Re: Some BCI Filter Notes
Thank you Chuck, good info. One other question, wire size. For example, the QRPme BCI calls for 20 turns of #24 ga magnet wire in the T37-2 core. What if some uses what they have, could be 26-30 ga or even 22 ga magnet wire? Do I add an extra turn or take away one, for example?
I bought a new set of wire strippers for very small wire & got to see just how sharp the tool was yesterday. I did not get to wind the toroids yesterday because I found the factory roof-mounted port of our RV had UV damaged MC-4 like connectors. My eBay order came to repair them so I installed adapters someone designed so I could convert with patch cables to true MC-4 connectors, back in operation now.
Anyway, I do not have a vice so found a good way to mount the toroid holders until I can find some #24 ga magnet wire. I have plenty of spools never opened from Radio Shack 6 years ago of #22, 26, 28, # 30, but the only #24 may come from borrowing from a QRPme kit. I think Rex sent me was #30 ga I just measured by my new extra sharp wire stripper. I give it more respect today after yesterday's episode of strip the flesh from Davey's fingers. Lol.
Looking forward to your answers about how wire size may affect the windings.
Cheers,
Davey - KU9L
PS - I live moment to moment on my Victron Apps of my solar & shunt controllers since we dry camp often out west.
The QRPme toroid winder is about 2.5' above the floor, not a bad compromise.
This is me winding toroids with the eye magnifier, & me when I discovered I kinked the wire!!! Lol
On Fri, Apr 14, 2023 at 6:56 AM, Chuck Carpenter <w5usj@...> wrote: Davey,
You mentioned size of toroids. And that the number of turns was about the same
for a couple sizes. For the iron powder cores that will happen but the watts the
core can handle without overheating will be different.? Rule of thumb seems to
be 5W for T37 and 10W for T50.
Also, sometimes when you try to get a specific inductance rather than something
close by just winding turns, a yellow core might do better than red. The tolerance
on the cores is fairly wide. One value that is used to determine turns is AL. The
various winding calculators use a nominal value. MRCC provides that and so does
Diz. Those are the only two I've used with MRCC being my 1st choice.
Rather than use nominal values, use a good L/C meter and measure.? Adjust turns, pinch
together, more inductance; spread apart, less inductance. Red cores will have less turns
for a specific inductance than yellow.
Diz uses ten turns to determine specific values of AL if needed.? The AL equation resolves
to simply;? AL = 10 x uH.
|
Re: Some BCI Filter Notes
Davey,
You mentioned size of toroids. And that the number of turns was about the same
for a couple sizes. For the iron powder cores that will happen but the watts the
core can handle without overheating will be different.? Rule of thumb seems to
be 5W for T37 and 10W for T50.
Also, sometimes when you try to get a specific inductance rather than something
close by just winding turns, a yellow core might do better than red. The tolerance
on the cores is fairly wide. One value that is used to determine turns is AL. The
various winding calculators use a nominal value. MRCC provides that and so does
Diz. Those are the only two I've used with MRCC being my 1st choice.
Rather than use nominal values, use a good L/C meter and measure.? Adjust turns, pinch
together, more inductance; spread apart, less inductance. Red cores will have less turns
for a specific inductance than yellow.
Diz uses ten turns to determine specific values of AL if needed.? The AL equation resolves
to simply;? AL = 10 x uH.
|
Re: Some BCI Filter Notes
Davey,
Looks like you have the toroids figured out.? T37-6 would be yellow.
A utility I like for inductors is Mini Ring Core Calculator. Find it on the web.
I assembled the N4ELS filter, aka the QRPme HPF filter kit;
a basic filter using common part values. Toroids are T37-2.
The nanoVNA was used to get sweeps of toroids at 1.8uh and 1.5uH.
Results were pretty much the same with 1.5 having better input impedance.
This is a broad cast band filter. It won't do anything to help SWI short wave interference.
A second higher frequency LPF would help with that problem. As is, between 500kHz and 1.6MHz,
the attenuation ranges from about-70dB to -40dB
Note that the combination looks a lot like a BPF...8^) That was attempted but...
