Topics

HF Preselector Power


Ed Pusey
 

Friends, 

I just received my HF preselector. It included a power connector cable without power supply. The connector is either not the correct size, or it is really, really tight, so I have not tried to force it on. In any case, reading the specs on the CCW web site, it appears the unit needs  12 mA from a 12 - 15V DC supply. Does anyone in the group (preferably a user in the United States) have a recommendation on what to purchase, assuming a power supply is required? My simple searches for a power supply that meets the specs produced no results. The best I can come up with is something like this: https://www.amazon.com/SoulBay-Universal-Switching-Selectable-Suitable/dp/B01ISM267G/ref=pd_sbs_23_4/147-2735014-2765860?_encoding=UTF8&pd_rd_i=B01ISM267G&pd_rd_r=02405990-d5c9-415e-82f6-28a632491675&pd_rd_w=iT2GV&pd_rd_wg=hPAYK&pf_rd_p=7cd8f929-4345-4bf2-a554-7d7588b3dd5f&pf_rd_r=1AXDK9399SAF9C117RBF&psc=1&refRID=1AXDK9399SAF9C117RBF

and it has an output of 1.2 amps, well above 12mA.

Suggestions? Many Thanks all. you.

Ed


Chris Moulding
 

Hi Ed,

The DC connector is a 2.1mm socket. The supplied connector will fit but it is a tight fit. Before dispatch it was tested with the cable supplied to confirm that both Preselector and cable were working.

The power supply you link to on Amazon will work with the Preselector but may generate RF interference if it is close to your antenna.

We can supply a RF quiet 12 V power supply at the following link:

http://www.crosscountrywireless.net/12v_power_supply.htm

Regards,

Chris


Ghostwriter66
 

Be careful the power supply you get does not create EMI or RF interference noise ... it will kill the signal 




On Wednesday, February 12, 2020, 05:21, Ed Pusey <esptwo@...> wrote:

Friends, 

I just received my HF preselector. It included a power connector cable without power supply. The connector is either not the correct size, or it is really, really tight, so I have not tried to force it on. In any case, reading the specs on the CCW web site, it appears the unit needs  12 mA from a 12 - 15V DC supply. Does anyone in the group (preferably a user in the United States) have a recommendation on what to purchase, assuming a power supply is required? My simple searches for a power supply that meets the specs produced no results. The best I can come up with is something like this: https://www.amazon.com/SoulBay-Universal-Switching-Selectable-Suitable/dp/B01ISM267G/ref=pd_sbs_23_4/147-2735014-2765860?_encoding=UTF8&pd_rd_i=B01ISM267G&pd_rd_r=02405990-d5c9-415e-82f6-28a632491675&pd_rd_w=iT2GV&pd_rd_wg=hPAYK&pf_rd_p=7cd8f929-4345-4bf2-a554-7d7588b3dd5f&pf_rd_r=1AXDK9399SAF9C117RBF&psc=1&refRID=1AXDK9399SAF9C117RBF

and it has an output of 1.2 amps, well above 12mA.

Suggestions? Many Thanks all. you.

Ed


Ed Pusey
 

Thank you Chris. My order will be on the way momentarily. :-)

Ed

On Wed, Feb 12, 2020 at 6:27 AM Chris Moulding <chrism@...> wrote:
Hi Ed,

The DC connector is a 2.1mm socket. The supplied connector will fit but it is a tight fit. Before dispatch it was tested with the cable supplied to confirm that both Preselector and cable were working.

The power supply you link to on Amazon will work with the Preselector but may generate RF interference if it is close to your antenna.

We can supply a RF quiet 12 V power supply at the following link:

http://www.crosscountrywireless.net/12v_power_supply.htm

Regards,

Chris



--
Ed Pusey

esptwo@...


David Cutter
 

At that current I would be tempted to run a pack of AA cells for the ultimate quiet power supply.  I doubt you will find a "modern" power supply as quiet.

