LarcSet

[Steve Ulrich/NW0C]

There is an interesting article in the latest issue of QRP Quarterly on the LarcSet 40 meter CW/SSB transceiver kit. 

It is available for $39 plus shipping at:  https://www.hfsignals.com/index.php/larcset/

You can get the schematic and user manuals at: https://github.com/afarhan/larcset/

It looks like a design that could be easily modified for those interested in experimenting.

73, 

Steve - NW0C

[Ken Paulson]

I would be interested in participating in a group buy if some of you want to get the cheaper price.

Ken N0HRL

--
--
You received this message because you are subscribed to the "Minnesota Amateur Radio Technical Society Discussion" list.
 
To post to this group, send email to mn-...@googlegroups.com
To unsubscribe from this group, send email to
mn-arts+u...@googlegroups.com
For more options, visit this group at
http://groups.google.com/group/mn-arts?hl=en
---
You received this message because you are subscribed to the Google Groups "Minnesota Amateur Radio Technical Society Discussion" group.
To unsubscribe from this group and stop receiving emails from it, send an email to mn-arts+u...@googlegroups.com.
To view this discussion visit https://groups.google.com/d/msgid/mn-arts/3dbffb7c-de9a-45da-b072-9edfdf2f8afcn%40googlegroups.com.

[ALLAN KLEIN]

Count me in on a group buy.  It looks like a great deal from a couple of designers who know what they are doing.

Thanks,

Allan Klein, W0NLY

[Mike Burk]

I am in if you get the 5 for the $30 price.

Mike KD0JXE

[Harold Johnson]

That's an interesting concept. I like the prewound trifilar xfrmr and the presoldered surface mounts. (just call me shaky).

And my attenuator may have feet of clay. Does not have a 50  ohm input impedance. I've attached my simplified schematic - omitting all switches. Each 3 resistor section can be selected separately, or any combination can be combined.via individual switches. I may get one in any event, but thought that I'd pass that along. 

73, 

Harry        KF0MAB

On Mon, Jun 1, 2026 at 7:38 PM 'Steve Ulrich/NW0C' via Minnesota Amateur Radio Technical Society Discussion <mn-...@googlegroups.com> wrote:

[Bob Liesen]

Harry,

  I find this non-50 Ohm attenuator very odd.  Can you post the make and model?

Tnx

Bob

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CABOo3jWmE1B_UMiCQCukQ-H%2BRzAf-9S%2BJg1VB29yW-4Ao4vrrQ%40mail.gmail.com.

[Joseph Pankow]

Sign me up for a LarcSet kit if it helps get to the discount threshold. (I'd like one either way.)

73,

Joseph W6JHP

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CAFTpK%3DZNpt-0423CPqwOLA0HSD-Jytud7aD4K0qhFjsSAY3Z-A%40mail.gmail.com.

[Ken Paulson]

Steve and the group:

I have a conflict, so won't be able to make the June meeting on Saturday.  But I would be willing to help out with the group order in any way that might be helpful.  So if there is a list made up, we can talk later about collecting and ordering, etc.

Thanks,

Ken N0HRL

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CALOGdt515exWRoYJmxe%2BeYuyXJpOCCUtK4j5L_zwMGAmAjj6mg%40mail.gmail.com.

[Harold Johnson]

You can find it here 

https://www.qrpkits.com/attenuator.html

The more I read about it, the more I wondered....

I'm not sure if it ever really works.

Harry

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CAO9_kpi_ti6VMLxEB6O8rGN5_wUesqbEcfCs-rpW%3Dm3PXmBokQ%40mail.gmail.com.

[Harold Johnson]

Welp. I looked it over and it's strongly set up for 40 - which I might get to someday. I looked up changing the frequency and it's a non trivial process. 

I guess that there's a very active group of LARC users. There's a good description of issues and fixes here

https://vu3dxr.in/building-the-larcset-v3-real-world-problems-and-fixes/

Interesting rig. Just doesn't fit right now. 

