To: | [email protected] |
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Subject: | LF: Re: Antenna relays - multifilar Litz coil |
From: | Markus Vester <[email protected]> |
Date: | Thu, 19 Nov 2015 16:55:32 -0500 |
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In-reply-to: | <7E7DFBB4D102A04DB5ADC88D66628A4A4447680B@ICTS-S-MBX1.luna.kuleuven.be> |
References: | <7E7DFBB4D102A04DB5ADC88D66628A4A4447680B@ICTS-S-MBX1.luna.kuleuven.be> |
Reply-to: | [email protected] |
Sender: | [email protected] |
> Marcus offered an interesting alternative, but the bifilar loading coil would need to have a low DC resistance (thus heavy wire).
My former loading coil was made of RF litzwire, 243 x 0.05 mm strands. These strands are grouped in 3 bundles, which can easily be separated and soldered individually. I haven't measured characteristic impedances of the resulting trifilar line, but I think it would be useful for DC as well HF as long as the differential voltage is not too large. > I am not sure a (lossless) capacitor in parallel with the coil will lower the antenna efficiency. I think it would increase the coil losses, compared to a higher inductance coil of same Q, without the capacitor.
Pcoil = I*U/Q
At same radiated power, you'll have the same voltage but higher coil current due to the extra capacitor.
All the best,
Markus (DF6NM)
-----Ursprüngliche Mitteilung----- Von: Rik Strobbe <[email protected]> An: rsgb_lf_group <[email protected]> Verschickt: Do, 19 Nov 2015 9:27 pm Betreff: RE: Re[2]: LF: Re: Antenna relays Hi Chris, |
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