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 crt 6900n bad tx audio

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rabbi
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Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 128
Times Thanked : 2
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 63

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PostSubject: crt 6900n bad tx audio   crt 6900n bad tx audio Icon_minitimeWed May 19, 2021 9:12 pm

hi i have a new crt 6900n i bought it a few years ago 10 meters now open i had difficulty getting a contact i worked a dl station who told me my audio was very bad i tryed the menu settings still distorted audio on all phone modes i bought it from knights a few years ago and it had a fualt so sent it back it cost me 20 quid so when it came back it was on 27mhz after a phone call and a look around sites i got the key in details on the key pad i thought ok not used so i fired it up last week distorted audio any ideas so my ts 2000x in line now no probs thanks for looking stay safe get on 28mhz 73s paul m0kbd

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Northern Crusader
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Call Sign : M0GVZ / 26CT1760
Posts : 481
Times Thanked : 32
Join date : 2019-11-13
QTH or Location : IO94SA
Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike
Age : 52

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PostSubject: Re: crt 6900n bad tx audio   crt 6900n bad tx audio Icon_minitimeThu May 20, 2021 2:12 am

Overdriven mic gain or you've got common mode RFI on the coax due to a lack of decent RF ground at the antenna and any RF choking on the coax going to it.

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SangueG
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SangueG


Call Sign : 26-CT-3971 / M7TDV
Posts : 735
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Join date : 2021-01-30
QTH or Location : Cirencester, Gloucestershire
Equipment Used : Little radios, home-made antennas

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PostSubject: Re: crt 6900n bad tx audio   crt 6900n bad tx audio Icon_minitimeThu May 20, 2021 7:30 am

Did the station describe your audio, e.g. did it warble, or was it muffled etc? As well as the above suggestions, could be the PSU. If not enough power to drive it audio can warble.

What mic using? I know many people swap out the stock mic as it does seem a bit of a cheap afterthought by the manufacturer. I still use the stock one mostly, and whilst it's no studio mic, it's doing the job with no complaints. Have removed the foam insert, set the mic gain to 57, and talk a couple of inches from it.

Depending on the radio version you can set the talk back to to listen your mic. Not written in all versions of the manuals.. Long press on the function button then short presses of it until you see 'n09', use channel knob to adjust the talkback volume between 'off' and volume '63'. Hope that helps.

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Alan Pilot
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Call Sign : 163-CT-220...MW7TTA
Posts : 1951
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QTH or Location : Anglesey North Wales
Equipment Used : Yaesu FT-991A,,Yaesu FTDX-10,,Icom ic-7300,,Anytone AT-D878UV PLUS",,LINCOLN II+.
Age : 149

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PostSubject: Re: crt 6900n bad tx audio   crt 6900n bad tx audio Icon_minitimeThu May 20, 2021 8:17 am

Sure this has been covered a few times but not under "HF Radios 0-30MHz" over in the "Multimode, Export and Sideband Radio" section.

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rabbi
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Call Sign : m3kbd/2e0kbd/m0kbd
Posts : 128
Times Thanked : 2
Join date : 2019-07-04
QTH or Location : stockton on tees
Equipment Used : kenwood ts 2000x ascom 70mhz icom vlf/hf/uhf receivers multiband antennas
Age : 63

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PostSubject: crt 6900n    crt 6900n bad tx audio Icon_minitimeThu May 20, 2021 8:45 am

hi thanks lads for your reply i will do a through cheek out on all aspects of this crt 6900n 28mhz rig as you say it must be the mic the other kpo mic i bought from knights is not a power mic i will test it fully today when i think back to cb days the turner expander wow was that loud and some folk used them with a mellos echo box stay safe get on 10 meters whill it is still open paul m0kbd 73s

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