Harry    KF0MAB

On Mon, Jun 1, 2026 at 7:38 PM 'Steve Ulrich/NW0C' via Minnesota Amateur Radio Technical Society Discussion <mn-...@googlegroups.com> wrote:

[Joseph Pankow]

I'd have to pull out my RF Circuits book to remember the details, but both the Elecraft version I built and this qrpkits verison should be a 50 ohm attenuator provided you have a 50 ohm source and a 50 ohm load attached.

You can play around with resistor values here: https://leleivre.com/rf_pipad.html

Pi-attenuator calculator equation here: https://www.digikey.com/en/resources/conversion-calculators/conversion-calculator-attenuator

73,

Joseph W6JHP

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CABOo3jURjo_NFd7dkUOTB4hXUMwmwbQuDyTSWLkemjkAe4DF_Q%40mail.gmail.com.

[Harold Johnson]

Thanks for adding actual science!  When I was trying to figure it out, I didn't add a load R.

Harry 

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CALOGdt44OuF61xAvazVKj%2BXdrcQCv8jhgL%3DwRJ2foimA6TmVdQ%40mail.gmail.com.

[Joseph Pankow]

Ah! now I remember: the parallel combination of R1 and R2 has to be ~50 ohms for the attenuator impedance to match the input/output in both directions.

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CABOo3jWjFt2huP-AsnuwLEi%2BNtMDH1PAGrudYd5Nx_diDPwEAw%40mail.gmail.com.

[Thomas Kent]

I would buy one.  

LARCSET Group

Item #: 18-larcset_group

$175.00

- +

$175.00

$175 for 5 kits, including shipping 

If Steve wants one, that makes 5 people interested:  Steve, Mike, Allan, Ken and Tom.

If everyone agrees to the $35/kit price, I can place the order.  Let me know.

Tom

WM0SS

Thomas A. Kent
SEE Co.
5640 Dewey Hill Rd
Minneapolis, MN 55439-1918  USA
www.seeco.us

On Mon, Jun 1, 2026 at 7:38 PM 'Steve Ulrich/NW0C' via Minnesota Amateur Radio Technical Society Discussion <mn-...@googlegroups.com> wrote:

[Ken Paulson]

Yes, Count me in.  Ken N0HRL

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CAOU1_e_akhmbZyyg6jxx-_cq4%3DZW4ofujqRR1M5ZeTHrEWt5xQ%40mail.gmail.com.

[ulr...@comcast.net]

Let's see if there are any more interested at the meeting on Saturday.

________________________

Steven Ulrich - NW0C

ulr...@comcast.net

---

From: mn-...@googlegroups.com <mn-...@googlegroups.com> on behalf of Thomas Kent <tk...@seeco.us>
Sent: Friday, June 5, 2026 11:39 AM
To: mn-...@googlegroups.com <mn-...@googlegroups.com>
Subject: Re: [mn-arts] LarcSet

 

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CAOU1_e_akhmbZyyg6jxx-_cq4%3DZW4ofujqRR1M5ZeTHrEWt5xQ%40mail.gmail.com.

[Ben Sanders]

I have a migraine coming on so going to miss today - hope it gets recorded.

You can put me down for a kit also if someone is ordering.

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CH0PR11MB54592F7640B4A149AE5CE800FF112%40CH0PR11MB5459.namprd11.prod.outlook.com.

[P Promelas]

Now that I've read over the QRP Quarterly article on the LarcSet I am interested too. 

I'm happy to order on my own but will hold off to see how interest pans out in the club. If you need another to fill out a group of five, count me in. Or, drop my name if you reach 11. 

Steve - that was an amazing video on pcb production! Can you share a link?

