Thank's for the description , Mike , the distributed inductance on the vertical is interesting , I use a top loading coil with the inv L on 500 ... I did have 2 parallel top wires in rectangular loop
Hi Mike, Am 04.03.2012 10:56, schrieb Mike Dennison: [...] The original question referred to SWR, which in most cases is irrelevant. In practice, my PA makes worrying noises when the antenna detunes
My very rough tests here suggest that a Q of 50 is about right. My current reduces to approx 70% at 1.5kHz off the antenna's tuned frequency. This is a Q of 1.5*2/137 = 46%. It is raining at the mome
Permissible QSY limits for 136 Q what is the average Q of a 136 Khz Ae system ? (back garden + larger) Q What would the maximum acceptable change in frequency +/- Fo before swr considerations became
Thanks all for info 73-G. From: [email protected] Graham Sent: Sunday, March 04, 2012 1:01 AM To: [email protected] Subject: LF: Permissible QSY limits for 136 Permissible QSY limits
Am 04.03.2012 02:01, schrieb Graham: Permissible QSY limits for 136 Q what is the average Q of a 136 Khz Ae system ? (back garden + larger) Maybe arround 50. Q What would the maximum acceptable chang
Am 04.03.2012 02:23, schrieb Graham: Thanks' Stefan, . bit late in the night 50 ? That's quite low , I was expecting much higher ? that's for a 'large' system ? Well if you assume a loss resistance o
Gaham, expecting much higher ? that's for a 'large' system ? do you have a >ball park figure for the max frequency change on that ? For a SWR BW of 1.5 RFsim says around 1.1kHz,that's to say +/- 550H
Thanks' Stefan, . bit late in the night 50 ? That's quite low , I was expecting much higher ? that's for a 'large' system ? do you have a ball park figure for the max frequency change on that ? 1:1.5
