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Re: Output power
Douglas Richards
I will
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Re: Output power
Let us know what was wrong with it, Dave On Fri, 14 Oct 2022, 18:20 Douglas Richards, <ve3ffr@...> wrote:
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Re: Output power
Douglas Richards
Thanks everyone.? I'm? just letting you know that I have decided to send the radio to a technician for possible repair.? Again thank you all for your help. 73 Douglas Richards VE3FFR?
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Re: Chinese FT-817 TCXO?
This morning a list member in a collins group I'm a member of apologetically offered a Collins 500 KC CW for $299 - he said he knew the price was outrageous, but that's what they fetch.
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He was right, he had a buyer within 10 minutes! Your comment made me think of it... Ken, N2VIP On Oct 14, 2022, at 03:15, Steve Sawicki via groups.io <ab2et@...> wrote: |
Re: Chinese FT-817 TCXO?
Do you have a schematic? On Fri, Oct 14, 2022 at 5:53 AM Brian Morrison <bdm@...> wrote: On Thu, 13 Oct 2022 08:43:40 -0700 --
Thanks, Chris Maness -Sent from my iPhone |
Re: Chinese FT-817 TCXO?
On Thu, 13 Oct 2022 08:43:40 -0700
"Petr Ourednik" <indians@...> wrote: The smaller TCXO case is latest actual version, the bigger oneIt's worth looking at the spec of the TCXO module, the TTS01NS part is intended to run from 3V but is 5V tolerant although with a significantly worse temperature coefficient. Whatever the new part is may be similar. I modified my TTS01NS based older TCXO-9 with a 3V SOT-23 low noise LDO regulator with several extra decoupling caps fitted too. It is back to better stability with this mod. -- Brian Morrison G8SEZ |
Re: Output power
What frq on RX And then by TX? Maybe split mode and second vfo out od ham band. 73 Alex OK4AS? Dne p¨¢ 14. 10. 2022 1:52 u?ivatel Douglas Richards <ve3ffr@...> napsal:
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Re: Output power
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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Re: Output power
¿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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Re: Output power
¿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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Re: Chinese FT-817 TCXO?
Good Morning Petr,
Yes the Internet is? very wide and deep If you do Find the Information Please Post, I Have tried different variations so far No Luck. So Far In All Of My Years of? FT-817's Operations I have Not Noticed " phase noise" problem. Did Notice what may be interpreted as " phase noise"? when USERS where using? Switching? PSU "Bricks and even "Fancy" Switching Power Supplies that? where curable? that had "noise offset" adjustment capabilities The "Bricks" even the best still had what som with ( 20 year old hearing) abilities, Hi Hi may call " phase noise" . The Funny Part? that I noticed, that in some recent Florida Hamfests You can pick up a FT-817 for the Asking "Cost" of a Collins CW Filter. Best Regar Steve AB2ET/4 |
Re: Output power
Douglas Richards
Ok, I just tested use CW.? Display screen says TX err 73 Douglas? Try testing HF using CW and let us know. |
Re: Output power
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. |
Re: Output power
Douglas Richards
On hf I was using lsb, vhf/uhf, I was using fm. Douglas?
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Re: Output power
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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Re: Output power
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.) |