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Message |
    
Limacharly6
Junior Member
Username: Limacharly6
Post Number: 14
Registered: 1-2004
| | Posted on Sunday, October 28, 2007 - 9:40 pm: | 
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still nothing else on it other than the mod list you have here. my main concern is locating the carrier insertion, although it has AM power im curious if the carrier deviation you have listed adjusts the frequency of the carrier or the amount. any info? |
Tech808
Moderator
Username: Tech808
Post Number: 14597
Registered: 8-2002
| | Posted on Sunday, October 28, 2007 - 10:13 pm: |
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Limacharly6,
If you are talking about the TEK HR-3950 10MTR Mobile Radio all of the information that I have on it is posted in the Modification List.
Lon ~ Tech808 ~ N9CEF
CEF#808 ~ CEF HAM#33 ~ CVC#002
Tech808@copperelectronics.com
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Limacharly6
Junior Member
Username: Limacharly6
Post Number: 15
Registered: 1-2004
| | Posted on Monday, October 29, 2007 - 10:53 pm: |
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oh i understand that, what i meant to ask is if the carrier balance you have listed adjusts the carrier amount, or the frequency that the carrier transmits. because i dont currently have a frequency counter to put it back on if it moves it over.
but if it does adjust the carrier insertion i could use it to make a variable deadkey, then turn the am power up from where it sits now :o. help D: |
Tech858
Moderator
Username: Tech858
Post Number: 21
Registered: 10-2007
| | Posted on Tuesday, October 30, 2007 - 7:13 am: |
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Limacharly6
The carrier balance has nothing to do with the amount of deadkey you will get as far as I can recollect it is for adjusting the tx carrier center freq , if you want adjustable AM deadkey you will have to remove the variable for the AM power and run wires to a pot of the SAME value as the one you removed on the front or where ever you decide to put it , just remember to use solid cored wire instead of stranded wire as the stranded has got some resistance and might alter things a bit . 
Tech858/Jim
MM0TXO
CEF#858
HAM#230
CVC#116
Wavin' a hand at ya' fae Scotland 
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Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2623
Registered: 9-2004
| | Posted on Tuesday, October 30, 2007 - 9:25 pm: |
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the carrier balance adjustment nulls the carrier on SSB modes.
you adjust it by turning your mic gain all the way down, putting the radio in SSB mode, setting the wattmeter on its lowest scale, and keying the mic.
look closely at the wattmeter for any jumps when the mic is keyed.
you may see a very slight jump when the mic is keyed, but it should immediately return to resting after that.
if you see any deadkey wattage on SSB (LSB or USB) you would adjust the carrier balance control so that deadkey wattage disappears.
usually this adjustment never needs tuning unless mods or repairs have been done to the clarifier circuit, and usually not even then.
99% of the time, if this pot needs adjusting, its because someone turned it not knowing what it did.
good luck,
matt
anyone wanting a "clean signal", just look to the left and build one of these!!!
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Captian_radio
Intermediate Member
Username: Captian_radio
Post Number: 257
Registered: 9-2004
| | Posted on Wednesday, October 31, 2007 - 8:46 am: |
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Another way to adjust the carrier balance is to use an swr meter,put the meter in the forward position and set it to maximum, key the mic with no audio and make your adjustment,I have been doing it this way for years and works better, as the swr meter in forward is much more sensitive than a watt meter for adjusting the carrier null.As Kid stated the null does not usually cause any problems unless it's been messed with
Bob CEF451/VE1CZ
Robert L. Spicer The days of radio are just beginning!
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Tech858
Moderator
Username: Tech858
Post Number: 22
Registered: 10-2007
| | Posted on Wednesday, October 31, 2007 - 1:22 pm: |
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Thanks for jogging my memory guys , as Kid says there should be no dead-key wattage on the meter but remember if you are going to check this to make sure that you check it on both USB and LSB modes as it might show no reading on USB but will show a reading on LSB as it is for balancing the sideband suppression between usb and lsb .
Tech858/Jim
MM0TXO
CEF#858
HAM#230
CVC#116
Wavin' a hand at ya' fae Scotland
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Kid_vicious
Senior Member
Username: Kid_vicious
Post Number: 2624
Registered: 9-2004
| | Posted on Wednesday, October 31, 2007 - 11:45 pm: |
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good idea bob!
i will try this next alignment i do.
thanks,
matt
anyone wanting a "clean signal", just look to the left and build one of these!!!
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