开云体育

Image of my Loop ( https://ocstuffnz-my.sharepoint.com/:i:/g/personal/sean_oc-stuff_com/EdedtMJJHoBIiuCwUQpnt4QBFzcmLr0XZp8gRl0aTr6hPA?e=bHKfqz )

Never looked at my KiwiSDR2 SNR before. It is now 9..10dB,? local evening. I consider my QTH moderately bad. My current antenna is random L wire, 8m vertical + 12m angled to the ground.? There is a

sean@... added the photo album Orthogonal Loop ( /g/loopantennas/album?id=302470 ) : My Orthoganal loop - made from 2 x 15.9mm annealed copper tube connected to an LZ1AQ -

Hi Everyone, A little background, I have been into SWL for some time and recently got back into the hobby, and went down the slippery slope of SDR ;-) I have a KiwiSDR2, and started with an MLA30+

Looking for a SAL-30? (no mast needed) . Nick VK9DX vk9dx@...

Hello All, Coil and M-521CT tested and added some pictures to https://www.7l4iou.com/2025/04/ag5rt-wideband-90-deg-hybrid-coupler.html about 14.7uH coil rewound from 33uH. Self-resonace, which was a

Dear Whitham, Thank you for your kindness. This wonderful device seems to me, to be of excessive quality. and now I interested in the Hybrid itself and will continue to experiment. Thank you very much

Hello Hisami - I have two Anzac JH-6-4 couplers if you're interested. Contact me off-list at whitreeve@... -- Whitham D. Reeve Anchorage, Alaska USA ---

Hi All, As I thought, T1 material was #75. replaced it with BN-43-2402 (7 turns tapped at 5 from GND) then the high band loss was resolved. about the 2MHz disturbance. conclusion was a error or noise

Hi Mark, Thank you very much. I remembered a mistake I made in the past. I wanted to use M-521CT as just a choke coil for BIAS-T. I shorted the far end and input/output at the near end, but it did not

Hi Hisami, Yes.? For a transformer, you normally short the secondary and measure the inductance across the primary with an RLC bridge or a VNA.? You can also do this for a common mode choke.

Hi Hisami, The problem when using cores with greater permeability, is that the core loss tangent is likely to be greater, and the temperature stability may also be a problem, so you can easily trade

Hi Mark, The construction of the M-521CT is a typical bifilar wound choke coil.

Hi Martin, Thank you for the advice. There is certainly that concern. but Iron Powder material requires a lot of turn, more resistance too. I will try other cores and beads, paying attention to the

You may find that the material used in the 33uH core you rewound for L3 is not best suited at RF frequencies. I have done similar in the past and found the results to be disappointing. Type 2 Iron

Hi Hisami, Unfortunately, the M-521CT data sheet does not have a leakage inductance spec or a differential impedance plot.? I will order a couple next week, put them in my circuit and see how they

Hi Mark, Many thanks for advices. The 1:1 trans I used is M-521CT, made by TOKIN but sold under the KEMET brand. https://www.mouser.jp/datasheet/2/447/KEM_LF0073_M_500CT-3316882.pdf inductance is

Hi Hisami, Thanks for the report!? Your results look great.? Here is a screen shot of my nanoVNA sweep from 2 MHz to 32 MHz -- your results and mine look very similar:

Hi Mark, Thank you very much for the ideal values. It was very helpful. I made one immediately. uploaded ?some pictures on my blog.

It takes a separate phase coherent and stable feedline for each "loop". . . even then, it will require creating a frequency vs phase "map" file and that can be an intersting pursuit. I am pretty sure