On Sun, Apr 2, 2017 at 4:45 PM, Noel <08004us@...> wrote: I'd be curious to make a similar topology HIGH pass filter, for when I put my BitX onto the higher bands..
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73 de Noel, ZL1NC
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Try this. Go to Windows Control Panel and then to Device Manager go down to Ports and expand the list.? With the nano disconnected note the list of ports.? Then plug the nano (powered up) into your computer USB port and notice which new port is added to the list.? This should be the port to select in the Arduino IDE.? If no new port shows up you may not have the necessary drivers loaded. Mike K5ESS
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Plug USB in and out.? If you don't get a new unique port, then that is the problem. Maybe un-plug all your USB devices and see if moving Raduino around works? You must see the port in the list.
Try on another computer.? Next would be to buy a NANO and try it, maybe the Raduino is bad or boot program need to be re-installed. I have some that don't work anymore.
USB pain can be a bummer. Mike, WA6ISP
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I seen that but I shy away because of the GPS correction . ..wonder if it can be disabled easily?
Thank you Mike
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Re: Topology of Bitx40 bandpass filter
I'm planning to use these for both rx and tx on the 40-20-15m bands...retloss never rises above -13db, that's good enough for this market
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Re: Topology of Bitx40 bandpass filter
I'd be curious to make a similar topology HIGH pass filter, for when I put my BitX onto the higher bands..
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73 de Noel, ZL1NC
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I'm new to this. I just got my Bitx40 in and built in a box. I'm trying to upgrade the nano but I cant get past selecting a port. I'm using Arduino IDE for windows. When I go to port it is not hi-lighted. Any ideals. ?
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Topology of Bitx40 bandpass filter
Does anyone know what it is? ?It has remarkable characteristics. ?I've extrapolated it to make equally performing filters for all the other bands (confirmed with Elsie) but would like to know what I'm making...
..thanks
Burton Ison W5IAC
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And this is why I love this hobby and this list. Thanks Mike!
regards, Richard?
On Apr 2, 2017 2:58 PM, "Michael Hagen" < motdog@...> wrote:
You might put a 1K in series with the input.? Thus it would take
a larger signal but load the test circuit less.
Try on the gate of the IRF510?? That's a pretty good stiff signal
at your transmit frequency.
Try it on the SL5351 output.
It is good to experiment, this radio has a lots to learn about!
It is a wonderful base to experiment with.? I will use mine
mostly for playing with the receiver and Arduino code.
I don't have an antenna.? So it will be a long wire out the door
and /or the Signal Generator!
I have already made PCBs (stamp sized) for the Silicons Labs
oscillator and have a Nano driving it with I2C.
The examples in the Arduino Code work!? Sweeping, Fixed Freq.
ect.? The library makes it magic.
Mike, WA6ISP
On 4/2/2017 11:27 AM, richard kappler
wrote:
Nothing in particular, trying to learn.
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Re: State of the EEPROM After a Download
From other projects I have made with custom EEPROM settings, I have found the EEPROM is unchanged untill there is a write or put performed.
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73 de Noel, ZL1NC
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You might put a 1K in series with the input.? Thus it would take
a larger signal but load the test circuit less.
Try on the gate of the IRF510?? That's a pretty good stiff signal
at your transmit frequency.
Try it on the SL5351 output.
It is good to experiment, this radio has a lots to learn about!
It is a wonderful base to experiment with.? I will use mine
mostly for playing with the receiver and Arduino code.
I don't have an antenna.? So it will be a long wire out the door
and /or the Signal Generator!
I have already made PCBs (stamp sized) for the Silicons Labs
oscillator and have a Nano driving it with I2C.
The examples in the Arduino Code work!? Sweeping, Fixed Freq.
ect.? The library makes it magic.
Mike, WA6ISP
On 4/2/2017 11:27 AM, richard kappler
wrote:
toggle quoted message
Show quoted text
Nothing in particular, trying to learn.
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The sketch by Gene Marcus W3PM can be found in the group and does what you want. ? v/r Fred W4JLE ?
toggle quoted message
Show quoted text
From: [email protected] [mailto:[email protected]] On Behalf Of Mike via Groups.Io
Sent: Sunday, April 2, 2017 7:53 AM
To: [email protected]
Subject: Re: [BITX20] Raduino BFO hook up? ? Does anyone know of Arduino code that works on a Arduino with an encoder that handles 10 MHZ and below (LSB) and above USB with the correct frequency readout? The Pa3fat code I am using works well below 10 MHZ but 20 meters I am at 9MHZ and tuning is backwards (when display shows going up in frequency.. Output is actually going down) which makes converting tuff!
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Nothing in particular, trying to learn.
On Apr 2, 2017 2:25 PM, "Michael Hagen" < motdog@...> wrote: What do you want to measure?
It has 100 Ohm input resistance on input transistor base ( Cap Coupled).? So you need to find a signal somewhere that this low impedance won't load down?
Mike, WA6ISP
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What do you want to measure?
It has 100 Ohm input resistance on input transistor base ( Cap Coupled).? So you need to find a signal somewhere that this low impedance won't load down?
Mike, WA6ISP
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Richard W2KAP
It is normal to connect your frequency counter to the VFO output, and to program
in an IF offset.? This lets the counter tell you the operating frequency when receiving
and transmitting.? Connecting the counter to the antenna port could be bad for several
reasons.? (1) it would only show frequency when transmitting. and (2) the RF power
available at the antenna port when transmitting could do bad things to your frequency
counter.
Arv? K7HKL
_._
On Sun, Apr 2, 2017 at 12:11 PM, richard kappler <richkappler@...> wrote: I am working on strengthening my kit building skills before I tackle my next Bitx40, so I have built the ?frequency counter and should have the parts for a coupla antenna analyzers tomorrow.
Regarding the freq counter, it has 4 "inputs", a pair of grounds, 8-15 VDC and sig in. I have two questions: 1. Any reason I shouldn't hook the VDC in to the incoming power for the BitX??
2. Regarding Sig In, I should connect this to the brown (center) of the antenna output?
regards, Richard
-- W2KAP In any given circuit, the most expensive part will always sacrifice itself to protect the fuse.
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DuWayne Schmidlkofer
Chris Viningre