If the SWI is from a single station, a series-tuned notch filter would help. MRCC has a feature
that helps determine L/C values using F of station.
To cover lower bands, the components get more complicated and use values that are
not standard.
?
|
Re: Some BCI Filter Notes
Dan reminded me that the T50 can handle more power than the T37, which isn't a problem for QRPme rigs, but can be a problem for his 20W Chinese radios, especially doing 100% duty cycle for FT-8 mode.
Davey - KU9L
On Thursday, April 13, 2023 at 10:23:06 AM EDT, David Knapp via groups.io <renewables@...> wrote:
Reference:?
Okay, the -2 are red toroids.?
I see that the T37-2 are 0.375" in O.D. and the T50-2 are 0.5"in O.D. Their specs aren't far off from each other, I guess the main reason for choosing either is how many turns you need and what is your available space? Dan sent the T50-2 red toroids in his kit which are the half-inch size and the T37-2 are what I am going to use on the QRPme version. The filter profile is obviously different in the roll-off and/or cut-off frequency from both designs. Maybe Chuck can assist us in comparing the two just for our own understanding since the layout of the parts is identical. Chuck should have his in a day or two I am guessing. Dan has been very helpful in helping my understand it so far. I will have one for my tuna cans and one for my Penntek TR-35 to play with.
Cool. Now I can go to winding.?
Thanks, Davey - KU9L
On Wednesday, April 12, 2023 at 09:44:03 AM EDT, David Knapp via groups.io <renewables@...> wrote:
Ok, from the schematic it says 1.6uH x2, which is 20 turns of #24 wire on the T37-2 toroid. I just have to figure out which of the yellow, red, or black toroids is the T37-2 of the large & small ones from the Prep T kit. More homework ...
On Wed, Apr 12, 2023 at 8:23 AM, David Knapp via groups.io <renewables@...> wrote:
Chuck,
Now that I have the QRPme BCI Filter kit in hand AND the Preparation T kit in hand, based on your observations, would it be ideal to wind two toroids for this kit? I intend to use it primarily on 40 - 20M, I do not see myself deploying much on 80M for portable operations. Would there be any noticeable visual/audible dB enhancement or build AS-IS? Later today I will have both kits in-hand according to the latest USPS estimates. I haven't compared yet to see if the caps are of similar values between the two kits. I know Dan built many prototypes until his Chinese gear was effectively rejecting the AM broadcast stuff. I will make a chart between the two kits to understand any differences other than just the connectors. While the grandbabies are taking a nap today perhaps I can wind a couple toroids unless of course if I won't be joining myself if I stare at the charts too long, LOL.
I am not smart enough yet to put my Rig Expert to good use for this task ...
Fun stuff,
Davey - KU9L
On Tuesday, April 11, 2023 at 05:57:46 PM EDT, Chuck Carpenter <w5usj@...> wrote:
The filter being considered was from N4ELS, Nelson, using readily available parts and no toroids to wind. Chokes aren't really all that good so best to use toroids. The Elsie design plot looks like this:  The important marker data are Transmission Loss, Return Loss/VSWR and Real R values. The filter looks good for 40 meters up.? The filter was done before nanoVNA so no sweeps, yet. I may have one around someplace to do a VNA check with. K9BPs HPF is really nice and, just looking at the pictures, worth the money.? I ordered one. I believe I figured out the Elsie design and the plot looks like this:  Note the blue impedance line. That is really good; hugs 50 Ohms from one end to the other. The marker data show just how good the can be. I won't disclose the design values used for the plot.? Buy the filter and determine them for your own amazement. I'll know how close I came in a few days.? Fun Stuff...
|
Re: Some BCI Filter Notes
Reference:?
Okay, the -2 are red toroids.?
I see that the T37-2 are 0.375" in O.D. and the T50-2 are 0.5"in O.D. Their specs aren't far off from each other, I guess the main reason for choosing either is how many turns you need and what is your available space? Dan sent the T50-2 red toroids in his kit which are the half-inch size and the T37-2 are what I am going to use on the QRPme version. The filter profile is obviously different in the roll-off and/or cut-off frequency from both designs. Maybe Chuck can assist us in comparing the two just for our own understanding since the layout of the parts is identical. Chuck should have his in a day or two I am guessing. Dan has been very helpful in helping my understand it so far. I will have one for my tuna cans and one for my Penntek TR-35 to play with.
