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Output power
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Douglas Richards
Afternoon? Name here is Douglas Richards VE3FFR? I just recently purchased my Ft-817, and after charging the battery I was able to test the output? power.? Vhf approximately 5-6 watts Uhf approximately 3-4 watts Hf and 6m, non existence. According to my serial number? research,? my rig was made in 2000, September, lot 81 and the 0028 unit made.? Any suggestions? greatly appreciated.? Thank you 73 Douglas Richards VE3FFR? ve3ffr@...? |
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Douglas Richards
All antennas are on the rear. Douglas? You might want to check the antenna selection for HF, it can be selected either for front ant or rear ant, if your using the wrong one you wont get any output as the radio will fold back power. |
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Hi I would say you need a new final unit, when this happens with output on VHF and UHF , it is only one of the tranny's is dead , but it is easier to change the final unit, Dave 2E0DMB On Thu, 13 Oct 2022, 22:17 Douglas Richards, <ve3ffr@...> wrote:
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Douglas Richards
Thank you Should I? upgrade to the newer version? My model is 22 years old.? Douglas?
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Yes I would, that is probably the only one you can get now, get direct from yaesu On Thu, 13 Oct 2022, 22:46 Douglas Richards, <ve3ffr@...> wrote:
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You should get one in your country, no need to get one from Germany, Dave On Thu, 13 Oct 2022, 22:49 Petr Ourednik, <indians@...> wrote:
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Very cheap fix if DIY, Dave On Thu, 13 Oct 2022, 22:03 Douglas Richards, <ve3ffr@...> wrote:
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FT817 uses the same TX power train for all bands (unlike '857 and most other all-band radios)
If you have zero power on some band it is very unlikely to be any of the transistors. Look at the block diagram (pg 5 of service manual) - Relay RL3017 is the HF/ VU filter switch. - there are pin diode switches on the IF board that select HF filter bank - there are control signals in the front panel flex that could interfere with the switching - There are eeprom settings for each band that might be able to turn the power off - front rear antenna relay as already mentioned - an RX noise check should let you know that it really is working the way you think it is for those bands. Measuring the DC current on AM TX might tell you if the finals are running but there is a break after them (e.g. RL3017). (There are mini-jumpers for the driver and final transistors VDD, so it is also quite easy to check actual final current.) |
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Make sure you are using the correct antenna connector, front or rear.? Will have "R" on display if rear. The connector can be selected in menu for different bands. There is only one PA for all the bands so if working on one band should be on all. Be careful with the PA.? The rig has little to no protection so if using the wrong connector or bad load it can damage the PA if in TX for long period. One other note, what mode you using for your test???
On Thursday, October 13, 2022 at 05:57:07 PM EDT, davebb123456 <davidbrowne76@...> wrote:
Very cheap fix if DIY, Dave On Thu, 13 Oct 2022, 22:03 Douglas Richards, <ve3ffr@...> wrote:
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Douglas Richards
On hf I was using lsb, vhf/uhf, I was using fm. Douglas?
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Douglas Richards
According to the switch on the Rtsystems? software, vhf and uhf are on the rear. Douglas? Sorry, but there is a BNC ANTENNA PORT on the front, mainly for UHF & VHF. |
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Douglas Richards
Ok, I just tested use CW.? Display screen says TX err 73 Douglas? Try testing HF using CW and let us know. |
¿ªÔÆÌåÓýYou need to use FM on HF/6 as well to get a carrier to measure. ? 73¡.Eric VK2VE. ? From: [email protected] <[email protected]> On Behalf Of Douglas Richards
Sent: Friday, 14 October 2022 09:26 To: ft817 <[email protected]> Subject: Re: [ft817] Output power ? On hf I was using lsb, vhf/uhf, I was using fm. Douglas? ? ?
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¿ªÔÆÌåÓýHi Douglas, ? The antenna port can be selected for each band individually. ? An ¡®R¡¯ will be on the screen next to the Frequency when the rear connector is selected. No R = Front (BNC) connector. ? The default is HF/6 on rear, VHF/UHF on front. ? 73¡.Eric VK2VE. ? From: [email protected] <[email protected]> On Behalf Of Douglas Richards
Sent: Friday, 14 October 2022 09:31 To: ft817 <[email protected]> Subject: Re: [ft817] Output power ? According to the switch on the Rtsystems? software, vhf and uhf are on the rear. Douglas? ? ?
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SSB does not generate a carrier when the PTT is pressed.? You need audio to cause an actual signal to be generated.? Use CW and a key. Take care, Mark AA3K
On Friday, October 14, 2022 at 07:34:56 AM EDT, Eric van de Weyer <groups.io@...> wrote:
You need to use FM on HF/6 as well to get a carrier to measure. ? 73¡.Eric VK2VE. ? From: [email protected] <[email protected]> On Behalf Of Douglas Richards
Sent: Friday, 14 October 2022 09:26 To: ft817 <[email protected]> Subject: Re: [ft817] Output power ? On hf I was using lsb, vhf/uhf, I was using fm. Douglas? ? ?
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Michael Newbury SA4MDN
Clyde Lambert