Search found 662 matches
- Sat Jul 13, 2019 6:42 pm
- Forum: SDR Antennas
- Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
- Replies: 57
- Views: 340390
Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
More reception examples with non-optimized original cross pallet loop antenna. The peculiar thing, that comes to attention at once, is the low level of backgrund noise: under these conditions, signals at levels of -115 to -120 dBm are easily copied witout problems, even if the S meter shows S1 to S3.
- Sat Jul 13, 2019 5:49 pm
- Forum: Spectrum Analysis
- Topic: Evaluating RF filters?
- Replies: 19
- Views: 120014
Re: Evaluating RF filters?
More in-forum references for filter measuremet & evaluation with RSP Spectrum Analyser software: https://www.sdrplay.com/community/viewtopic.php?f=5&t=3943&p=14894&hilit=filter#p14894 https://www.sdrplay.com/community/viewtopic.php?f=5&t=4364&p=14875&hilit=filter#p14875 https://www.sdrplay.com/commu...
- Fri Jul 12, 2019 1:37 pm
- Forum: SDR Antennas
- Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
- Replies: 57
- Views: 340390
Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Hi Phil, I slept on it and was even more convinced this morning, so here is my idea, which is probably the re-invention of the wheel, or perhaps there will be 999 reasons why it will not work. I only have to wait until I get back home in August and test it. METHOD FOR PASSIVE BROADBAND MATCHING OF A...
- Thu Jul 11, 2019 3:18 pm
- Forum: SDR Antennas
- Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
- Replies: 57
- Views: 340390
Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Phil,
It is not coax at all, it is a short section of electrical twin wire, like zip cord. I wish I had coax here, I have nothing!!
Thank you for your calcs. The picture I see is quite simple:
It is not coax at all, it is a short section of electrical twin wire, like zip cord. I wish I had coax here, I have nothing!!
Thank you for your calcs. The picture I see is quite simple:
- Thu Jul 11, 2019 5:57 am
- Forum: SDR Antennas
- Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
- Replies: 57
- Views: 340390
Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Hi Phil & Paul, 1) Very many thanks for the modeling @ 7 Mhz, which is mid-band, as the antenna works fine down to 3.6 and up (best at 14 MHz). The transformer at present is 450 to 1000 Ohm. From your data, at last @ 3.6 MHz, it should be rather 200 to 1000 Ohm, but Z data up to 14 MHz should be nec...
- Wed Jul 10, 2019 7:22 pm
- Forum: SDR Antennas
- Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
- Replies: 57
- Views: 340390
Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Hi Paul, I wish to correct my statement on the abnormal difference in sensitivity between the HI Z and the 50 Ohm input. This has been caused by an unsuitable transformer used on the 50 Ohm input, because being far from home I have very limited resources here. I hope to get suitable 50 Ohm transform...
- Wed Jul 10, 2019 5:24 pm
- Forum: SDR Antennas
- Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
- Replies: 57
- Views: 340390
Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Hi Paul, Do not worry for the 80+, I will turn 80 in september next....so you are in good company. Detailed instructions with pertinent photos are posted here: https://www.sdrplay.com/community/viewtopic.php?f=8&t=4109&start=20 Just patiently go over the thread until you come to the directions for b...
- Wed Jul 10, 2019 1:22 pm
- Forum: SDRuno
- Topic: Diversity - how does it work?
- Replies: 7
- Views: 25243
Re: Diversity - how does it work?
To get the HI Z port going would be really tops!!!
- Wed Jul 10, 2019 12:45 pm
- Forum: SDRuno
- Topic: Diversity - how does it work?
- Replies: 7
- Views: 25243
Re: Diversity - how does it work?
Look here: https://www.sdrplay.com/community/viewtopic.php?f=7&p=16068#p16068 You must go click on SINGLE it will open up so you can click on DIVERSITY. Then it will be all automatic, provided you have two different antennas, one for each 50 Ohm tuner input. You will not believe it, it takes time to...
- Wed Jul 10, 2019 12:40 pm
- Forum: SDR Antennas
- Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
- Replies: 57
- Views: 340390
Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
IMPORTANT Paul I have discovered that I have the best performance using the HI Z input, as I have been doing since yesterday evening and using the following low noise transformer: Toroid core: FT-37-43 (material type 43) Ext. dia.: 0.375" Internal dia.: 0.187" Thickness: 0.125" PRIMARY:5 turns ename...