Conversation

Notices

1. Embed this notice
   John K2ZA (k2za@mastodon.hams.social)'s status on Saturday, 27-May-2023 04:36:59 JST John K2ZA

   in reply to

   • sparseMatrix 📻

   @KI5SMN Here’s a pdf with a very practical dummy load project…

   http://snocohams.net/docs/DummyLoad.pdf

   • James Morris likes this.
   • Embed this notice
     sparseMatrix 📻 (ki5smn@mastodon.hams.social)'s status on Saturday, 27-May-2023 04:37:04 JST sparseMatrix 📻

     in reply to

     @k2za

     Ha, yes I do have a 50 ohm load then. I might have an adapter.

     Also, I have a soldering iron and would be quite interested in making something that could be useful at higher loads.

     Point me at some deets, I got a bunch of typical resistors too

   • Embed this notice
     sparseMatrix 📻 (ki5smn@mastodon.hams.social)'s status on Saturday, 27-May-2023 04:37:05 JST sparseMatrix 📻

     in reply to

     @k2za

     Also I should probably mention I do not have a dummy load.

   • Embed this notice
     John K2ZA (k2za@mastodon.hams.social)'s status on Saturday, 27-May-2023 04:37:05 JST John K2ZA

     in reply to

     • sparseMatrix 📻

     @KI5SMN If you have the calibration loads for the VNA, you do. One of them is 50 ohms. You will probably need an adapter though. They’re also very easy to build if you have a soldering iron…

   • Embed this notice
     John K2ZA (k2za@mastodon.hams.social)'s status on Saturday, 27-May-2023 04:37:06 JST John K2ZA

     in reply to

     • sparseMatrix 📻

     @KI5SMN Hang a dummy load at the antenna end of the feed line. If your element lengths are in the ball park the SWR shouldn’t be that high (3 or 4:1 would be more believable). There is something else going there I think…

   • Embed this notice
     sparseMatrix 📻 (ki5smn@mastodon.hams.social)'s status on Saturday, 27-May-2023 04:37:07 JST sparseMatrix 📻

     MEANWHILE BACK IN RADIOLAND...

     So, the current state of my antenna is, it's up, straight through, no balun/un-un, and reads ~18:1 SWR.

     If I understand correctly, my next step to getting it fully operational again is to adjust the element lengths and shoot it with the VNA again, yes?