Cool. Now I can go to winding.?
Thanks, Davey - KU9L
On Wednesday, April 12, 2023 at 09:44:03 AM EDT, David Knapp via groups.io <renewables@...> wrote:
Ok, from the schematic it says 1.6uH x2, which is 20 turns of #24 wire on the T37-2 toroid. I just have to figure out which of the yellow, red, or black toroids is the T37-2 of the large & small ones from the Prep T kit. More homework ...
On Wed, Apr 12, 2023 at 8:23 AM, David Knapp via groups.io <renewables@...> wrote:
Chuck,
Now that I have the QRPme BCI Filter kit in hand AND the Preparation T kit in hand, based on your observations, would it be ideal to wind two toroids for this kit? I intend to use it primarily on 40 - 20M, I do not see myself deploying much on 80M for portable operations. Would there be any noticeable visual/audible dB enhancement or build AS-IS? Later today I will have both kits in-hand according to the latest USPS estimates. I haven't compared yet to see if the caps are of similar values between the two kits. I know Dan built many prototypes until his Chinese gear was effectively rejecting the AM broadcast stuff. I will make a chart between the two kits to understand any differences other than just the connectors. While the grandbabies are taking a nap today perhaps I can wind a couple toroids unless of course if I won't be joining myself if I stare at the charts too long, LOL.
I am not smart enough yet to put my Rig Expert to good use for this task ...
Fun stuff,
Davey - KU9L
On Tuesday, April 11, 2023 at 05:57:46 PM EDT, Chuck Carpenter <w5usj@...> wrote:
The filter being considered was from N4ELS, Nelson, using readily available parts and no toroids to wind. Chokes aren't really all that good so best to use toroids. The Elsie design plot looks like this:  The important marker data are Transmission Loss, Return Loss/VSWR and Real R values. The filter looks good for 40 meters up.? The filter was done before nanoVNA so no sweeps, yet. I may have one around someplace to do a VNA check with. K9BPs HPF is really nice and, just looking at the pictures, worth the money.? I ordered one. I believe I figured out the Elsie design and the plot looks like this:  Note the blue impedance line. That is really good; hugs 50 Ohms from one end to the other. The marker data show just how good the can be. I won't disclose the design values used for the plot.? Buy the filter and determine them for your own amazement. I'll know how close I came in a few days.? Fun Stuff...
|
Re: BCI Filter for Sea Sprite+
Yeah, the delays I had never coincided to anything other than supply chain issues. This includes QRPGuys, 4StatesQRP, QRPKits & so on. I even had similar delays with Heath Kits back in the day. This is not like shopping on AMZ or Ham Radio Outlet. Yeah, my enthusiasm sometimes ran out by the time I got my K1SWL SB-40 Kit from Dave, but us small guys are very limited to the capital we ican invest. I closed my AMZ store because of similar issue. I wanted to change over to Amateur Radio Kits myself, but I only had to imagine or to reread all of Rex's posts over the years to get a quick dose of reality. I think the main problem I would have to solve is not the delays, but tbe communications of why I have delays. I was dealing with a similar non- communication issue with my current summer employer, but now that I am finally onboarded and ready to start work May 1st I can shut my mouth, lol.
Here is my now activity in the photo:
On Wed, Apr 12, 2023 at 9:30 AM, John Putnum, AC9UV <johnfputnam@...> wrote:
Richard,
I have ordered a lot from Rex with no issues. True around a buildathon time there can be a delay but for the price and the quality and support it's worth a little wait. But that's my experience.
? ?---John AC9UV
On 04/12/2023 8:46 AM Richard Girou via groups.io <rlynngirou@...> wrote:
One thing I learned is, don't order anything that has nothing to do with the build a thon. You have to wait and wait. I probably will die first.?
|
Re: BCI Filter for Sea Sprite+
Richard,
I have ordered a lot from Rex with no issues. True around a buildathon time there can be a delay but for the price and the quality and support it's worth a little wait. But that's my experience.
