Dear all, I want to share an experience hat might be interesting for others too: After moving from 501-504kHz to 472-479kHz I noticed that even my lossy antenna needs retuning within the band. As it
Hi Stefan, remote tuning of the loading should be done by optimizing SWR (at the TX), not for maximum RF current. If one keeps that in mind there is no problem. I am not sure if I will keep the remot
I had a look at the M0BMU LF tuning meter and will built it. Does anyone used it on 475/500 kHz? Maybe the transformers need to be adapted but that should be no real problem. 73, Rik ON7YD - OR7T Van
Hi, Rik. I have built Jim's phasemeter and used it on 137 kHz. It seems to work fine on 475 kHz also, although it seems more sensitive on 475kHz. You could take the DC output from the phasemeter and
Hello Gary, Graham, Dave, thanks for the info. I will build the MBMU tuning meter. 73, Rik ON7YD - OR7T Van: [email protected] [[email protected]] namens Gary - G4WG
Hello Alan, Stefan, in my mail I just wanted to point out that maximum current at the TX output (one end of the coax cable) not coincidences with maximum current at the antenna (other end of the coax
Hi Alan, That's exactly what happened to a fellow ham on SW. When he had tuned the vertical antenna at the feedpoint to SWR 1 (ref. to 50 Ohm) he observed a different SWR in the shack. I suggested to
Hi Stefan, Clemens, Alan, the coax is directly connected to the loading coil, no isolating transformer. About induced currents, that is an option but I have some contra indications: 1. I do measure t
Hi Stefan, thanks for the info. In one of the previous mails you asked me about the PA: it is a push-pull class D PA. I am using that type of PA for many years on 136 kHz and 500 kHz (now 475 kHz) to
Hi Rik, Thanks for sharing your experiences. I also didnt expect that this effect is so noticable. What do you plan to do now? I am using a current transformer at the cold end of the loading coil and
Bonjour Rik, Hi Rik, I think it's better to bring the antenna to resonance with a phasemeter such as the M0BMU's one. This avoids the issue of a reactive load to the transmitter. With an inductive lo
Hi Clemens, Yes, and that's why i was asking how the coax is connected to the coil. With an isolating ferrite transformer, these currents are unlikely, at least on 475 kHz. 73, Stefan Am 09.11.2013 0
Dear all, I have already noticed on 160 m that such an isolating transformer was necessary. Without it the SWR changed when connecting or disconnecting other electric equipment in the shack to/from t
Hello Rik, Am 08.11.2013 22:43, schrieb Rik Strobbe: Hello Gary, Graham, Dave, thanks for the info. I will build the MBMU tuning meter. 73, Rik ON7YD - OR7T BTW, i'm using this circuit in addition to
Hi Rik, Am 08.11.2013 16:06, schrieb Rik Strobbe: Hi Stefan, remote tuning of the loading should be done by optimizing SWR (at the TX), not for maximum RF current. If one keeps that in mind there is
Oh yes, or, a phase meter (M0BMU) and a battery operated variometer motor. Without an additional cable to the shack. Then the SWR meter in the shack confirms that everything is fine. 73, Stefan Am 08
Hi All, A suggestion: battery operated tuning device at antenna end and "wireless" link back to shack. Wireless can operate at a non-interfering frequncy (HF/VHF/UHF/Optical). 73 On 08/11/13 16:09, S
Rik, Stefan, I follow your points but there would seem to be something strange in Rik's antenna or his appreciation of what/how its working. Contrary to an earlier assertion, the antenna current flow
Hi Rik, Yes, I used the M0BMU LF Tuning meter for some while on LF & MF with excellent results. But now I use a Scopematch slightly modified to switch to the current sensor mode of the LF Tuning mete
Check on Garys g4wgt web site , the voltage divider was changed for high power 500 work G, From: [email protected] Dave G3WCB. Sent: Friday, November 08, 2013 8:08 PM To: rsgb_lf_group@blac
