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Hello John Putnum, AC9UV and others, Are your Morse Code skills ready for the Buildathon on March 25th? I am still trying. Numbers are the hard thing for me. I am learning at 12 WPM like Long Island CW Club is doing. I got less than 2 weeks! So, if you hear an idiot on 40m this weekend sending bad code, it could be me... LOL Just reply and say hello. Long Island CW Club has started a Sked page and a Code Buddy program. I think they have a chat thing now too and some Discord thing too. A good way for cw ops to meet up and make contacts to help improve their code skills. And of course, SKCC Group has their Sked page. SKCC Group membership is free. Nothing like being able to operate and make contacts on your own radio you built with your own hands... 73 Daniel KK4MRN

Yeah, I have the world's worst video editing software, but at least I have fun. Virtually every cool piece of software has not discovered the Chromebook platform yet. However, even the HAMRS ham radio logging software promises Google is working on making Chromebook software writer compatible, someday. Nonetheless, I's does the best as I cans, LOL. Online video creation software was bypassed by most SW designers, LOL. Excuse the AI voice, a golf club accident from a neighbor boy with a mean backswing sent me speaking in a stuttering tone for the past 57 years, therefore I am a CW man, LOL. https://youtu.be/cV8xrOinMuw Davey - KU9L

Hello Group, Several years ago I bought a QRPme Rockmite ][ kit to build but never got around to it. Recently I pulled the kit out thinking to start the build but found that I do not have the assembly instructions. Being a complete novice kit builder, I was hoping that the assembly instructions were on the groups.io site, but could not find them. I did find the original Rockmite Assembly instructions on the SmallWonders site. Will the original assembly instructions/checklist still apply for the Rockmite ][ or are there updated assembly instructions for the QRPme version? Thanks in advance for any help. Dan KD4VBV

group, Just asked a question of chatGBT. What is a good design for a low power low pass filter for the 20 meter ham band and got: A low pass filter is a circuit that allows low frequency signals to pass through while attenuating high frequency signals. For the 20 meter ham band, which spans from 14.000 MHz to 14.350 MHz, a low pass filter can be designed to attenuate frequencies above 14.350 MHz. Here is a simple design for a low power low pass filter for the 20 meter ham band: Determine the cutoff frequency: The cutoff frequency is the frequency at which the filter starts to attenuate signals. For a low pass filter, the cutoff frequency is the highest frequency that the filter allows to pass through. In this case, the cutoff frequency should be set at 14.350 MHz. Choose the filter topology: A simple topology for a low pass filter is the RC filter, which consists of a resistor and a capacitor. The cutoff frequency of an RC filter can be calculated using the formula f_c = 1 / (2πRC), where f_c is the cutoff frequency, R is the resistance, and C is the capacitance. Choose the component values: To achieve a cutoff frequency of 14.350 MHz, we can choose a resistor value of 100 ohms and a capacitor value of 1 nF. Assemble the filter: Connect the resistor and capacitor in series, with the input signal connected to the resistor and the output signal taken across the capacitor. This simple RC low pass filter can be easily implemented using through-hole components on a printed circuit board (PCB). The filter can be powered using a low voltage power supply, and it should provide good attenuation of signals above 14.350 MHz while allowing lower frequency signals to pass through. Interesting. ---John AC9UV

I edited my original subject which creates a new topic. I wanted to correct the type of antenna. The antenna will not be a Zepp. The antenna will be an End Fed Half-Wave Antenna for 40 meter ham band. Enough wire will be provided to construct the antenna and counterpoise. The antenna can hookup to the Sea Spirte+ directly using its built-in NO TUNE antenna coupler which was designed for this antenna. No coax. QSO Today BUILDATHON KIT (#9) SST+ on Mar 25 2023 This is the Sea Spirte+ Kit It also includes a straight key kit. https://qrpme.com/?p=product&id=QSO9 QSO Today Virtual Ham Expo on March 25 - 26 https://www.qsotodayhamexpo.com/ Presentation at the Buildathon on Saturday, March 25th, 2023 at 10:00 PDT (1800 UTC) (1:00 PM EDT) 2-hour session Build a Simple Station and GOTA (Get On The Air!) Speaker: Rex Harper W1REX https://wze95h.qsotodayhamexpo.com/sessionInfo/build_a_simple_station_and_gota_get_on_the This is the follow up presentation on Sunday, March 26th, 2023. https://wze95h.qsotodayhamexpo.com/sessionInfo/we_all_gota_ed_so_what_happened_what_worke This is the original message with incorrect subject. /g/QRpmeKits/topic/ordered_my_march_2023/97026071 Topic where Chuck Carpenter points out that the antenna will be an End Fed Half Wave. Not a Zepp. /g/QRpmeKits/message/461