? ?---John AC9UV
On 04/12/2023 8:46 AM Richard Girou via groups.io <rlynngirou@...> wrote:
One thing I learned is, don't order anything that has nothing to do with the build a thon. You have to wait and wait. I probably will die first.?
|
Re: BCI Filter for Sea Sprite+
One thing I learned is, don't order anything that has nothing to do with the build a thon. You have to wait and wait. I probably will die first.?
|
Re: Some BCI Filter Notes
Ok, from the schematic it says 1.6uH x2, which is 20 turns of #24 wire on the T37-2 toroid. I just have to figure out which of the yellow, red, or black toroids is the T37-2 of the large & small ones from the Prep T kit. More homework ...
On Wed, Apr 12, 2023 at 8:23 AM, David Knapp via groups.io <renewables@...> wrote:
Chuck,
Now that I have the QRPme BCI Filter kit in hand AND the Preparation T kit in hand, based on your observations, would it be ideal to wind two toroids for this kit? I intend to use it primarily on 40 - 20M, I do not see myself deploying much on 80M for portable operations. Would there be any noticeable visual/audible dB enhancement or build AS-IS? Later today I will have both kits in-hand according to the latest USPS estimates. I haven't compared yet to see if the caps are of similar values between the two kits. I know Dan built many prototypes until his Chinese gear was effectively rejecting the AM broadcast stuff. I will make a chart between the two kits to understand any differences other than just the connectors. While the grandbabies are taking a nap today perhaps I can wind a couple toroids unless of course if I won't be joining myself if I stare at the charts too long, LOL.
I am not smart enough yet to put my Rig Expert to good use for this task ...
Fun stuff,
Davey - KU9L
On Tuesday, April 11, 2023 at 05:57:46 PM EDT, Chuck Carpenter <w5usj@...> wrote:
The filter being considered was from N4ELS, Nelson, using readily available parts and no toroids to wind. Chokes aren't really all that good so best to use toroids. The Elsie design plot looks like this:  The important marker data are Transmission Loss, Return Loss/VSWR and Real R values. The filter looks good for 40 meters up.? The filter was done before nanoVNA so no sweeps, yet. I may have one around someplace to do a VNA check with. K9BPs HPF is really nice and, just looking at the pictures, worth the money.? I ordered one. I believe I figured out the Elsie design and the plot looks like this:  Note the blue impedance line. That is really good; hugs 50 Ohms from one end to the other. The marker data show just how good the can be. I won't disclose the design values used for the plot.? Buy the filter and determine them for your own amazement. I'll know how close I came in a few days.? Fun Stuff...
|
Re: Some BCI Filter Notes
Chuck,
Now that I have the QRPme BCI Filter kit in hand AND the Preparation T kit in hand, based on your observations, would it be ideal to wind two toroids for this kit? I intend to use it primarily on 40 - 20M, I do not see myself deploying much on 80M for portable operations. Would there be any noticeable visual/audible dB enhancement or build AS-IS? Later today I will have both kits in-hand according to the latest USPS estimates. I haven't compared yet to see if the caps are of similar values between the two kits. I know Dan built many prototypes until his Chinese gear was effectively rejecting the AM broadcast stuff. I will make a chart between the two kits to understand any differences other than just the connectors. While the grandbabies are taking a nap today perhaps I can wind a couple toroids unless of course if I won't be joining myself if I stare at the charts too long, LOL.
I am not smart enough yet to put my Rig Expert to good use for this task ...
Fun stuff,
Davey - KU9L
On Tuesday, April 11, 2023 at 05:57:46 PM EDT, Chuck Carpenter <w5usj@...> wrote:
The filter being considered was from N4ELS, Nelson, using readily available parts and no toroids to wind. Chokes aren't really all that good so best to use toroids. The Elsie design plot looks like this:  The important marker data are Transmission Loss, Return Loss/VSWR and Real R values. The filter looks good for 40 meters up.? The filter was done before nanoVNA so no sweeps, yet. I may have one around someplace to do a VNA check with. K9BPs HPF is really nice and, just looking at the pictures, worth the money.? I ordered one. I believe I figured out the Elsie design and the plot looks like this:  Note the blue impedance line. That is really good; hugs 50 Ohms from one end to the other. The marker data show just how good the can be. I won't disclose the design values used for the plot.? Buy the filter and determine them for your own amazement. I'll know how close I came in a few days.? Fun Stuff...
|
Re: Photo of my Sea Sprite+ in my ham shack
Daniel,
No, they were larger than could be sent. Then some people came over, then a Tai Chi Class. I will cut down the size and include them here.
