Search found 123 matches

by sdrom33
Tue Aug 13, 2019 10:05 am
Forum: General
Topic: You must enter at least two poll options.
Replies: 5
Views: 5113

Re: You must enter at least two poll options.

Very good news, compliments to Tech_Support! This glitch was very annoying.
by sdrom33
Tue Aug 06, 2019 7:37 am
Forum: General
Topic: Accessible SDR for blind users
Replies: 2
Views: 2719

Re: Accessible SDR for blind users

Hi wb9rsq, thank you for your post that made all of us aware of a big problem with Sdr technology. Your mention on the usage of old, conventional equipment gave me the (perhaps impossible) idea that the easiest solution from a blind user standpoint would be to reproduce a mechanical environment inte...
by sdrom33
Tue Aug 06, 2019 5:48 am
Forum: SDR Antennas
Topic: "Low Noise" Vertical Antennas for Receiving
Replies: 12
Views: 1570

Re: "Low Noise" Vertical Antennas for Receiving

But the worst problem of this design is the use of a transistor amplifier. This warrants a separate post. Even though not in the way intended by its designer, still the antenna will pick up some signal. In presence of strong local signals the amplifier will overload, producing any kind of intermodul...
by sdrom33
Tue Aug 06, 2019 5:34 am
Forum: SDR Antennas
Topic: "Low Noise" Vertical Antennas for Receiving
Replies: 12
Views: 1570

Re: "Low Noise" Vertical Antennas for Receiving

Ernestyn, unfortunately this antenna does not deliver what it claims for many reasons. Since you did not get any replies, here I am with my modest opinion. - It is not a capacitive probe because of its form factor (very small surface) and because, as you rightly note, is referenced to ground. - the ...
by sdrom33
Wed Jul 24, 2019 7:00 pm
Forum: General
Topic: RSP-2 HiZ Input Question: 1:9 Balun and Grounding ?
Replies: 7
Views: 846

Re: RSP-2 HiZ Input Question: 1:9 Balun and Grounding ?

Sorry, mikeladd, I do not understand, this last link is different from the first you gave me & it is not a workgroup....can you help/explain?
by sdrom33
Wed Jul 24, 2019 6:12 pm
Forum: General
Topic: RSP-2 HiZ Input Question: 1:9 Balun and Grounding ?
Replies: 7
Views: 846

Re: RSP-2 HiZ Input Question: 1:9 Balun and Grounding ?

Hi Mikeladd, the thread address you uploaded does not work, pse check, thank
by sdrom33
Wed Jul 17, 2019 6:53 pm
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 32
Views: 9422

Re: A FOOLPROOF ANTENNA SWITCH

HI Mike, Your experience is very informative and clearly shows the risks and pitfalls in circuit design. Reliability analysis, based on MIL specs, was done in the company I was working for several years and the most difficult process was that of finding an optimum balance between component count and...
by sdrom33
Tue Jul 16, 2019 6:42 pm
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 32
Views: 9422

Re: A FOOLPROOF ANTENNA SWITCH

Hi glovisol, I agree with Mike that two series capacitors are needed to avoid the danger of shorting the bias voltage. I also note that with the circuit as is now the antenna common lead is shorted to the 12 V supply common lead and this could bring noise in. It would be advisable to put a choke in ...
by sdrom33
Mon Jul 15, 2019 7:41 pm
Forum: SDR Antennas
Topic: A FOOLPROOF ANTENNA SWITCH
Replies: 32
Views: 9422

Re: A FOOLPROOF ANTENNA SWITCH

Hi Tech_Support, I am glad you have eliminated posts with controversial arguments that do nothing but creating confusion and ill feelings among forum members. With sincere appreciation,

Thomas
by sdrom33
Sun Jul 14, 2019 9:30 pm
Forum: General
Topic: Decoding Meteor Satellites with RSP Receivers and SDR Sharp via RTL_TCP server
Replies: 8
Views: 1431

Re: Decoding Meteor Satellites with RSP Receivers and SDR Sharp via RTL_TCP server

Thanks to Mike and to RSP2user for the information and also kudos for very impressive images!