Gangue, I just discovered this tool a couple of days ago... https://www.mpja.com/40-Watt-Desoldering-Iron/productinfo/16922+TL/ It is a de-soldering iron which is a 40watt soldering iron with build in solder sucker. Brilliant! I just wish I had thought of it! I'd retire and just play with my QRP stuff all day.... Oh wait! I am retired and play with my QRP stuff all day. Well, if I did invent it, I would at least have some money in the bank.... Anyway, I ordered a few for me and made sure my order was processed before I alerted you guys. I haven't got mine yet but the reviews looked real promising so I bought some! Rex W1REX

I did a little research. Many rock-bound CW QRP or QRPp kits come with crytals around 7.030, 7.040, or 7.110. My Two Tinned Tunahs came with 7.110 and another I forget. The March Buildathon and the SST+ will come with a 7110 crystal. What are some other good frequencies/bands to get? I see some crystal specials on the QRPme web site. Of course, other band would require a different band module if you have a Super Tuna, Sea Sprite, Lil Sqal, Sudden Receiver, etc... I tend to hear QRS (Slow Code) around 7.110 - 7.125. Good place to make contacts for CW Newbie hams. SKCC Skeds are a good place to arrange to make contacts. ARRL USA Frequency Allocations https://www.arrl.org/frequency-allocations FCC Part 97 Regulations in the USA https://www.arrl.org/part-97-amateur-radio Novice Historical Society - what the Novice frequencies were in 1957 http://novicehistory.slafetra.org/1951-55/index.html Does anyone know what the Novice frequency range on 40m in 1953 was? 1958 Novice Frequency Privileges: 3.7 to 3.75mc CW. 7.15 to 7.2mc, CW. 21.1 to 21.145mc, CW. FCC CW Band frequencies in USA: 80m: 3.525 - 3.600 MHz: Novice, Technical, General and other ham licenses. 40m: 7.025 - 7.125: Novice, Technician, General and other ham licenses. 30m: 10.100 - 10.150: General and other ham licenses. 20m: 14.025 - 14.150: General and other ham licenses. 17m: 18.068 - 18.110 General and higher 15m: 21.025 - 21.200 General and higher 12m: 24.890 - 24.930 General and higher 10m: All licenses can do 28.000 - 28.300 I did not list the extra frequencies that some licenses have to keep it simple. And I did not list MF nor VHF frequencies. I do not list 60m. Nor do I list ranges for hams outside the USA. I also do not list the VOICE portion of bands the General and higher license have the ability to do CW as long as they follow gentleman agreements. Hams should follow band plans and gentleman agreements. Let's keep the ham radio hobby fun. And just because some hams are rude, stubborn, or do not follow the rules does not mean we should be rude or not follow the rules as well. I am interested in knowing what good watering holes there are for QRP, QRPp, rock-bound radios, radios from QRPme, QRS (Slow Code) and beginner CW operators are. 73 Daniel KK4MRN

Gangue, While Dan has been keeping you all aware of my upcoming Buildathon, I thought you might care for an update from me directly. This will be the 9th & 10th live streamed Buildathon I've done in the last couple of for the QSO Ham EXPO. We have built all sorts of specially designed kits in the past but this Buildathon kit is the one that I am most excited about. I've tried all kinds of simple (or at least I thought so) designs but in reality only one or two hit the mark. The main problem is only having about a 2 hour window to 'Git'er done!'. This year, Eric at QSO Today put a theme to the Expo if I might paraphrase: "Now that you have your license, what's next?" I thunk hard before I pitched my idea to Eric. We would build a VERY simple transceiver in 1 two hour session and then put it on the air and try to make some contacts. Of course, this means extra problems: key & antenna. So I added a simple key and antenna to the build. But the exciting part is the operating. Imagine a BUNCH of identical rigs all operating with the same antenna on the same frequency trying to contact each other. I think this is a really cool idea. The added benefit is this should really either confirm or dispel the myth that you can't make contacts on these very simple QRPp rigs. Another neat thing would be that this could possibly be another WBB (World's Biggest Buildathon) style event the World's Biggest Buildathon & Operating Event. My friend Colin in the UK did a SOTA event where he built a Rockmite station on the summit and used it for his activation. I had 244 builders in the ballroom at FDIM build and test a minimalist 20m transmitter in a little over an hour...with no soldering irons. At the WBBOPE we will have soldering irons and then a special event activating th completed rigs. So I have 50 builders signed up with another four weeks or so before the shipping drop dead date. I have lots of pcbs and parts already on order so I see no problems with getting the kits kitted and out the door on time. Up on my web page for the Buildathon is a map of QTHs for the builders signed up so far, elementary docs for the new kit design and a YouTube link to a real time build of the previous incarnation of the rig. I will post a video of the complete build of the new rig just as soon as I get a board in house. I expedited a few boards so I can get them in sooner in order to generate the docs and a video of the complete build ASAP. Everyone should be well versed on the construction of the kit before we run the live stream event. Now mind you, this is specifically aimed at new licensees so the 7110 frequency in the technician 'Novice' area should be especially receptive to slow code senders and beginners just getting on the air! I will be one of those slow code senders myself! I got to get practicing but QRPme and my wife's Honey-Do list seems to always interfere with my plans. But I will try harder! That's all for now. Rex W1REX

