Using the same DC supply and watt meter my other rigs easily do 100 watts.
So am I the only one or have others noticed this?
I'm not interested in how small the DB difference is either. I just want to know.
I easily get 100W out of my 6700 but I use a 50A power supply and very short 8 gauge power cables.
Have you measured the voltage at the INPUT to your 6500 under transmit conditions.
I suspect that you have too low a supply voltage at the input and/or your voltage drop in your cables is causing your issue.
A = PowerMaster reading (set for full forward power reading),
B = Palstar HF-Auto power meter:
Band A B
-------- ----- ------
160m 98.3 90
80m 98.9 92
40m 95.0 89
30m 101 92
20m 97.7 92
17m 103 101
15m 88.6 87
12m 96.6 99
10m 92.3 89
6m n/a 104*
* probably inaccurate at this freq.
Hope this helps. My 6500 is almost exactly a year old.
seems odd, since the rd100's are good for 100 w a piece...and there's a pair, in push pull..
i know there's hardware rf negative feedback, but suspect the calibration routine..
I'd be a happy camper if mine put out 125 w easy, all bands..
It is hard to believe, but I will have had my 6700 for two years next month (probably means I will experience a non-warranty failure this summer). I noticed the low power output issue early on and it was cured by a short vacation in Austin for a re-calibration.
The length and gauge of the power cables are certainly important, but another factor to consider is the resistance of a PowerPole connector; it is even worse if you use some distribution system such as a RigRunner.
Have you double checked your power output with an external power meter? It could be the readings on the internal meter are software-driven and could be giving erroneous readings. Also, the tuner will exhibit some loss. Remember if you have an SWR that the power delivered by the source (transmitter) is the forward power minus the reflected power.
Early on with the Flex-6700 I found unexplained lower output times. The power supply "should" have not been the issue, as it was above spec and metering didn't indicate it as the issue.
Switching to a slightly larger power supply 100% corrected the issue. Suspicion centers on the apparently marginal power supply slightly dropping voltage - drooping if you prefer - at the key up moment, which the radio was sensitive to enough to limit output.
The oversized power supply corrected low output of the Flex-6700.
Mobile with the Flex-6300 I have used another oversized power supply with no noted issues.
accuracy...if calibrated from the factory...before i can say with some confidence of accuracy that
my Pout is low...don't have one in my shack...yet...
OTOH, i'm checking with a buddy for a simple, but reasonably accurate way to measure r.f. voltage around the 100 watt level...looks like 70.7 volts = 100w, to me..
As already mentioned, RF power output is very sensitive to DC supply voltage at the input terminals. If voltage sags to only about 12.8 volts, RF power out diminishes several watts, in some cases down to the high 80s. The spec in the ver. 1.4.0 Flex 6000 hardware Reference Manual states 100 watts CW out *at* 13.8 volts DC supply. If you don't measure 13.8 volts at the radio DC input terminals under load, it's not getting the specified voltage for full power RF output.
I run my supply at +14.5V using the Flex-supplied cable with Powepoles. This results in better than +14V at the Flex 6700. The power connection is fastened right on to the supply's 1/4-inch bolts. If a RigRunner or similar DC manifold is used to distribute +12V power through the shack, I strongly encourage folks to connect their transceivers direct to the power supply and not through the RigRunner.
Cascading Anderson Powerpoles can result in losses that quickly add up. When we're asking near 20A of current through them, even very small resistance affects voltage at the transceiver. I won't get into a philosophical diatribe about Powerpoles, but I do wish transceiver manufacturers would parallel these with a real power connector, like a pair of 1/4-inch bolts.
Next, when these power issues come up, it's important to measure power right at the output of the transceiver into a known 50-ohm load. When a wattmeter is inserted after filters and complex switch arrangements, one can easily see the accumulated loss through the coaxial distribution. That's what was happening here. I was seeing 85W after the switches and filters, but >95W at the output of the Flex 6700.
Any time a wattmeter's calibration is suspect, an easy way to verify the result is to measure RF voltage with a sufficiently-high-bandwidth oscilloscope at the 50-ohm load. Going one step further toward calibration, one can calibrate the scope against a known AC voltage.
Power output now at 95 watts max, any band. I also used a different, shorter coax jumper to the meter and dummy load.
I hated to shorten my cord. Now I need to order another one in case I want to relocate the rig.
So by increasing my voltage and shortening the cord I gained about 3 watts maybe. It's still low in my book.
BTW: Both my external watt-meter and the one in SmartSDR read nearly the same.....>Low
As for those Anderson Ppoles, I think they are dinky. The tiny strip of metal inside them seems inadequate ....What is the part number for those so I can order more?