Question / Mike Harding
Submitted: Saturday, Dec 29, 2007 at 00:29
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Replies:
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Member - Doug T (FNQ)
Mike
What amp/size 240v / 13.8VDC POWER SUPPLY would be required to run the Transciever below, would Output: 13.8Volts DC Load: 6Amp normal, 8A Max be OK
Features: PLL Synthesised mobile all mode tranceiver with large illuminated LCD Digital Bargraph Display, 5 digit LCD frequency readout Frequency: 25.160 - 29.700MHz (Export Version) Frequency Tolerance: 0.0005% Frequency Accuracy: 110ppm or better Output Power: 30watt AM/SSB/CW PEP & 25watt max. FM Spurious Emission: -60dB or better Carrier Suppression: -40dB or better Meter Functions: Signal S/RF, RX Receive Signal Strength, Modulation, SWR Calibration, SWR Others: Mic - 600 Ohms, Dynamic PTT Dimensions: Size 2 3/8" x 7 7/8" x 9 1/4" Weight 1.8kg
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Reply By: 96 GXL 80 series - Saturday, Dec 29, 2007 at 00:35
Saturday, Dec 29, 2007 at 00:35
Hi Doug,
you would need a 10amp Power supply to be comfortable and a min 8amps
cheers
96
AnswerID:
278833
Follow Up By: Member - Doug T (FNQ) - Saturday, Dec 29, 2007 at 00:49
Saturday, Dec 29, 2007 at 00:49
96 GXL 80
Hmmm ..... then a 12v battery in the caravan would be or could be a cheaper way, and run the $330 Redarc Charger on it , If the radio was run at 5w AM/12w LSB then a lower amp' unit would be OK , but I guess it would run out of puff if one were to crank up the power.
SYNCRO
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FollowupID:
542899
Follow Up By: 96 GXL 80 series - Saturday, Dec 29, 2007 at 01:09
Saturday, Dec 29, 2007 at 01:09
Doug,
yes you can use the battery and it is a good filter for the radio as
well.
will help keep a clean audio.
You can use a 4 amp charger on the battery that way and will be enough.
If you need a supply yell out as I have 2 spare 25amp supplies here doing nothing.
I have all Kenwood amateur gear that I use on the Amateur Bands.
Cheers
96
FollowupID:
542900
Follow Up By: Member - Doug T (FNQ) - Saturday, Dec 29, 2007 at 01:39
Saturday, Dec 29, 2007 at 01:39
96
OK Thanks , will keep a note of the offer in the old
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FollowupID:
542901
Follow Up By: Bonz (Vic) - Saturday, Dec 29, 2007 at 06:19
Saturday, Dec 29, 2007 at 06:19
Just curious, Why wouldn't a 6a max 8a power supply do the trick allowing a max 30w at 50% efficiency then 6a would do it , wouldn't it? What am I missing?
Thats said I also agree a battery is an excellent power supply filter
FollowupID:
542904
Follow Up By: Mike Harding - Saturday, Dec 29, 2007 at 07:41
Saturday, Dec 29, 2007 at 07:41
I tend to agree Bonz - it's a 30W radio (and only 30W on SSB so very short power peaks). However using a battery is a good way to go Doug, I run one of my high power Amateur sets that way.
Whatever you do avoid switched mode power supplies for
HF radio use! At 27MHz they _might_ not be too bad, only way to tell is to try an individual supply, but the radio noise they generate due to the switching is a killer at HF. A linear power supply or battery is the way to go.
Mike Harding
FollowupID:
542907
Follow Up By: Member - Doug T (FNQ) - Saturday, Dec 29, 2007 at 09:58
Saturday, Dec 29, 2007 at 09:58
Mike
Thanks for your answer, Bonz also for your input. While the radio is capable of transmitting on the frequencies as per the specs I never use them because I have no antennas to suit the frequencies other than high 26Mhz and 27Mhz to about 27.500, I have had the radio for about 3 years , it's in the car and never gets used much now so I thought I might install it in the Caravan,
The antenna I have is set for 27Mhz but I have listened on the 28Mhz and 29Mhz but have no interest there, so I think this supply below would be ideal yaking your advice.
Output: 13.8Volts DC Load: 6Amp normal, 8A Max Others: Short-circuit protection Dimensions: 175mm x 160mm x 90mm Weight: 3.30 Kg
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FollowupID:
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Follow Up By: Member No 1- Saturday, Dec 29, 2007 at 10:54
Saturday, Dec 29, 2007 at 10:54
output 30watts is not input power?
FollowupID:
542924
Follow Up By: Mike Harding - Saturday, Dec 29, 2007 at 11:03
Saturday, Dec 29, 2007 at 11:03
Correct - the process of converting electrical energy to radio frequency energy is a very inefficient one at our current state of technology.
I have a, very modern, 100W RF power transceiver which requires 22A at 13V8 DC input (303W) to produce it's maximum output. From memory a 600W microwave oven will typically require something like 1200W of input power. A rule of thumb to calculate the input power needed is to take the RF output power, multiply it by two and add a bit for rainy days :)
Mike Harding
FollowupID:
542927
Follow Up By: Mike Harding - Saturday, Dec 29, 2007 at 11:06
Saturday, Dec 29, 2007 at 11:06
PS. I should mention that all the "lost" energy is dissipated as heat by the electronic components of the transmitter which is why most transmitters (especially SSB) are not specified for 100% duty cycle.