Gangue, I was wondering why nobody ordered an RF Probe kit from me in a long time even after all the RF Probe emails that flew around a few weeks ago. I went looking for them, as I have more than 1 design. While the SMD probe was pretty easy to find on my test equipment button, it was unavailable as I ran out of pcbs for that kit a long time ago. I had produced that kit, from Chuck's, W5USJ, design but tacked it to another kit pcb to get the boards done cheaply. I only ordered that other kit once so never separated the design from that other kit to make individually. I replaced it with through hole design for a Buildathon and listed it as a Buildathon kit but never called it an RF Probe so I lost track of it. Found it, renamed it and listed it as an RF Probe kit (in a test tube) under the test equipment button. I can confirm that it is W5USJ approved! http://qrpme.com/?p=product&id=CT1 Problem resolved.... W1REX

Hello all, Rex updated the QRPme web site the other day to include to the following link: QSO Today BUILDATHON KIT (#9) SST+ on Mar 25 2023 $45 https://qrpme.com/?p=product&id=QSO9 QSO Today Virtual Ham Expo is the first and only on-line amateur radio convention, since August 2020. Event tickets and registration cost $15.00 per person for the Expo weekend and 30 day on demand period March 25-26, 2023 https://www.qsotodayhamexpo.com/ From the QRPme web page: The Sea Sprite Transceiver + is a new re-working of the Sea Sprite currently in the QRPme tuna can line. The original Sea Sprite was reconfigured into a larger sized tuna can, spreading out the parts a little for an even easier building experience. Scroll down and see the "Additional Included Items" for the buildathon. Also, see a previous message from Rex where he said this kit would be a good way for a new ham to get on 40 meters. Features included in the NEW Sea Sprite transceiver+ are: Bigger pcb has more space between components. Bigger pads Wider traces Larger clearances around pads Higher probability of completion without soldering errors Latest low insertion loss low pass filter Reduced parts count for faster building time Added antenna coupler for instant hookup to 1/2 wave End Fed Zepp antenna Additional included items for the QSO Today Expo Buildathon are a straight key kit and enough wire to construct a 1/2 wave End Fed Zepp antenna To GOTA (GetOnTheAir) with everyone else, the builder will need to supply a 12V battery and a set of Walkman style headphones. Of course you will have to have a minimal about of construction tools to build the kit. We are encouraging an online operating event on Saturday night and again early Sunday morning. A whole Buildathon*s (well almost whole) worth of transceivers all operating on the same 40m frequency (7110) at the same time and with the same antenna should provide a practical real time test as to the performance of this QRPp rig. A second QSO Expo session is scheduled on Sunday in which we will discuss the results of the event, provide info as to how to improve your HF operations and also hold a Q&A session as time allows. Docs for the ORIGINAL Sea Sprite are shown below. The new Sea Sprite+ boards are on order and new documentation will be posted as soon as they are developed.... Original message from Rex: /g/QRpmeKits/message/328 Note, the original Sea Sprite transceiver Kit is found here in case you want to build it instead for $30 https://qrpme.com/?p=product&id=SST

On 2023-02-02 8:04 p.m., Daniel KK4MRN via groups.io wrote: > So, on the calculator, enter: 25 ± ÷ 10 = 10x > The 10x really is 10 to the x power but I do not know how to show subscripts or superscripts here. The standard way to indicate exponentiation when all you can do is type in a straight line is this: a^b means a raised to the b power. So you want 10^x. > So, is my dB math correct? It's fine. > Will this work? Yes. But when you flip several switches on your attenuator do not expect extreme accuracy. If you flip the 20 dB, 10 dB, and 2 dB switches you're going to get something close to 32 dB of attenuation but not as close as you might think. The 2 dB attenuator will be pretty close to 2 dB, and the other two will be pretty close to 20 dB and 10 dB, but if your luck is as bad as mine the errors will all be in the same direction and the total error in dB could be as much as 3 times what it is for any one part. Realistically some errors will be on the high side and some on the low side so it probably won't be that bad, but it might be. What you can have reasonable confidence in is that when you've already called for 20 dB and 10 dB attenuation and then flip the 2 dB switch, you're going to have pretty close to 2 dB more attenuation than you had before you flipped it. But the total attenuation might be further from 32 dB than you might think. However it's not going to blow up your tinySA; the error won't be that bad. David VE7EZM and AF7BZ

I am missing a 22pF capacitor in my TTT EZB kit. Can I use 2 count of 10pF ceramic capacitors instead? These either came from Jameco or Radio Shack. I used my multimeter against a 1000pF capacitor which has a value of 1.031nF +/- a few .001nF I added on 10pF, I get 1.043nF I added another 10pF, i get 1.052nF. That last digit is not reliable because it bounces around each time I measure it. So, will these 2 x 10pF work? I have a 33pF ceramic 100V C0G/NP0 I got from digikey. Or would this work? Or do I need to get the actual 22pF capacitor? I am asking so i can go ahead and build the kit. Thanks, Daniel KK4MRN