Search found 49 matches

by Paul
Thu Jul 20, 2017 8:31 pm
Forum: SDR Antennas
Topic: RA0SMS active mini-whip power supply
Replies: 10
Views: 209

Re: RA0SMS active mini-whip power supply

Hi Jukka/Heinrich The active mini-whip coax is grounded at the antenna end via a ground-spike and via it's power adapter to the common in-house dedicated earth. Also, I must confess that on further checking there seems to be little CONSISTENT difference in signal quality between the two power suppli...
by Paul
Thu Jul 20, 2017 3:22 pm
Forum: SDR Antennas
Topic: RA0SMS active mini-whip power supply
Replies: 10
Views: 209

Re: RA0SMS active mini-whip power supply

Thanks for the suggestion Jukka.
by Paul
Thu Jul 20, 2017 1:34 pm
Forum: SDR Antennas
Topic: RA0SMS active mini-whip power supply
Replies: 10
Views: 209

Re: RA0SMS active mini-whip power supply

Thanks for your interest Jukka Not as far as i am aware. Either psu is connected to the same, earthed socket and connected by barrel plug to the RF isolating transformer, which is also grounded to my common earth system which is connected to copper a rising cold-water main. this is the best option t...
by Paul
Wed Jul 19, 2017 5:15 pm
Forum: SDR Antennas
Topic: RA0SMS active mini-whip power supply
Replies: 10
Views: 209

Re: RA0SMS active mini-whip power supply

Hi Heinrich Thanks for the response. I do not know the brand (Regulated DC power supply with short circuit protection) - purchased quite a few years ago, but it did check out on spec. Neither psu appear to be "noise generators," but the 13.8V unit produces weaker signals than the 12V origi...
by Paul
Wed Jul 19, 2017 4:30 pm
Forum: SDR Antennas
Topic: RA0SMS active mini-whip power supply
Replies: 10
Views: 209

RA0SMS active mini-whip power supply

Hi I have one of the subject mini-whips. Power requirements stipulate 12 - 14V/300ma and it has worked pretty well on a good quality switched regulator power supply at 12V. I have recently replaced this psu with a presumably superior bench type 13.8V/5-7amp regulated power supply unit, the output of...
by Paul
Sun Jul 16, 2017 4:18 am
Forum: General
Topic: rsp1 drivers
Replies: 4
Views: 229

Re: rsp1 drivers

Hi Mike
I know that this might seem a little "silly," but I've been there....(male - never read the instructions).
However, on several programmes there is a drop-down list that you need to access to select the rsp as opposed to the pre-selected default.
I hope that this may help.
by Paul
Thu Jul 06, 2017 1:33 pm
Forum: SDR Antennas
Topic: Bias T and active mini-whip
Replies: 15
Views: 621

Re: Bias T and active mini-whip

Thanks again for your time and interest Heinrich - I will do just that. And just by the way, the mini-whip now compares very favourably with my 20M simple longwire .
I'm beginning to think that antennae can become an addictive obsession.
Best Wishes
Paul
by Paul
Wed Jul 05, 2017 7:39 am
Forum: SDR Antennas
Topic: Bias T and active mini-whip
Replies: 15
Views: 621

Re: Bias T and active mini-whip

And one very last thing Heinrich (if you have the time) Now that all is hopefully in order, would you consider that there is any advantage from moving from my serviceable (switched) 12v/1200ma half-brick to the 13.8V/5-7Amp more sophisticated unit? It does seem like a no-brainer, but what you said a...
by Paul
Tue Jul 04, 2017 8:50 pm
Forum: SDR Antennas
Topic: Bias T and active mini-whip
Replies: 15
Views: 621

Re: Bias T and active mini-whip

For Heinrich and Andy Thanks for the support and advice with regard to my active mini-whip antenna problems. I have isolated the problem to an intermittent short (I think) in the RG58 cable (an old run). I have replaced this in part and the problem appears to have gone away. All power supplies and a...
by Paul
Sun Jul 02, 2017 5:58 pm
Forum: SDR Antennas
Topic: Bias T and active mini-whip
Replies: 15
Views: 621

Re: Bias T and active mini-whip

It's pretty surely a sporadic power fault - having opened the RF isolating transformer, from it's appearance I suspect that it has very likely overheated and I would guess that what I have been experiencing have been random short circuits. At least the RSP is still delivering the goods and I must sa...

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