David G3UNA

 

From: CrossCountryWireless@groups.io [mailto:CrossCountryWireless@groups.io] On Behalf Of Ghostwriter66 via Groups.Io
Sent: 12 February 2020 11:44
To: CrossCountryWireless@groups.io
Subject: Re: [CrossCountryWireless] HF Preselector Power

 

Be careful the power supply you get does not create EMI or RF interference noise ... it will kill the signal 



On Wednesday, February 12, 2020, 05:21, Ed Pusey <esptwo@...> wrote:

Friends, 

I just received my HF preselector. It included a power connector cable without power supply. The connector is either not the correct size, or it is really, really tight, so I have not tried to force it on. In any case, reading the specs on the CCW web site, it appears the unit needs  12 mA from a 12 - 15V DC supply. Does anyone in the group (preferably a user in the United States) have a recommendation on what to purchase, assuming a power supply is required? My simple searches for a power supply that meets the specs produced no results. The best I can come up with is something like this: https://www.amazon.com/SoulBay-Universal-Switching-Selectable-Suitable/dp/B01ISM267G/ref=pd_sbs_23_4/147-2735014-2765860?_encoding=UTF8&pd_rd_i=B01ISM267G&pd_rd_r=02405990-d5c9-415e-82f6-28a632491675&pd_rd_w=iT2GV&pd_rd_wg=hPAYK&pf_rd_p=7cd8f929-4345-4bf2-a554-7d7588b3dd5f&pf_rd_r=1AXDK9399SAF9C117RBF&psc=1&refRID=1AXDK9399SAF9C117RBF

and it has an output of 1.2 amps, well above 12mA.

Suggestions? Many Thanks all. you.

Ed


WA8LMF
 

On 2/12/2020 6:27 AM, Chris Moulding wrote:


We can supply a RF quiet 12 V power supply at the following link:

http://www.crosscountrywireless.net/12v_power_supply.htm

Regards,

Chris
_._,_._,_


What exact ferrite cores are you using on the leads of the supply you are selling?


How much effect do they have on noise at HF and VHF?



Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
Home Page:          http://wa8lmf.net

-----   NEW!    60-Meter APRS!   HF NVIS APRS Igate Now Operating  ------
   <http://wa8lmf.ddns.net:14447/>



Live Off-The-Air APRS Activity Maps
   <http://wa8lmf.net/map>

Long-Range APRS on 30 Meters HF
   <http://wa8lmf.net/aprs/HF_APRS_Notes.htm>




WA8LMF
 

On 2/12/2020 12:36 PM, David Cutter via Groups.Io wrote:
 

On Wednesday, February 12, 2020, 05:21, Ed Pusey <esptwo@...> wrote:

Friends, 

I just received my HF preselector. It included a power connector cable without power supply. The connector is either not the correct size, or it is really, really tight, so I have not tried to force it on. In any case, reading the specs on the CCW web site, it appears the unit needs  12 mA from a 12 - 15V DC supply. Does anyone in the group (preferably a user in the United States) have a recommendation on what to purchase, assuming a power supply is required? My simple searches for a power supply that meets the specs produced no results. The best I can come up with is something like this: https://www.amazon.com/SoulBay-Universal-Switching-Selectable-Suitable/dp/B01ISM267G/ref=pd_sbs_23_4/147-2735014-2765860?_encoding=UTF8&pd_rd_i=B01ISM267G&pd_rd_r=02405990-d5c9-415e-82f6-28a632491675&pd_rd_w=iT2GV&pd_rd_wg=hPAYK&pf_rd_p=7cd8f929-4345-4bf2-a554-7d7588b3dd5f&pf_rd_r=1AXDK9399SAF9C117RBF&psc=1&refRID=1AXDK9399SAF9C117RBF

and it has an output of 1.2 amps, well above 12mA.

 

I have one of this exact supply, bought on Amazon.   I use it for "smoke-testing" newly-built gadgets, GPS receivers, soundcard  interfaces, etc.  Since the current is far more limited than the nearly unlimited amps of my main ham shack supply (20A 12 VDC supply in parallel with Exide 120 AH 12 VDC trolling motor battery), the potential for smoke and fire from mis-wired newly-built devices is obviously far less!   

The flexibility of choosing a range of voltages (3 VDC or 5 VDC for GPS devices, 8 VDC for powering many hand helds, 12 VDC for TNCs & sound card interfaces, etc) is great.  In addition to the various size coaxial tips, it also comes with a "tip" that has simple + and - screw binding posts on it.  I connect this one to a short length of red/black zip cord to a pair of Anderson PowerPoles.  I can then use it as a low-current battery maintainer.

So far I have not noticed any noise problems on HF with this supply.


Stephen H. Smith    wa8lmf (at) aol.com
Skype:        WA8LMF
EchoLink:  Node #  14400  [Think bottom of the 2-meter band]
Home Page:          http://wa8lmf.net

-----   NEW!    60-Meter APRS!   HF NVIS APRS Igate Now Operating  ------
   <http://wa8lmf.ddns.net:14447/>



Live Off-The-Air APRS Activity Maps
   <http://wa8lmf.net/map>

Long-Range APRS on 30 Meters HF
   <http://wa8lmf.net/aprs/HF_APRS_Notes.htm>