Jay - NJ0M

[ulr...@comcast.net]

Tom, 

If you would order a 5 pack that would be great. Here are the names for the order:

Ken Paulson

Joseph Pankow

Mike Burk

Allen Klein

Tom Kent

73,

________________________

Steven Ulrich

ulr...@comcast.net

---

From: mn-...@googlegroups.com <mn-...@googlegroups.com> on behalf of Thomas Kent <tk...@seeco.us>
Sent: Friday, June 5, 2026 11:39 AM
To: mn-...@googlegroups.com <mn-...@googlegroups.com>
Subject: Re: [mn-arts] LarcSet

 

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CAOU1_e_akhmbZyyg6jxx-_cq4%3DZW4ofujqRR1M5ZeTHrEWt5xQ%40mail.gmail.com.

[Mike Burk]

I saw the 1st email 2nd. I do not want 2 - KD0JXE

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CH0PR11MB54590F1A3E82DA23D0418580FF1F2%40CH0PR11MB5459.namprd11.prod.outlook.com.

[Thomas Kent]

OK. I will order one 5 pack for

Ken Paulson

Joseph Pankow

Mike Burk

Allen Klein

Tom Kent

I will place order on Monday, June 8.

Tom

Thomas A. Kent
SEE Co
5640 Dewey Hill Rd
Edina MN 55439 USA
WWW.SEECO.US

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CH0PR11MB54590F1A3E82DA23D0418580FF1F2%40CH0PR11MB5459.namprd11.prod.outlook.com.

[Thomas Kent]

I Have added 

Leon Dill

Ben Sanders

Jay P Promelas

To the Larc set buy list.  The total is now 8.

The group buy price is listed for multiples of 5 units.  

If two more people contact me today then I will order 10 kits.

Tom, WM0SS

Thomas A. Kent

SEE Co
5640 Dewey Hill Rd
Edina MN 55439 USA
WWW.SEECO.US

[ulr...@comcast.net]

Please add my name to the list.

________________________

Steven Ulrich

ulr...@comcast.net

---

From: mn-...@googlegroups.com <mn-...@googlegroups.com> on behalf of Thomas Kent <tk...@seeco.us>

Sent: Monday, June 8, 2026 12:20 PM
To: mn-...@googlegroups.com <mn-...@googlegroups.com>
Subject: Re: [mn-arts] LarcSet group buy

 

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CAOU1_e9H-rY1X7gf7RxgVz3CfyxSY7Su7%2BKVb57egRN9-BXYdQ%40mail.gmail.com.

[Thomas Kent]

I added Steve Ulrich to the LARC kit order list.

That makes the total now 9.

I placed an order with HFSignals.com for 2 x 5 =10 kits. I will pass along shipping information when available.  Should ship within 5 days.

Tenth unit is up for grabs.

Once I receive the kits, send me the $35 via check to address below or pay via PayPal using my personal email address 

TKEN...@GMAIL.COM

You are welcome to pick up your kit at my place or I can bring them to the next club meeting.

Tom

Thomas A. Kent
SEE Co
5640 Dewey Hill Rd
Edina MN 55439 USA
WWW.SEECO.US

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CH0PR11MB5459DAC8B324742EA438CAB9FF1C2%40CH0PR11MB5459.namprd11.prod.outlook.com.

[P Promelas]

Thanks Tom! Keep us updated on any tariff or additional charges.

Jay Maher - NJ0M

[Thomas Kent]

The ten Larc kits arrived.

Send payment via check, cash or PayPal.com (PayPal ID TKEN...@GMAIL.COM)

You can pickup at my home address below.  Text me beforehand.

I will bring remaining kits to next club meeting.

There is one extra kit available.

Tom

Thomas A. Kent
SEE Co
5640 Dewey Hill Rd
Edina MN 55439 USA
WWW.SEECO.US

To view this discussion visit https://groups.google.com/d/msgid/mn-arts/CH0PR11MB5459DAC8B324742EA438CAB9FF1C2%40CH0PR11MB5459.namprd11.prod.outlook.com.