? ?---John AC9UV
toggle quoted message
Show quoted text
On 04/11/2023 9:04 PM Daniel KK4MRN via groups.io <sqldan2000@...> wrote:
John,
Did you forget to upload the photos?
73 Daniel KK4MRN
On Tuesday, April 11, 2023 at 05:35:34 PM EDT, John Putnum, AC9UV <johnfputnam@...> wrote:
Daniel,
I set up a set setup with dummy load, TinySA and power meter and put my various QRP kits through the same setup. Here are some of those.
---John AC9UV
? ? 73
Hello all,
Where are we with our Sea Sprite+ ?
Make any contacts yet?? Anyone still trying?
Any issues?? ?Please post.? Someone may help you.
I am looking for more notes, photos, and videos from others of their Sea Sprite+.? Either in the shack or where they operate it.
Anybody have photos or videos of their Sea Sprite+ hooked up to their power meter, oscilloscope, spectrum analyzer, multimeter or some other test tool?? And explain what you're doing/measuring and explain what it is showing?
Did anyone do any additional mods other than what Rex showed?
Other hams would like to see.? I will try to create some photos myself.? I still need to do the audio mods and BCI filter.
Let's keep the momentum going...? ??
Curt,
It was part of the Buildathon on the weekend of March 25, 2023.
Build the radio, get on the air and make contacts...? Do mods to the radio...? ?Share info.? Or ask for help.? Sadly, the conversations were via private email.? Not sure why.? I think public via this group would have been better.??
73 Daniel KK4MRN
On Mon, Apr 3, 2023 at 05:46 AM, Curt wrote:
Didn't know was supposed to, didn't realize that there was a "Sprite Sprint" happening.? Mine is on 20M anyway so can't run it on 40M anymore.? I have a "Lil Squall" that has band modules for 80, 40, 30, 20, 15 though.? About the same radio in a smaller can.? Ordered a 10M module but have yet to receive it.
|
Re: Photo of my Sea Sprite+ in my ham shack
John, Did you forget to upload the photos?
73 Daniel KK4MRN
On Tuesday, April 11, 2023 at 05:35:34 PM EDT, John Putnum, AC9UV <johnfputnam@...> wrote:
Daniel,
I set up a set setup with dummy load, TinySA and power meter and put my various QRP kits through the same setup. Here are some of those.
---John AC9UV
? ? 73
Hello all,
Where are we with our Sea Sprite+ ?
Make any contacts yet?? Anyone still trying?
Any issues?? ?Please post.? Someone may help you.
I am looking for more notes, photos, and videos from others of their Sea Sprite+.? Either in the shack or where they operate it.
Anybody have photos or videos of their Sea Sprite+ hooked up to their power meter, oscilloscope, spectrum analyzer, multimeter or some other test tool?? And explain what you're doing/measuring and explain what it is showing?
Did anyone do any additional mods other than what Rex showed?
Other hams would like to see.? I will try to create some photos myself.? I still need to do the audio mods and BCI filter.
Let's keep the momentum going...? ??
Curt,
It was part of the Buildathon on the weekend of March 25, 2023.
Build the radio, get on the air and make contacts...? Do mods to the radio...? ?Share info.? Or ask for help.? Sadly, the conversations were via private email.? Not sure why.? I think public via this group would have been better.??
