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Power Output
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Elliott
I recently purchased an FT-817 and am getting familiar with all the features and getting the feel with my oversized fingers!
I have worked some station on cw and ssb from home and the signal/quality reports are fine. I decided to do some checks on the radio with respect to the output power. The external power source was 13.6 volts and at key down it dropped to about 13.1 volts. The antenna was matched to a VSWR of 1:1 and I also used a 50 ohm resistive dummy load. I used 2 independent QRP power meters that gave essentially the same results. At maximum selected power the output was ~4.5 watts 1.8-7.0 mhz and ~4.0 watts 10-28 mhz. I have not checked 6 meters, 2m/440. The power output in the 3 lower power settings was proportionally lower, about 20%. Has anyone else experience these type of readings? How easy is it to adjust the power out level? Since it is present at all power settings I would assume their is one adjustment to take care of all 4 levels? TIA es 72 Elliott WA6TLA |
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Elliott
Thanks Dave but the power output was down immediately after I turned the radio on. So...duty cycle/heating is not the problem.
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Elliott Wa6TLA David Henn wrote: --- In FT817@y..., Elliott <edl@p...> wrote:proportionally lower, about 20%.Hello Elliott, |
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Fred Winter
--- In FT817@y..., Elliott <edl@p...> wrote:
~4.0 watts 10-28 mhz. I have not checked 6 meters, 2m/440. The power output in the 3 lower power settings was proportionally lower, about 20%. I get exactly the same readings on my Oak Hills WM-2 QRP wattmeter... Fred KD7T |
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--- In FT817@y..., Elliott <edl@p...> wrote:
Thanks Dave but the power output was down immediately after Iturned the radio on. So...duty cycle/heating is not the problem. Hello Elliott, Sounds like it could be just an adjustment. I think the spec calls for 5.0 +/- 0.1W. I'm not sure on your test gear setup.. But there are are adjustments that can be done in a Svc mode. You can get a svc manual from Yaesu at (562)404-2700 Extn: 351 - Parts, Extn: 242 - Tech Support. Rgds - David |
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Elliott Lawrence
Yes....I am also using the WM-2 QRP watt meter and compared it to the watt meter in the MFJ-971 set for QRP. Identical readings.
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Looks like Yaesu sets em on the low side.....assuming that it can be made higher. I realize that the difference is only ~1 db but it would be nice if the radio met the advertised specs. Elliott WA6TLA Fred Winter wrote: --- In FT817@y..., Elliott <edl@p...> wrote:~4.0 watts 10-28 mhz. I have not checked 6 meters, 2m/440. The |
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Elliott Lawrence
Dave:
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Thanks for the info. I just ordered the manual and some DIN connectors. Apparently Yaesu is coming out with a service manual update as they have assigned a new part number. Unfortunately they are not yet in stock and could be a while in arriving. So...I decided to order what was available. 72 Elliott WA6TLA David Henn wrote: --- In FT817@y..., Elliott <edl@p...> wrote:Thanks Dave but the power output was down immediately after Iturned the radio on. So...duty cycle/heating is not the problem.Hello Elliott, |
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Julio
Fred how do you like the Oak Hills WM-2? Did you get yours as a kit, and does it calibrate easily. I just finished building the Z11 tuner and this is next on my list of projects.
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73's Julio ----- Original Message -----
From: Fred Winter To: FT817@... Sent: Wednesday, June 13, 2001 5:03 PM Subject: [FT817] Re: Power Output --- In FT817@y..., Elliott <edl@p...> wrote: > > At maximum selected power the output was ~4.5 watts 1.8-7.0 mhz and ~4.0 watts 10-28 mhz. I have not checked 6 meters, 2m/440. The power output in the 3 lower power settings was > proportionally lower, about 20%. > > > TIA es 72 > Elliott WA6TLA I get exactly the same readings on my Oak Hills WM-2 QRP wattmeter... Fred KD7T Yahoo! Groups Sponsor Yahoo! Website Services- Click Here! To unsubscribe from this group, send an email to: FT817-unsubscribe@... and for a great FAQ ( Frequently Asked Questions ) see Please note that your messages and files sent to this group become public domain upon submission and may appear anywhere on the Internet or in print without notice or compensation. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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Fred Winter
--- In FT817@y..., "Julio" <WB4OOJ@A...> wrote:
Fred how do you like the Oak Hills WM-2? Did you get yours as akit, and does it calibrate easily. I just finished building the Z11 tuner and this is next on my list of projects. and ~4.0 watts 10-28 mhz. I have not checked 6 meters, 2m/440. Thewattmeter... I bought my used & already assembled. It is *very* easy to calibrate. Has a calibration procedure/capabailaity built into the unit. You adjust a pot for a specified voltage & three more pots for a fixed output reading. Very easy...takes about two minutes. The unit is well designed and appears to be quite accurate on all three reading scales. (10W, 1W, 100mW) The LDG digital wattmeter looks interesting also! I have yet to try one, but am considering purchasing one. Fred KD7T |
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Julio
Thanks for the reply Fred. I've also looked at the LDG meter, looks like I'm 2 meters behind you HI HI.
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----- Original Message -----
From: Fred Winter To: FT817@... Sent: Wednesday, June 13, 2001 8:46 PM Subject: [FT817] Re: Power Output --- In FT817@y..., "Julio" <WB4OOJ@A...> wrote: > Fred how do you like the Oak Hills WM-2? Did you get yours as a kit, and does it calibrate easily. I just finished building the Z11 tuner and this is next on my list of projects. > > 73's Julio > ----- Original Message ----- > From: Fred Winter > To: FT817@y... > Sent: Wednesday, June 13, 2001 5:03 PM > Subject: [FT817] Re: Power Output > > > --- In FT817@y..., Elliott <edl@p...> wrote: > > > > > At maximum selected power the output was ~4.5 watts 1.8-7.0 mhz and > ~4.0 watts 10-28 mhz. I have not checked 6 meters, 2m/440. The > power output in the 3 lower power settings was > > proportionally lower, about 20%. > > > > > > > TIA es 72 > > Elliott WA6TLA > > I get exactly the same readings on my Oak Hills WM-2 QRP wattmeter... > > Fred KD7T > I bought my used & already assembled. It is *very* easy to calibrate. Has a calibration procedure/capabailaity built into the unit. You adjust a pot for a specified voltage & three more pots for a fixed output reading. Very easy...takes about two minutes. The unit is well designed and appears to be quite accurate on all three reading scales. (10W, 1W, 100mW) The LDG digital wattmeter looks interesting also! I have yet to try one, but am considering purchasing one. Fred KD7T Yahoo! Groups Sponsor To unsubscribe from this group, send an email to: FT817-unsubscribe@... and for a great FAQ ( Frequently Asked Questions ) see Please note that your messages and files sent to this group become public domain upon submission and may appear anywhere on the Internet or in print without notice or compensation. Your use of Yahoo! Groups is subject to the Yahoo! Terms of Service. |
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