Rf isolator ham radio1/1/2024 ![]() ![]() The install was easy with only a couple of small issues that were easily resolved by just thinking things through. I installed the flagpole the end of January here at my home in central Florida. I purchase a 20’ Flagpole antenna that also included the 4’ extension. It could be the difference between hearing a station, or not. RF Chokes can be placed after the radio or after the amplifier.Īgain, the well studied operators add a second RF Choke, 500W or 3500W, immediately after the radio or amplifier. Also, a small RF Choke on the radio side can mitigate QRN, or noise captured along the coax back to the radio station. They are typically installed before the Remote Tuner at the base of your DX Flagpole Antenna or HF Vertical Antenna. Our chokes are rated between 500W to 10 kW and provide up to 5000 Ohms of suppression. ![]() We then match the RF Choke designs (current baluns, RFI line isolators, baluns) around each antenna system's requirements.īy focusing on smaller, peer owned boutique businesses, we are doing our part to share our projects in a niche marketplace and continue to find improvements in the details. Made in the USA by small ham radio owned businesses.īy aligning with multiple well-respected antenna designers and RF engineers we find a better insight into what's available on the market today. We study the market and offer our solutions as 'best of breed' for each antenna system and component. Therefore, Greyline seeks wisdom from expert RF engineers with know-how in ultra high quality and results. I hope for good results here also.RF Chokes are important to get right. Today I’m going to build the power inserter (it’s an active antenna) and try it out. I’ve bought one and brought it last Thursday to the roof. Arie PA3A told me about the AL-1 loop antenna. This didn’t work that great, so my receiver hasn’t seen much action the last couple of years. For my RSP-1A SDR receiver I placed a mini whip antenna on the roof. This seems not to be a problem, as the sun is shining now and I can still listen on the 40 meter band. And, also important: we have a solar panel installation on our roof (without any micro inverters). One OM said the conditions on 40 meter were not that good, so that gives me much hope for the future. This morning I listened to 40 meters again on my Icom IC7300 and heard several people from the UK, Germany and France. But now probably I will try soon to get my toes wet and make a voice QSO. This was the first time I could actually hear what people were saying without being buried in the noise.īecause voice QSO’s were impossible before (with the ATAS 120 and the previous version of the random wire), I never did much with voice. On 80 meters I heard to people from Flanders, Belgium and on 40 meters I listened to several QSO’s made by people from the UK. Yesterday evening I used wfview and spinned the dial on 80 and 40 meters. Maybe I could hear someone very faint in the background, but mostly it was just static. ![]() In the past, HF was always way too noisy. Just hearing Australia was already a first!īelow a screenshot of my logbook with FT8 contacts after I improved the antenna:Īnd here a screenshot of FT8 contacts with the old situation:īut the thing I’m probably the most happy with is that it’s now possible to receive phone QSO’s. This was also very new for me: receiving VK-land with FT8 with a received strength of -13dB. I’ve had more contacts in less time than before. I did also some testing with sending FT8 and the received reports on my signal were also much better. Previous signals were never this strong, even when they were more close by than now. Stations were received with a signal strength between -3 dB to -23 dB. During my whole career as a radio amateur I never had such good results on HF! Not with the Yaesu ATAS-120 screw driver antenna in both by QTH’s in Sliedrecht and Hoogvliet or the previous version of my random wire which I only had here in Hoogvliet. This is a screenshot of of the received FT8 stations on 20 meters during the night of May 26. Not only are received signals much stronger coming in, but also my signal seems to propagate further than before. The result was that the antenna now works 100% better than before. I added a counter poise wire of 7 meters to the 9:1 unun and connected a MFJ 915 RF isolator to the feedpoint of the antenna. November last year I talked to Arie PA3A who gave me a few hints to improve the antenna. Last Thursday (May 18) I climbed the ladder and went on the roof to do the necessary actions on the HF antenna (random wire of 16,2 meters long). ![]()
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