73 Daniel KK4MRN
On Mon, Apr 3, 2023 at 05:46 AM, Curt wrote:
Didn't know was supposed to, didn't realize that there was a "Sprite Sprint" happening.? Mine is on 20M anyway so can't run it on 40M anymore.? I have a "Lil Squall" that has band modules for 80, 40, 30, 20, 15 though.? About the same radio in a smaller can.? Ordered a 10M module but have yet to receive it.
|
Re: Some BCI Filter Notes
We have 1440 WROK just down the road from our camping location so may find out soon. My K9DP kit doesn't come until Thursday, but can compare them later on. This summer I won't need either as there are 100 14K peaks all around us and very few stations AM or FM cover the whole crooked valley.
I am just excited to get my box from Rex today as he never gets to rest between vollies of projects. Now I want on that 10M Rock Mites update project. We head to Colorado on 4/24, no rest between projects. I will probably attempt my Two Tinned Super Tuna ][+ POTA activation from the San Isabel NF near Buena Vista, CO ~9,000' ASL on a Monday or Tuesday.t
On Tue, Apr 11, 2023 at 4:57 PM, Chuck Carpenter <w5usj@...> wrote: The filter being considered was from N4ELS, Nelson, using readily available parts and no toroids to wind. Chokes aren't really all that good so best to use toroids. The Elsie design plot looks like this:  The important marker data are Transmission Loss, Return Loss/VSWR and Real R values. The filter looks good for 40 meters up.? The filter was done before nanoVNA so no sweeps, yet. I may have one around someplace to do a VNA check with. K9BPs HPF is really nice and, just looking at the pictures, worth the money.? I ordered one. I believe I figured out the Elsie design and the plot looks like this:  Note the blue impedance line. That is really good; hugs 50 Ohms from one end to the other. The marker data show just how good the can be. I won't disclose the design values used for the plot.? Buy the filter and determine them for your own amazement. I'll know how close I came in a few days.? Fun Stuff...
|
Re: BCI Filter for Sea Sprite+
My daughter-in-law text me that my QRPme order came at 10AM this morning so we made it a picnic day this afternoon at the campground with the grandchildren! Yeah!
So now I have 2 BCI filters to build!!! Yeah!
Tonight I am soldering the kid's led CW senders.
Cheers,
On Tue, Apr 11, 2023 at 1:10 PM, David Knapp via groups.io <renewables@...> wrote: My BCI filter didn't come today, it left St Charles for Chicago so it can come back to W Dundee on Thursday, got to live USPS.
Dan said he had a small AMZ store also, I didn't know that when I read the QRPer,com article the first time.
I wasn't trying to circumvent the QRPme kits, just showing an alternative for those wanting it & my QROme BCI filter didn't come yet. The difference between the two is one has RCA connectors & one has BNC connectors. Both have their uses.
Cheers es 72, Davey - KU9L On Tue, Apr 11, 2023 at 8:15 AM, David Knapp via groups.io <renewables@...> wrote:
Daniel,
I ordered one of these a couple of weeks back but did not receive it before we left Florida, I think it is along the line that was being discussed during the Buildathon. We had a 36-hour power outage in FL during the Buildathon due to record-warm temperatures there so I missed a lot of the live-action and by the time the replays were available, I was packing up the new RV to head to Illinois in the middle of all of the tornadoes. Fortunately we only saw a little hail in TN.
When I got to Illinois, the BCI filter and the other kits weren't there either (I sent an alternate roving mailing address) so I went to my backup source and ordered a BCI filter from Dan. I told Dan about QRPme and he was going to check them out. I get my K9DP BCI filter on Thursday. I may or may not get it assembled before we leave Illinois as I caught the Epstein-Bar virus in my jaw/left side of my head and am having lots of trouble with pain/balance/nausea. But this looks like a good kit to have on hand too. Obviously, it only works if the antenna is bypassed with the instruction Rex gave for doing so.
http://www.K9DP.com
Cheers, es 72,
Davey - KU9L
On Tuesday, April 11, 2023 at 06:38:01 AM EDT, Daniel KK4MRN via groups.io <sqldan2000@...> wrote:
Hello,
Somehow I missed where a BCI Filter (Broadcast Interference?) was mentioned that can be built for the Sea Sprite+.? I think Rex pointed out a circuit that can be built?
I could hear a AM Broadcast station on my Sea Sprite+.
