What power supplies would you recommend? linear or switching ?
whats's the ideal Power Supply Peak Output Amp.? and VDC ?
No one has mentioned the cable between Flex and PS. An additional 15A can result in a several volt drop in wiring, connectors, and especially fuses.
I use 8ga from battery through a marine grade 50A breaker to a 75A to 4x45A powerpole cube. From that cube to the Flex goes through 10ga wire with no fuses
1. Definitely avoid switching supplies..they all by design generate RF Noise.. some of the better brands have a knob to allow you to change the RF noise frequency but why bother... A good linear supply is much better without the noise issues
2. Do not undersize your power supply.... Most ham supplies are rated at peak rather than Average Power.. So a 35A Peak Supply likely will only handle 25A Average. A 100W Ham XCVR needs at least 20-25A Average and as much as 25-40A Peak.. so a reasonable supply would be a Astron 50A peak Linear Supply.
3. Do not use small cables- At currents of 40 A can produce quite a voltage drop over even a relatively short cable... #10 wire will work to 1Meter, #8 to 2 Meters, #6 for longer than 2 Meters..But you should also keep your cables as short as possible to reduce voltage drops..
Be careful with any cascaded Powerpoles, including Powerpole cubes; they can easily add up to a significant voltage drop at 20A-DC. This can undermine the benefit of using heavy gauge wire. I would first measure DC voltage with a DMM at the Flex's Powerpole connection. Record readings at several power levels all the way to 100W.
Provided the Pyramid 40A supply is regulating as designed, it should be more than adequate to power the Flex. I use a short run of #10 wiring from the supply's 1/4-inch terminal bolts to just one set of Powerpoles that connect to the Flex -- no other Powerpoles in the mix.
I had a very unsatisfactory result when using a PowerGate device and RigRunner DC power manifold. When using that arrangement as suggested by the manufacturer, a total of five (5) Powerpoles are used in the DC power path. In addition to loss, powering a transceiver through these devices can lead to a safety concern: If the path on the rig's negative lead opens for any reason, 20A of transceiver return current will find its way back to the power source through your accessory wiring as a negative lead substitute. These leads are not fused. This can cause negative leads on +12V accessories to burn and start a fire. At the very least, Powerpoles should be locked in tandem with roll pins (or similar locking mechanisms) to mitigate the effect of a missing negative return to a transceiver. The positive conductor should disconnect with the negative.
I now limit use of the RigRunner to only +12V, low-current accessory devices. Transceivers connect directly to a 30A power supply with no other connections or devices in between. This way, it's almost impossible for the negative lead to accidentally open between the Flex and supply.
Another thing to check is to make sure RF is not getting into the measurement. Place RF chokes on the power wiring and see if that makes a difference.
I'd like to share my experience and thanks to all you "Hams" and friends for help you gave me
This is what I read...and what I did
1st thing: "Definitely avoid switching supplies" ...my power supplies is linear, so I decided to check it exhaustively: 13.98 VDC 40 Amp after test ..so It is GOOD....so I took Howard (KY6LA) advise avoiding Switching Supplies
2nd thing: "I had a very unsatisfactory result when using a PowerGate device and RigRunner DC power manifold." Paul (W9AC) it was really a great advise, his experience with RigRunner made me think and check my RigRunner 4008H which was bought to keep "order" in my shack....however test showed me 0.4 voltage drop, 0.9 v after turning on Antenna Tuner ......so I took Paul advise using it only for low-current accessory device
3rd thing: "Do not use small cables" Howard(KY6LA).................... I took this advise seriously cause I didn't know what cable number came with my flex....after checked it I guess could be a #12 or #10 . I Decided to keep it cause It's the stock one, I'm sure Flex people wouldn't let themselves to have that kind of mistake...It must be right one.......
4nd thing: "No one has mentioned the cable between Flex and PS. An additional 15A can result in a several volt drop in wiring, connectors, and especially fuses" Stan (VA7NF) and "This is not the fault of the power supply its just what happens when you use a lot of current at a lot voltage" Delbert and " keep your cables as short as possible to reduce voltage drops" Howard (KY6LA)................I decided go directly from power supply 13.8VCD 40Amp to Flex with less than 2 meters #12 cable.......
Voila!!! Stand By DDutil screen shows 13.7 v......Its 0.3 v more than previously ....and shows 13.5 v during 15 watts power transmission.....against 11.7 v before apply change
Thanks a lot to all....you made me save 300 box ....next beers are on me
San Antonio, Venezuela
All you guys that say switching power supplies are OK, I challenge you to do the same test.
My power supply is an Astron 35A but after I purchased the Flex 6300 I also added a small
digital volt meter I picked up on eBay to monitor the voltage output like a 35M analog meter.
Hooked it to the output of the PS. This astron is almost 20 years old, many years ago I
mounted two small quiet muffin fans directly to the heat sink also powered from the output.
The PS runs VERY cool, I believe the pass transistors have lasted this long because of the fans.
I have an Astron 30S switcher on the shelf for a backup but fortunately have never needed it.
One other thing about the switcher supply I used when I built my Flex desktop computer.
At first I bought cheap from a local computer shop, BIG mistake, BIG Birdies EVERYWHERE!
Picked up a well filtered Corsair switcher supply, problem solved...
This conversation is no longer open for comments or replies.
This conversation is no longer open for comments or replies.