Search found 658 matches

by glovisol
Sat Jul 20, 2019 11:30 am
Forum: SDRplay related
Topic: SDRplay transceiver?
Replies: 4
Views: 636

Re: SDRplay transceiver?

They should, more than half of the job is done, already.
by glovisol
Fri Jul 19, 2019 3:19 pm
Forum: New Users' experiences
Topic: Best antenna no good signals?
Replies: 21
Views: 3147

Re: Best antenna no good signals?

Hi Phil, Lovely and amusing idea. I wish to add my bit. In reality it is not "Perfect is the enemy og good". The old Italian proverb says: " il meglio è nemico del bene " which translated, means: "Better is the enemy of good" In this case, forgive the pun, "better" is better than "perfect".... But v...
by glovisol
Tue Jul 16, 2019 11:04 am
Forum: SDRuno
Topic: AM Broadcast Stations on 22 MHz
Replies: 17
Views: 1288

Re: AM Broadcast Stations on 22 MHz

Hi VK3MHZ, Yes, use a high pass filter, as shown here: HIGH PASS FILTER FOR OPTIMUM HF RECEPTION https://www.sdrplay.com/community/viewtopic.php?f=5&t=3973 If you go to the last posts of thread above, you will see how the filter eliminates all spurious & images. Please understand there are limitatio...
by glovisol
Tue Jul 16, 2019 10:09 am
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 32
Views: 9477

Re: A FOOLPROOF ANTENNA SWITCH

Hi Mike, No hard feelings at all, in fact I am very glad we can seriously discuss this antenna switch. First of all we must clear possible misunderstandings. 1) This antenna switch is NOT an antenna commutator in the usual sense. THERE IS NO CONNECTION AT ALL TO A TRANSMITTER OUTPUT. What the relay ...
by glovisol
Tue Jul 16, 2019 6:48 am
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 32
Views: 9477

Re: A FOOLPROOF ANTENNA SWITCH

THE HAIR IN THE EGG METHOD It is a long time that I had in mind to write what follows, but I needed a third party who would independently confirm that there is nothing wrong with the "Foolproof Antenna Switch" which was erroneously labelled "A Fool's Antenna Switch" by one contributor to this threa...
by glovisol
Mon Jul 15, 2019 8:32 pm
Forum: SDR Antennas
Topic: Receive Antenna & Impedance "Matching"
Replies: 114
Views: 16249

Re: Receive Antenna & Impedance "Matching"

Hi Phil, Even if I have not been commenting, I have been following your WSPR activity, as described in this thread, an activity which I think is more than interesting, it is fascinating. I am afraid to get involved, as I am afraid it will capture my attention completely, However, if my input can be ...
by glovisol
Mon Jul 15, 2019 4:09 pm
Forum: Spectrum Analysis
Topic: Evaluating RF filters?
Replies: 19
Views: 1565

Re: Evaluating RF filters?

This filter is simpler & easier to make, it would be good as a first experimental unit. It is a Chebyshev N=5, r=0.5 dB, Zin=Zout=500 Ohm as the previous Cauer filter.
Chebyshev MW band elimination notch filter.jpg
Chebyshev MW band elimination notch filter.jpg (57.26 KiB) Viewed 635 times
by glovisol
Mon Jul 15, 2019 3:13 pm
Forum: Spectrum Analysis
Topic: Evaluating RF filters?
Replies: 19
Views: 1565

Re: Evaluating RF filters?

ERRATA CORRIGE: in the schematic I omitted to put the value of the capacitor in series with the 336 uH inductor: value is 215 pf. Sorry for that!
by glovisol
Mon Jul 15, 2019 2:41 pm
Forum: SDR Antennas
Topic: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna
Replies: 59
Views: 5586

Re: LW-MW-SW Relay Tuned 15' Noise Reducing Vertical Antenna

Hi Phil, it is exactly that. You pushed me and I am now going full blast. Yesterday I increased the side of the square from 88 cm to 1.29 cm. The practical footprint space actually taken by the antenna is the same, but the capture surface has more than doubled, from 0.77 sq. metres to 1.66 sq. metre...
by glovisol
Mon Jul 15, 2019 1:53 pm
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 32
Views: 9477

Re: A FOOLPROOF ANTENNA SWITCH

Thanks again, Tech_Support, for defending our Forum,

Gianfranco