Does anyone know where that BCI filter circuit was?
Would a band pass filter for 40m work like qrp-labs band pass filter kit?
73 Daniel KK4MRN
|
Slow Speed Saunter at 7.114 1st Day of the Month
"The Slow Speed Saunter is open to all licensed amateurs. Operators new to CW are encouraged to get on the air and make your first contacts during The Slow Speed Saunter. We will work at your speed and are very forgiving of mistakes; we will even make a few of our own."
No need to use a straight key unless you are a member but we have one now! And note the 7.114 frequency.
More time to practice and get our chicken cans on the air; are we the new CCOTA?
|
The filter being considered was from N4ELS, Nelson, using readily available parts and no toroids to wind. Chokes aren't really all that good so best to use toroids. The Elsie design plot looks like this:  The important marker data are Transmission Loss, Return Loss/VSWR and Real R values. The filter looks good for 40 meters up.? The filter was done before nanoVNA so no sweeps, yet. I may have one around someplace to do a VNA check with. K9BPs HPF is really nice and, just looking at the pictures, worth the money.? I ordered one. I believe I figured out the Elsie design and the plot looks like this:  Note the blue impedance line. That is really good; hugs 50 Ohms from one end to the other. The marker data show just how good the can be. I won't disclose the design values used for the plot.? Buy the filter and determine them for your own amazement. I'll know how close I came in a few days.? Fun Stuff...
|
Re: Photo of my Sea Sprite+ in my ham shack
Daniel,
I set up a set setup with dummy load, TinySA and power meter and put my various QRP kits through the same setup. Here are some of those.
---John AC9UV
? ? 73
Hello all,
Where are we with our Sea Sprite+ ?
Make any contacts yet?? Anyone still trying?
Any issues?? ?Please post.? Someone may help you.
I am looking for more notes, photos, and videos from others of their Sea Sprite+.? Either in the shack or where they operate it.
Anybody have photos or videos of their Sea Sprite+ hooked up to their power meter, oscilloscope, spectrum analyzer, multimeter or some other test tool?? And explain what you're doing/measuring and explain what it is showing?
Did anyone do any additional mods other than what Rex showed?
Other hams would like to see.? I will try to create some photos myself.? I still need to do the audio mods and BCI filter.
Let's keep the momentum going...? ??
Curt,
It was part of the Buildathon on the weekend of March 25, 2023.
Build the radio, get on the air and make contacts...? Do mods to the radio...? ?Share info.? Or ask for help.? Sadly, the conversations were via private email.? Not sure why.? I think public via this group would have been better.??
73 Daniel KK4MRN
On Mon, Apr 3, 2023 at 05:46 AM, Curt wrote:
Didn't know was supposed to, didn't realize that there was a "Sprite Sprint" happening.? Mine is on 20M anyway so can't run it on 40M anymore.? I have a "Lil Squall" that has band modules for 80, 40, 30, 20, 15 though.? About the same radio in a smaller can.? Ordered a 10M module but have yet to receive it.
|
Re: BCI Filter for Sea Sprite+
My BCI filter didn't come today, it left St Charles for Chicago so it can come back to W Dundee on Thursday, got to live USPS.
Dan said he had a small AMZ store also, I didn't know that when I read the QRPer,com article the first time.
I wasn't trying to circumvent the QRPme kits, just showing an alternative for those wanting it & my QROme BCI filter didn't come yet. The difference between the two is one has RCA connectors & one has BNC connectors. Both have their uses.
Cheers es 72, Davey - KU9L
On Tue, Apr 11, 2023 at 8:15 AM, David Knapp via groups.io <renewables@...> wrote:
Daniel,
I ordered one of these a couple of weeks back but did not receive it before we left Florida, I think it is along the line that was being discussed during the Buildathon. We had a 36-hour power outage in FL during the Buildathon due to record-warm temperatures there so I missed a lot of the live-action and by the time the replays were available, I was packing up the new RV to head to Illinois in the middle of all of the tornadoes. Fortunately we only saw a little hail in TN.