FollowupID:
542928
Follow Up By: Redeye - Sunday, Dec 30, 2007 at 15:25
Sunday, Dec 30, 2007 at 15:25
Hi there all,
If you look at this URL you will find the maximum current draw during Tx is 6.5 Amps
http://www.rigpix.com/cbfreeband/magnum_deltaforce.htm
As stated a battery with a charger is the best bet. The charger will not have to be greater than 6 amps unless you are going to talk 100% of the time. During your Rx periods you will be charging the battery.
Redeye
FollowupID:
543061
Follow Up By: Member - Doug T (FNQ) - Sunday, Dec 30, 2007 at 15:57
Sunday, Dec 30, 2007 at 15:57
Redeye
Thanks mate, now thats the kinda answer I like to see, 10/10 for you , the web page I needed .
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FollowupID:
543067
Follow Up By: Member - Doug T (FNQ) - Sunday, Dec 30, 2007 at 16:00
Sunday, Dec 30, 2007 at 16:00
Redeye
I might also add that I ask a question looking for answer such as yours, not a lecture on issues I already knew .
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FollowupID:
543069
Reply By: Tony MD - Saturday, Dec 29, 2007 at 11:15
Saturday, Dec 29, 2007 at 11:15
Hi Doug, why don't you try the power supply (assuming you have one) & see. I concur that with the load & duty cycle, it will probably be OK.
I have had some experience with older but similar radios - HR2510, President Lincon &
Ranger. Maintaining voltage / voltage drop were issues on battery & a too small a power supply. They didn't like anything less than 1bout 12.6 volts. A brief introduction as to how a linear power supply works may help? Hope that it is not too tech!
With a power supply, the actual transformer will be rated at probably 16 to 18 volts (RMS). Once converted to DC through a rectifier & with some filtering capacitors, the pre-regulated voltage will be in the order of 25 volts (the filter capacitors will be charged to the peak voltage - RMS =.707 x peak). Through the voltage regulators & control circuitry, this is reduced to 13.8 volts regulated. The more current that is required - the more the control circuitry is turned on (a bit like a
water tap) in order to maintain a steady 13.8 volts output at a higher current output. With power supplies that are too small, the regulation circuitry can't handle the high current demand, the transformer becomes saturated & voltage drop at the power supply output occurs.
What about a solar panel on to the battery?
Cheers & happy new year, Tony.
AnswerID:
278862
Reply By: Member - Raoul (Snake) H (QLD) - Saturday, Dec 29, 2007 at 22:11
Saturday, Dec 29, 2007 at 22:11
Hi Doug, Everyone has failed to tell you that the radio is ILLEGAL to use on Aust.HF Citizen Band.It is not type approved for CB and the only people able to use it legally would be Amateur Radio Operators.I suggest you contact the ACMA before you spend any $$$$$. Cheers Snake
AnswerID:
278916
Follow Up By: Member - Doug T (FNQ) - Saturday, Dec 29, 2007 at 23:11
Saturday, Dec 29, 2007 at 23:11
I was wondering when someone was going to nail me for that, I started using CBs in the mid 1970s in the truck, the 23 ch Realistic from Tandy was illegal then too, thanks anyhow,
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FollowupID:
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Follow Up By: 96 GXL 80 series - Sunday, Dec 30, 2007 at 00:27
Sunday, Dec 30, 2007 at 00:27
Raoul (Snake) H,
The only bands that are legal to amateurs are from 28.000 to 29.700 so the rest are illegal full stop.
I hear the Radio Inspector up North is pretty hot on interference and illegal radio's.
I wouldn't advertise it too much, especially on air what you are running.
Doug, not sure if you have followed Amateur radio of late, but they have dropped the CW and have brought in the Foundation class license "F Call"
You are restricted to 10watts only but at least it covers your gear.
I mean this in a friendly way.
After all we were all illegal when 11mts was taken away from Amateurs.
Cheers
96
FollowupID:
543012
Follow Up By: Member - Raoul (Snake) H (QLD) - Sunday, Dec 30, 2007 at 01:01
Sunday, Dec 30, 2007 at 01:01
96GXL
Im not advertising anything just trying to help another person.
Iam an Amateur Radio Operator.
(After all we were all illegal etc) No we werent,as the 11Mtr band was set aside for the advent of legal HF CB Radio.Before Hams gave up 11Mtrs some operators (Pirates)were operating on the band. It was thought in some circles that HF CB would die off in a couple of years and they never thought it would take off like it did.Anyway I wont go further on the subject.
Cheers to All. (10/4 good buddy)
Snake
FollowupID:
543013
Reply By: Member - Raoul (Snake) H (QLD) - Saturday, Dec 29, 2007 at 23:26
Saturday, Dec 29, 2007 at 23:26
Doug,I assumed that by asking about the power supply you were a newcomer to radio.I dont care what rig or what power you use I simply wanted you to be aware that it was illegal.I too have been around since 1972 on 27Mhg but it does not make the radio you mention legal to use on Aust Citizen Band.The 10 meter Amateur band is 28.000 to 29.700. The NZ CB go from26.330 to 26.770.Also only 12Watts PEP is allowed.Cheers Snake
AnswerID:
278924
Reply By: 96 GXL 80 series - Tuesday, Jan 01, 2008 at 19:38
Tuesday, Jan 01, 2008 at 19:38
Hi Doug,
just to let you know, if you have a 4 or 6amp power supply, you can use that as a charger to run the battery off and connect the radio up that way.
Power supplies are no different to a battery charger.
Happy New Year.
96
AnswerID:
279257