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cobra 29 final
- Thread starter Number15
- Start date
lords
Active Member
lords
Active Member
#15 ? To get more rather then to waste your time with "just" a 1969 change over in your 29 , You would also need to change the driver to a 2314 . There's also a few other things you can do as well . But just changing the final won't really help you very much it would be more of a waste of time then not unless you at least change the driver as well . That's power in perspective.
lords said:
A 2078 is only 4 watts?
A 1969 is only 16-18w?
I think one of use needs our meters checked.
Even a stock 29 with a 2078 should be able to do 16w at 100% modulation.
Just swapping out the final for a 1969 will yield stronger modulation. The key-to-peak ratio will increase while still keeping the audio clear. If you take the time to make a few other part changes (I personally don't bother changing the driver), you will get lots of extra PEP. The ERF2030 is also a great final. It is my final of choice for that type of radio. Follow CB Trick's procedure and you will get good results.
Switch Kit said:
How ya doing Switch?
I just wanted to jump and back your point about changing the driver.... it makes a big difference in peak output.
But.... one thing I have been noticing in alot of the newer cobra 29's I've been doing is the majority of them already have a 2314 driver in them.
It seems that Cobra has changed from the 1957 to 2314 in alot of the newer radios they have been putting out. I've noticed this difference right around the time the Dale Ernahrdt model cobra 29's started to come out. Alot of cobra 29's put out after a certain date all have 2314 drivers in them.
Which date it was i started seeing this I can't remember.... but I do remember I started seeing alot of 29's with 2314's in them when the Dale Ernhart model hit the market.
Its very uncommon for me to have to change a driver in a new Cobra 29 anymore... the majority of the new 29's I've been doing already have the 2314 driver in them.
Check the driver before you remove it.... theres a possiblity that it could already have a 2314 in it.
Take care
Number15 said:
Personally, I don't care for the 2030 in a radio that will not be used to drive an amp (barefoot). If your not going to use an amp, you might be better off with a 1969.
When you peak up a radio that will not be used with an amp you want a good amount of carrier power with enough peak power so your modulation is at the 100% mark most of the time.
When you increase your output power you want to increase the carrier (deadkey) and swing at the same time. Increasing just your swing (peak wattage) will make you sound loud and distorted once you go past a certain point.
The advatage to the 1969 transistor is you can achieve high swing of 30 watts or more BUT you can get more carrier power easier than with a 2030. With a 1969 transistor 8 watts carrier swinging to 30 watts is possible. Its a really good mix of swing and carrier power for loud audio but also higher carrier power to give more range..... swing makes you loud (to a point) and carrier (deadkey) gives you range.
With a 2030 mod, the result is usually a carrier of around 4 watts (give or take) and peak swing of 40 watts (again, give or take). You definatly get more swing out of it but you sacrifice range with the lower carrier. To raise the carrier on a 2030 is ALOT harder than it is with a 1969.
To make a cb transmit further... you want a good amount of carrier power that will give you range and get that signal out far..... you also want a decent amount of modulation so your signal is as loud is it can be without distortion hampering understandabilty.
My only problem with the 2030 is when its used in a radio thats not used with an amp. Its harder to get decent carrier power (deakey) with a 2030 than it is with a 1969....
You can use either the 2030 or 1969.. its up to you.... but I still favor a 1969 transistor in a radio that not going to be used with an amp
With this question in an earlier post, my washington has no power to the dosy meter thru the antenna connector, but it does show modulation on the radio's meter. Guessing the 1969 is blown.So can the 2078 final be used in this radio?
you could make the 2078 work i'd bet, but its not as simple as just dropping it in place of the 1969.
the washington is a SSB radio which means the final and driver are biased for use with SSB.
because of the extra circuitry, your washington will be more "finicky" about what final you put in it.
best to use a 2SC1969 or 2SC2132 if you can find them. (real ones, not the fakes sold on ebay)
if not, use a MOSFET IRF520.
you will need to change some parts, but it can be made to work.
there is a guy on this forum who calls himself exitthirteen, and he wrote up a procedure for doing this to your type of radio.
you will have to search the forum to find it though.
LC
the washington is a SSB radio which means the final and driver are biased for use with SSB.
because of the extra circuitry, your washington will be more "finicky" about what final you put in it.
best to use a 2SC1969 or 2SC2132 if you can find them. (real ones, not the fakes sold on ebay)
if not, use a MOSFET IRF520.
you will need to change some parts, but it can be made to work.
there is a guy on this forum who calls himself exitthirteen, and he wrote up a procedure for doing this to your type of radio.
you will have to search the forum to find it though.
LC