IMO can't go wrong with the Balun Design products. Nice selection, support, well worth the investment from what I believe is a quality product. Nothing negative about W2DU product so cannot speak to
MyAntennas.com has top quality baluns, IMO better than Balun Designs. https://myantennas.com/wp/ 73, Maximo --Original Message-- From: TowerTalk [mailto:towertalk-bounces@contesting.com] On Behalf
The one sent to me by another ham was very well built. Unfortunately, it did not measure anything like the plot that was on their website. When I asked a few questions, the plot disappeared. Comments
That's the only reason I can think of. The materials are inexpensive, especially if you buy the cores from industrial vendors in reasonable quantity, sharing those you don't need with fellow hams. 73
The 1:1 shown is exactly the same as Balun Designs. Except for the housing. Jim W7RY https://myantennas.com/wp/ 73, Maximo --Original Message-- From: TowerTalk [mailto:towertalk-bounces@contesting.co
Do you know that it's the same ferrite mix? That makes a huge difference, and #31 the only one I've found that yields REPEATABLY good high Rs values at HF. #43 and #52, which can provide high enough
No. I don't know that for sure. W7RY Do you know that it's the same ferrite mix? That makes a huge difference, and #31 the only one I've found that yields REPEATABLY good high Rs values at HF. #43 an
Jim (K9YC), When making Rs measurements are you using the S11 or S21 method? Steve, G3TXQ was an advocate of S21 while Owen, VK2OMD claims S11 results in better accuracy with high Rs values. I've bee
Hi Paul, I made S21 measurements using a test jig quite similar to Steve's. His measurement technique seemed quite good. The (major) shortcoming of his work is that he measured only chokes on only a
Hi Jim, Happy Christmas. Regarding the test jig, Are you still using that one made of Teflon board with short coax tails to the D8SAQ ? Thanks 73, Máximo EA1DDO www.EA1DDO.es --Original Message-- F
Paul, there is a document somewhere showing S21 better (more accurate) results to S11. I need to look for that doc. 73, Máximo EA1DDO www.EA1DDO.es Jim (K9YC), When making Rs measurements are you u
73, Máximo EA1DDO www.EA1DDO.es There's a nice application note from Copper Mountain that looks at uncertainty in S11 vs S21 measurements of impedance. As one might expect it varies with the magnitu
I made S21 measurements using a test jig quite similar to Steve's. His measurement technique seemed quite good. The (major) shortcoming of his work is that he measured only chokes on only a few cores
No, that was to accommodate the very large cores. My standard jig is one that strongly resembles Steve's. 73, Jim K9YC _______________________________________________ ________________________________
On 12/25/2022 8:15 AM, Lux, Jim wrote: The material datasheet claims 20% uncertainty in the properties (although I don't know if that is "run to run" or "piece to piece within a run") - They're sinte
I can see that my initial request included far too few details. Thanks for the many good responses. The responses were very helpful for me. I'll try to refine my request. 1) Approximately 5000 ohms
Hi Rich, You can get a commercial choke showing in excess of 5K Ohm at 28 Mhz, up to 3Kw: https://myantennas.com/wp/product/cmc-130-3k/ If you prefer to build it yourself, you just need to follow Jim
Hi Maximo, Thanks for directing me to the MyAntennas site. Their Choke Baluns and Common Mode Filter Chokes seem to have very good performance. Have you used them yourself? TNX and 73, Rich, N6KT On
Hi Rich, Not myself, but someone else in this group. It seems the device shows on the field the advertised specifications. The guy behind it is a RF engineer, coming from Cushcraft antennas. I would
https://www.onallbands.com/baluns-and-common-mode-impedance-how-much-is-enough/ On 12/26/2022 5:53 PM, Richard Smith wrote: I can see that my initial request included far too few details. Thanks for