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FT847 calibrate the V / U frequency

#tip

Frank All Messages By This Member #326 HI all With the FT847 in VHF and UHF I have verified that they are off frequency of + 250Hz. Does anyone know where in the radio I find and how can I correctly calibrate the right frequency? 73
Omni All Messages By This Member #327 开云体育 Your FT-847 is actually in spec.? Per the manual the frequency accuracy for the 847 is at best 2 PPM.? That translates to +/- 870 Hz at the center of the 70cm band, which is 435 MHz.? ?If you want to try and reduce the frequency error you will have to adjust the Reference Oscillator, which will take a very accurate frequency counter that can resolve down to 1 Hz at the reference frequency of 45.250 MHz.? An alternate method would be to Zero Beat the Reference Oscillator against WWV, but that might be a little less accurate. ? ? toggle quoted message Show quoted text From: [email protected] [mailto:[email protected]] On Behalf Of Frank Sent: Saturday, January 22, 2022 4:57 AM To: [email protected] Subject: [YaesuFT847] FT847 calibrate the V / U frequency #tip ? HI all With the FT847 in VHF and UHF I have verified that they are off frequency of + 250Hz. Does anyone know where in the radio I find and how can I correctly calibrate the right frequency? 73
Micky Corrow All Messages By This Member #328 开云体育 I am also interested in a solution to this. Mine is off +200 or so Micky K1XH ? toggle quoted message Show quoted text On 2022-01-22 04:56 AM, Frank wrote: HI all With the FT847 in VHF and UHF I have verified that they are off frequency of + 250Hz. Does anyone know where in the radio I find and how can I correctly calibrate the right frequency? 73
Micky Corrow All Messages By This Member #329 开云体育 Is the adjustment procedure detailed in the Technical Reference (Service Manual)? Micky K1XH ? toggle quoted message Show quoted text On 2022-01-22 11:42 AM, Omni wrote: Your FT-847 is actually in spec.? Per the manual the frequency accuracy for the 847 is at best 2 PPM.? That translates to +/- 870 Hz at the center of the 70cm band, which is 435 MHz.? ?If you want to try and reduce the frequency error you will have to adjust the Reference Oscillator, which will take a very accurate frequency counter that can resolve down to 1 Hz at the reference frequency of 45.250 MHz.? An alternate method would be to Zero Beat the Reference Oscillator against WWV, but that might be a little less accurate. ? ? From: [email protected] [mailto:[email protected]] On Behalf Of Frank Sent: Saturday, January 22, 2022 4:57 AM To: [email protected] Subject: [YaesuFT847] FT847 calibrate the V / U frequency #tip ? HI all With the FT847 in VHF and UHF I have verified that they are off frequency of + 250Hz. Does anyone know where in the radio I find and how can I correctly calibrate the right frequency? 73 ?
Omni All Messages By This Member #330 开云体育 Yes, of course it is. ? The adjustment is very touchy and if you are not careful or you will make things worse. ? ? toggle quoted message Show quoted text From: [email protected] [mailto:[email protected]] On Behalf Of Micky Corrow Sent: Saturday, January 22, 2022 12:08 PM To: [email protected] Subject: Re: [YaesuFT847] FT847 calibrate the V / U frequency #tip ? Is the adjustment procedure detailed in the Technical Reference (Service Manual)? Micky K1XH ?
Frank All Messages By This Member #331 Edited Yes 250Hz are few but still too many ... Has anyone used the system described here or knows if it can produce problems, if there are other solutions or if this is the solution? ? It doesn't seem that complicated with the right gear. I have read about this solution on several sites, but before doing so I ask for more information. 73
Frank All Messages By This Member #332 Has anyone tried the "simple" tips of the TC1001 described? Any other method? 73
K6EU All Messages By This Member #335 Hi Frank I used the TC1001 adjustment several years ago.? No big deal once you find TC1001.? I my case I was off about 1700 hz on 432.? Got it alot close but without the dropper test equipment, can't say exactly. Couple of hints.? Make sure the Ft847 is fully warned up as there is a slight drift from a cold start.? Can't remember exactly where the TC control is located but remember you remove the bottom cover to access.? Think it near the front, but not sure.? 73, Tom K6EU toggle quoted message Show quoted text On Sun, Jan 30, 2022 at 1:41 PM Frank <hb9oab@...> wrote: Has anyone tried the "simple" tips of the TC1001 described? Any other method? 73

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