When I got to Illinois, the BCI filter and the other kits weren't there either (I sent an alternate roving mailing address) so I went to my backup source and ordered a BCI filter from Dan. I told Dan about QRPme and he was going to check them out. I get my K9DP BCI filter on Thursday. I may or may not get it assembled before we leave Illinois as I caught the Epstein-Bar virus in my jaw/left side of my head and am having lots of trouble with pain/balance/nausea. But this looks like a good kit to have on hand too. Obviously, it only works if the antenna is bypassed with the instruction Rex gave for doing so.
http://www.K9DP.com
Cheers, es 72,
Davey - KU9L
On Tuesday, April 11, 2023 at 06:38:01 AM EDT, Daniel KK4MRN via groups.io <sqldan2000@...> wrote:
Hello,
Somehow I missed where a BCI Filter (Broadcast Interference?) was mentioned that can be built for the Sea Sprite+.? I think Rex pointed out a circuit that can be built?
I could hear a AM Broadcast station on my Sea Sprite+.
Does anyone know where that BCI filter circuit was?
Would a band pass filter for 40m work like qrp-labs band pass filter kit?
73 Daniel KK4MRN
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Re: BCI Filter for Sea Sprite+
Daniel,
I ordered one of these a couple of weeks back but did not receive it before we left Florida, I think it is along the line that was being discussed during the Buildathon. We had a 36-hour power outage in FL during the Buildathon due to record-warm temperatures there so I missed a lot of the live-action and by the time the replays were available, I was packing up the new RV to head to Illinois in the middle of all of the tornadoes. Fortunately we only saw a little hail in TN.
When I got to Illinois, the BCI filter and the other kits weren't there either (I sent an alternate roving mailing address) so I went to my backup source and ordered a BCI filter from Dan. I told Dan about QRPme and he was going to check them out. I get my K9DP BCI filter on Thursday. I may or may not get it assembled before we leave Illinois as I caught the Epstein-Bar virus in my jaw/left side of my head and am having lots of trouble with pain/balance/nausea. But this looks like a good kit to have on hand too. Obviously, it only works if the antenna is bypassed with the instruction Rex gave for doing so.
http://www.K9DP.com
Cheers, es 72,
Davey - KU9L
On Tuesday, April 11, 2023 at 06:38:01 AM EDT, Daniel KK4MRN via groups.io <sqldan2000@...> wrote:
Hello,
Somehow I missed where a BCI Filter (Broadcast Interference?) was mentioned that can be built for the Sea Sprite+.? I think Rex pointed out a circuit that can be built?
I could hear a AM Broadcast station on my Sea Sprite+.
Does anyone know where that BCI filter circuit was?
Would a band pass filter for 40m work like qrp-labs band pass filter kit?
73 Daniel KK4MRN
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Re: Photo of my Sea Sprite+ in my ham shack
Hello all,
Where are we with our Sea Sprite+ ?
Make any contacts yet?? Anyone still trying?
Any issues?? ?Please post.? Someone may help you.
I am looking for more notes, photos, and videos from others of their Sea Sprite+.? Either in the shack or where they operate it.
Anybody have photos or videos of their Sea Sprite+ hooked up to their power meter, oscilloscope, spectrum analyzer, multimeter or some other test tool?? And explain what you're doing/measuring and explain what it is showing?
Did anyone do any additional mods other than what Rex showed?
Other hams would like to see.? I will try to create some photos myself.? I still need to do the audio mods and BCI filter.
Let's keep the momentum going...? ??
Curt,
It was part of the Buildathon on the weekend of March 25, 2023.
Build the radio, get on the air and make contacts...? Do mods to the radio...? ?Share info.? Or ask for help.? Sadly, the conversations were via private email.? Not sure why.? I think public via this group would have been better.??
73 Daniel KK4MRN
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On Mon, Apr 3, 2023 at 05:46 AM, Curt wrote:
Didn't know was supposed to, didn't realize that there was a "Sprite Sprint" happening.? Mine is on 20M anyway so can't run it on 40M anymore.? I have a "Lil Squall" that has band modules for 80, 40, 30, 20, 15 though.? About the same radio in a smaller can.? Ordered a 10M module but have yet to receive it.
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David Knapp
