The Defpom Forum, for RadioMods, S&M Software and Music by The Defpom

on the new cobra 25 ltd/nw. i have done several 2030 mods.. 5w carrier peaking roughly 20 watt swing. not pep but 100% mod/vr cranked.. so im not sure on what pep would be.. if i was to use the rfx bolt on unit what would i expect to see????? is it better ? more wattage? i just ask cause for 10$ in ekl parts i can do not to bad... if i use the 35$ rfx.. will i see more on a NEW cobra 25?? please any help is a bonus as why spend$$$$$ if you dont have to.. thank you

The RFX75 is well worth the $35 to $40 for the power that you will get!!
I have one that i installed in my Galaxy DX 959 and its doing 2~10w carrier 100 watt swing +or- 5w... this is high from what i have seen from the RFX75 box avg is 50 to 75 but it depends on what radio its going in that will determine the swing
The Meter i use is a Workmen HP201S
for the Cobra 25 hear is the install for the RFX75
http://cbtricks.com/miscellaneous/acces ... bra_25.pdf

just a side note you will need to change the inline fuse from a 3 Amps to a 7 Amps min.
The power cord may need to be upgraded as well to a 16 gauge or better.
My DX 959 is pulling 3 Amps with a 2w carrier and just over 5 1/2 Amps with a 10w carrier when i give it AUDIO on AM it pulls 7 Amps and on SSB it pulling 14 Amps

PS: paying $10 bucks for them EKL parts is not worth it.. get more power with the IRF520 chip.
do the mod as if you where using the erf2030 and EKL EN-1230 but sub the erf2030 for an IRF520 and the EKL EN-1230 for a home brewed one.
This will drop the cost and up the power a bit.
hear is a pic of the inner workings of a EKL EN-1230 to build a home brewed One

where to get the parts well i use radio shack.
D1 = 1N4148 1x 10 pack radio shack Catalog #: 276-1122 1x=$1.49
R1 = 470 Ohm 2x 5 pack radio shack Catalog #: 271-1317 2x=$1.98
R2 = 3.3K Ohm 2x 5 pack radio shack Catalog #: 271-1328 2x=$1.98

The Cost for 10x IRF520 off E-bay is $15 after S&H
I pay $1.50 per IRF520 and $0.55 for the home brewed EKL EN-1230
That is $7.95 cheaper than what you are paying but i buy in bulk to do 10 radios and i don't bother with the 68PF cap..
so in all without the 68PF cap it cost $20.45 to do up 10 Radios..

If you cant get a install for the RFX75 for a Radio that you may have let me know and ill see what i can do to help.

Hope that helps 617 North East Corner Boston just gut down and i am back quiet

thank you for the info.. ive heard mixed reviews on the ir vs. erf some say more pwr like you an others say they r tha same ? i never used a ir520 yet but will give it a try to compare on a new 25ltd side by side with a en2030 in another to see if i get a diff on my bird43. as for your home brew en1230.. how do you think you see a pwr gain if using the same components? or is it just due to size/home made being lager an therefore internal heat mostely the factor in the 1230?? thanks again for the info and helpful tips

no12nv wrote:... i never used a ir520 yet but will give it a try to compare on a new 25ltd side by side with a en2030 ...

Hello,
the IRF520 run very well. And they are very inexpensive.
I have tested them in my Grand.
SSB 38-42 watt max., adj. on approx. 25-30 watt
AM 8 watts death key
FM approx.18 watts (with a small trick)