Search found 662 matches

by glovisol
Tue Jul 10, 2018 12:38 pm
Forum: SDRplay related
Topic: SDRplay_SDRuno Ver. 1.23.1 HAS BIG PROBLEMS PERHAPS...!!
Replies: 2
Views: 1890

Re: SDRplay_SDRuno Ver. 1.23.1 HAS BIG PROBLEMS PERHAPS...!!

Hello Tech. Support, Today I tried to investigate the problem as per your instructions. I de-installed Ver. 1.23 and re-installed Ver. 1.23.1. SDRuno installed smoothly and I tested it all morning without any problem. I cannot explain what happened yesterday when for half an hour it was mis-behaving...
by glovisol
Tue Jul 10, 2018 7:42 am
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 25156

Re: Testing RSPduo receiver sensitivity with noise generator

Who followed this thread monitored VK7JJ's and my activity in researching, modelling and measuring a classic Beverage long wire antenna. I am now posting the results. BEVERAGE ANTENNA MODEL CHARACTERISTICS & SPECIFICATIONS Antenna length: 135 m. Antenna supports: Receiving end, house wall with tripl...
by glovisol
Mon Jul 09, 2018 6:47 pm
Forum: SDRplay related
Topic: SDRplay_SDRuno Ver. 1.23.1 HAS BIG PROBLEMS PERHAPS...!!
Replies: 2
Views: 1890

SDRplay_SDRuno Ver. 1.23.1 HAS BIG PROBLEMS PERHAPS...!!

Today I downloaded Ver. 1.23.1. I de-installed Ver. 1.23 first, then installed the new version. I found severe intermodulation on all bands and at all settings. There must be severe problems there..... Before re-installing Ver 1.23, I re-installed Ver. 1.22 (even though I operate an RSPduo). I may b...
by glovisol
Sun Jul 08, 2018 9:44 am
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 25156

Re: Testing RSPduo receiver sensitivity with noise generator

Dear Phil, Do not worry, take holiday from "Radio" and enjoy your child, they are such a fantastic company! Today I took readings of the Beverage iust at the starting point, no lead-ins and did the scans both in the unterminated and the terminated condition. Comparing with yesterdays' results today'...
by glovisol
Sat Jul 07, 2018 3:38 pm
Forum: General
Topic: Testing RSPduo receiver sensitivity with noise generator
Replies: 51
Views: 25156

Re: Testing RSPduo receiver sensitivity with noise generator

The "PERFECT" wideband antenna?? Dear Phil, Yesterday I received a brand new Rig Expert's AA-30.ZERO Vector Impedance Anayser. It took 24 hours to make it work, because of a small problem on the PC board, but now it works. Enclosed is the Z = R + JX plot obtained by connecting the antenna leads on ...
by glovisol
Fri Jul 06, 2018 6:01 pm
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18340

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

Hi Jukka,

Thanks for your comments. Your experience will also be very useful and appreciated by all of us.

'73's

Gianfranco
by glovisol
Fri Jul 06, 2018 6:45 am
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18340

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

Hi Tech_Support, I am glad to be of little help in the general understanding of the important revolution in communications which SDRplay receivers have brought about. To an old timer like me, who could experience the cost, the shortcomings and the technical limitations of HF communication receivers ...
by glovisol
Thu Jul 05, 2018 11:16 am
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18340

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

6. TESTING, DIMENSIONING & COMPARING THE MATCHING TRANSFORMER But we must not forget the dynamic range issue. Depending on local conditions, HF frequency band and ferrite core material we can develop a transformer not only with minimum possible capacitance feed thru and ground isolation, but with an...
by glovisol
Thu Jul 05, 2018 10:06 am
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18340

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

5. THE MATCHING TRASFORMER (BALUN) Having designed and built many ferrite wideband matching transformers in my professional life, my idea was to build wireline transformers for this job. As testified by my various posts in the referenced thread, I built many and was able to achieve near perfect matc...
by glovisol
Thu Jul 05, 2018 9:51 am
Forum: General
Topic: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS
Replies: 30
Views: 18340

Re: RSP RECEIVER LOW NOISE HF OPERATION WITH LONG WIRE ANTENNAS

3. COMMON MODE NOISE Old timers in the long past fifties always recommended to youngsters like me (then!) to beware of antenna ground, as a very efficient noise source. The only receiver of the past I can remember with a balanced input was the HRO with a special drawer, the HRO did not have band swi...