Search found 121 matches

by KL7MJ
Wed Aug 06, 2025 5:29 pm
Forum: Questions & Advice
Topic: 20 M mag loop advice
Replies: 4
Views: 174641

Re: 20 M mag loop advice

That's a cool antenna! I've been playing with a Gawant and an L match recently, but I'm going to try this (and the 80m version too)!
Thanks for sharing!

73,
Mike, KL7MJ
by KL7MJ
Sat Jul 26, 2025 5:41 pm
Forum: Field Kits and Reports
Topic: 20m RockMite success!
Replies: 3
Views: 72349

Re: 20m RockMite success!

Ted,
It was a lot of fun (and frustration). I'm thinking about building a Tuna Tin S, a simple transmitter that uses an Si5351 as the VFO. Hope to hear you on 40!

73,
Mike, KL7MJ
by KL7MJ
Fri Jul 25, 2025 7:39 pm
Forum: Field Kits and Reports
Topic: 20m RockMite success!
Replies: 3
Views: 72349

20m RockMite success!

I built a 20m RockMite several months ago, or at least got to the 90% point and got distracted. Last week I decided to finish it and put it in the traditional Altoids case. Once I got everything situated inside, I was happy to make contacts with POTA stations in IL and MA. Not bad for a little 1/2 w...
by KL7MJ
Fri Jul 25, 2025 7:35 pm
Forum: Questions & Advice
Topic: 20 M mag loop advice
Replies: 4
Views: 174641

Re: 20 M mag loop advice

The short answer is no - a magloop is essentially a large LC circuit, so it needs "C". Having said that, you could use a fixed-value capacitor that will resonate the loop on 14.074, but I'm not sure how sensitive the loop would be from installation to installation. I have a few small verti...
by KL7MJ
Thu Jul 03, 2025 6:57 pm
Forum: Questions & Advice
Topic: No signal out of MFJ-1899t antenna
Replies: 5
Views: 67044

Re: No signal out of MFJ-1899t antenna

You should expect much better performance from a dipole. I've had an MFJ 1899T for a long time. It does work, but it is a very short, compromise antenna. Propagation plays a major role with this antenna, and the bands haven't been very good lately (at least from my QTH).
by KL7MJ
Wed Jul 02, 2025 11:26 pm
Forum: General Discussion
Topic: DIY KH1 - sort of
Replies: 1
Views: 40172

Re: DIY KH1 - sort of

I enjoyed Chris' posts on the carrot. I think I'd like to try it myself, but probably with a (ttr)uSDX, since I already 3D printed the case.
by KL7MJ
Tue May 27, 2025 5:01 pm
Forum: General Discussion
Topic: Greetings from SE Virginia
Replies: 2
Views: 65267

Re: Greetings from SE Virginia

Welcome Marc!

I was down in your neck of the woods a couple of weeks ago, outside of Cape Charles. I had a good time operating my TR-35 and watching the freighters go up and down Chesapeake Bay. The pace was a nice change from northern VA. Hope to hear you on the air!

73,
Mike, KL7MJ
by KL7MJ
Fri May 16, 2025 7:46 pm
Forum: General Discussion
Topic: Simple beam antenna - the G4ZU "Jungle Job"
Replies: 8
Views: 155495

Re: Simple beam antenna - the G4ZU "Jungle Job"

After running the numbers, I assume that the design is metric?

73,
Mike, KL7MJ
by KL7MJ
Fri May 16, 2025 7:36 pm
Forum: General Discussion
Topic: Another approach to the EFHW
Replies: 2
Views: 94358

Re: Another approach to the EFHW

I've used AA5TB's design for years - I don't think the current multiband approach existed when I first started looking for EFHWs. The plus of his design vs. the more common FTx-43 multiband design is that you can tune it for best SWR for each band. The only downside is that it is a one-band-at-a-tim...
by KL7MJ
Fri Apr 04, 2025 7:04 pm
Forum: General Discussion
Topic: Simple ATU
Replies: 5
Views: 185628

Re: Simple ATU

... there's no band switching ... I was just reading through W6SAI's antenna book, and he has a Z-match that switches in additional capacitance that allows a tuner to cover 160 - 10m! I have a ZM-2 (Z-match) as well as some small pi and T-match tuners, and I think the Z-match is the most flexible i...