Hi Chris, Am 14.10.2015 13:35, schrieb Chris Wilson: [...] It's far from optimal right now, ...but your first signals are better then that of many other UK stns in the past few years (except G3KEV :-
Hi Andy, I cannot hear him here at -17 dB SNR in WSPR-2. You can hear him. So, will you try a CW QSO with him? :-) If he improves his station, more stations could hear him. And maybe he will get repo
Hi Mal, Are you trying to transmit DFCW? There is no DFCW-shift it seems... 73, Stefan My MF garbbers: City: http://www.iup.uni-heidelberg.de/schaefer_vlf/DK7FC_MF_Grabber.html Garden: http://www.iup
Am 15.10.2015 19:14, schrieb John Andrews: [...] This protects well against RF-swamping and nearby lightning hits. The down-side is that you have to supply the current to run the relay. German ops wh
Hi Luis, My congrats!!! This is a very good result for an unloaded 10m vertical antenna! The coil will make a big difference, a few 10 dB i expect, although this is hard to imagine since your reports
Hi all, Despite mostly overcast wx i spend 3 hours into the tree today. Now the first of 3 accus is on the board, still not used. Also, the (mono-) MF-RX is up and a shielded USB-soundcard is connect
Hi Luis, Be careful with running a mismatched PA. It may not blow up the FETs but maybe a C in the output filter. And the filter will not work very well too. I guess you know how to match the antenna
Hi Ken, I would first transform to 50 Ohm using a BIG ferrite core and then use iron powder cores to build the LPF. T-200-2 types work fine on MF for decent power levels :-) 73, Stefan Am 17.10.2015
PS: For the RF transformers i often use N30 ferrite material with good results. An AL of 4000 nH or above is a good choice. If you want to use Amidon ferrite cores, use type 77 material (available on
Hi Martin, Or maybe you're using a USB soundcard sampling at 48kS/s and your PC is set to 44.1kS/s, giving a certain frequency offset? 73, Stefan Am 17.10.2015 22:11, schrieb Martin Evans: Ah - thank
Hi, I took a FT-240-77 in my large PA a while ago. The primary winding can be seen here: https://dl.dropboxusercontent.com/u/19882028/MF/20130713_002528.jpg 47 turns were fine to switch a 475 kHz (ne
Hi Luis, Am 18.10.2015 00:49, schrieb VIGILANT Luis Fernández: Hi Stefan Yes. I have already doubled the voltage rate of the output filter. It was the second thing that failed when transmittin
Hmm, the timing is correct? You're using USB not LSB, if you're using a HF TRX for receiving? 73, Stefan Am 18.10.2015 21:26, schrieb Martin Evans: Well, I've followed Marcus' and Tobias' instruction
Hi Martin, Another thing, maybe: Did you disable all "sound improvements" on Win7, such as AGC or "bass booster" and similar nonsense? And maybe there is a loop somewhere? Maybe you can check to mute
Hi Luis, Am 18.10.2015 21:59, schrieb VIGILANT Luis Fernández: For the transformer I plan to recycle the one osed for the loop. It has two big toroids 80mm external diameter and 8mm thick. Bot
Hi Luis, Nice looking coil. It has a good ratio between diameter and length although it would have been better to have a small gap between the wire turns. And i didn't expect that you need so much L.
Hi Luis, Lol. Yes, maybe an antenna analyzer helps to understand things. For the coil i would use isolated mains electric wire. We have 1.5mm^2 and 2.5mm^2 here in DL. Also there is 0.75mm^2 for some
Am 19.10.2015 21:15, schrieb Clemens Paul: http://no.nonsense.ee/qthmap/?qth=JN68KJ79WJ 73 Clemens DL4RAJ Wow, i had to scroll out 7 times before i found a city that i know. And i have a large monito
I confirm, see attachment. 73, Stefan Am 19.10.2015 21:42, schrieb Mal Hamilton: Not on the same QRG Sent from my iPhone This message cannot be displayed because of the way it is formatted. Ask the s
