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by fat boy
Sunday, 06 March 2016, 20:18 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: 1446 watts
Replies: 2
Views: 322

1446 watts

How many watts are 4 1446s supposed to put out with 20 watt drive
by fat boy
Sunday, 01 February 2015, 9:45 AM
Forum: RADIO MODIFICATIONS
Topic: Cobra 2000 direct injection problem
Replies: 14
Views: 1770

Re: Cobra 2000 direct injection problem

Where would i inject the audio in order to make it work on ssb

by fat boy
Tuesday, 30 December 2014, 10:41 AM
Forum: GENERAL QUESTIONS
Topic: hr2510 repair
Replies: 12
Views: 656

Re: hr2510 repair

My local guy fixed it hes one of the best techs around. Dave frasier is his name he doesnt do much anymore but he is the best i know. He put a brand new 477 in it amd there was an ic that was blown and he fixed that it does 45 watts and has awesome audio
by fat boy
Saturday, 22 November 2014, 13:02 PM
Forum: GENERAL QUESTIONS
Topic: hr2510 repair
Replies: 12
Views: 656

hr2510 repair

Does anyone know any that repairs messed up hr2510s the radio i have has excellent recieve but 0 transmitt in any mode
by fat boy
Wednesday, 29 October 2014, 8:32 AM
Forum: RADIO MODIFICATIONS
Topic: Cobra 2000 GTL
Replies: 11
Views: 532

Re: Cobra 2000 GTL

Hey cb doctor can you draw me a schematic to use to install the switched crystal mod and does the radio need realignment after doing the switched crystal mod?
by fat boy
Tuesday, 28 October 2014, 19:51 PM
Forum: RADIO MODIFICATIONS
Topic: cobra 148 channel mod
Replies: 1
Views: 197

cobra 148 channel mod

Can anyone tell me how to do the switched crystal mod ona cobra 148 to give me 40 channels up
by fat boy
Monday, 27 October 2014, 6:32 AM
Forum: ANTENNA HELP
Topic: High SWR with the juice
Replies: 14
Views: 678

Re: High SWR with the juice

Im glad you figured it out brother maybe you do have a clean station but i have seen harmonics show a false high swr reading
by fat boy
Sunday, 26 October 2014, 14:34 PM
Forum: ANTENNA HELP
Topic: High SWR with the juice
Replies: 14
Views: 678

Re: High SWR with the juice

Hey if you still have this problem after you fix your coax. Then you are producing harmonics with your amp on that will give you a false reading that saturn is more than likely the culprit of the harmonic . You wont notice it at barefoot level but when you hit the power it magnifies the harmonics re...
by fat boy
Thursday, 23 October 2014, 16:36 PM
Forum: COMPETITION RIGS
Topic: need help with 2 antenna system
Replies: 2
Views: 878

need help with 2 antenna system

I need measurements for a 2 antenna bounceback system using a 106 inch whip as a hot. This is a 2014 ram 2500 with a service body the whip is mounted evem with the box tops
by fat boy
Tuesday, 21 October 2014, 15:02 PM
Forum: ANTENNA HELP
Topic: SWR problem. Im lost...
Replies: 30
Views: 868

Re: SWR problem. Im lost...

Hey post a pic of you setup 102s usually work really well on pickups as long as your coax is good usually you will get below a 2 swr on it which is ok to run just about anything as long as you dont go any bigger than a 4 pill
by fat boy
Monday, 20 October 2014, 11:13 AM
Forum: OTHER TECHNICAL QUESTIONS
Topic: magnum 257hp trouble
Replies: 2
Views: 227

Re: magnum 257hp trouble

Well im using it in the mobile on my magnet mount if i use a bird meter inline it works fine if i put any other wattmeter inline the radio goes stupid and transmits a fuzzy signal on ssb and swings backward on am unless i put my hand on the radio or coax shield its a strange problem that i cant figu...
by fat boy
Saturday, 18 October 2014, 18:14 PM
Forum: OTHER TECHNICAL QUESTIONS
Topic: magnum 257hp trouble
Replies: 2
Views: 227

magnum 257hp trouble

Has anyone ever had any trouble with having a wattmeter or amp inline behind a magnum 257hp on a magnet mount tram antenna
by fat boy
Sunday, 12 October 2014, 10:02 AM
Forum: RADIO MODIFICATIONS
Topic: rci 2950 mod
Replies: 10
Views: 352

Re: rci 2950 mod

Yeah on ssb ittl do 300 if i have the delay off but it runs good either way if i push both am and delay button in it makes a good driver for a 4 pill
by fat boy
Sunday, 12 October 2014, 9:13 AM
Forum: RADIO MODIFICATIONS
Topic: rci 2950 mod
Replies: 10
Views: 352

Re: rci 2950 mod

I guess that amp just has a sensitive input thats true that it is easier to drive a class ab amp i totally fogot about that theory
by fat boy
Sunday, 12 October 2014, 8:46 AM
Forum: RADIO MODIFICATIONS
Topic: rci 2950 mod
Replies: 10
Views: 352

Re: rci 2950 mod

I have to run the box with the am button pushed in to get a 50 watt carrier and swing to 200 so iguess thats ok but when i have the dx 350 in high power it dks 200 amd doesont move forward. I posted that on another thread
by fat boy
Saturday, 11 October 2014, 17:35 PM
Forum: RADIO MODIFICATIONS
Topic: rci 2950 mod
Replies: 10
Views: 352

Re: rci 2950 mod

Well with the rci into a dx 350 it will only do 200 watts with the rf power all the way down but ill probably just leave it alone cuz i got good reports on it
by fat boy
Saturday, 11 October 2014, 12:59 PM
Forum: RADIO MODIFICATIONS
Topic: rci 2950 mod
Replies: 10
Views: 352

rci 2950 mod

What is the mod to get full swing from 1 watt to full power
by fat boy
Saturday, 11 October 2014, 7:57 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: dx 350 deadkey
Replies: 4
Views: 212

Re: dx 350 deadkey

I guess ill stick a dummy load on it and check it. Oh the swr is 1.6 amp off or on
by fat boy
Saturday, 11 October 2014, 7:46 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: dx 350 deadkey
Replies: 4
Views: 212

Re: dx 350 deadkey

Rci2950 i didnt get any reports of a squeel or anything i got good audio reports
by fat boy
Friday, 10 October 2014, 22:25 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: dx 350 deadkey
Replies: 4
Views: 212

dx 350 deadkey

So can anyone tell me why this dx 350 dks 200 watts with 1 watt in. All buttons are out so its in high gear any suggestions
by fat boy
Thursday, 09 October 2014, 19:44 PM
Forum: GENERAL QUESTIONS
Topic: Humming uniden
Replies: 4
Views: 281

Re: Humming uniden

On your washington the transformer is always hot when the radio is plugged in the power switch on the radio only controls the radio part itself so that being said is it very normal to have some hum when the transformers get old as long as you dont have reports of a hum in your transmitted audio. You...
by fat boy
Thursday, 09 October 2014, 17:16 PM
Forum: ANTENNA HELP
Topic: 102 +spring swr
Replies: 9
Views: 442

Re: 102 +spring swr

Well i figured it out the swr is actually fine. When i first tested it. I was parked in front of a metal building. I should know better. The swr is actually 1.2 or 1.3 thanks anyway i planned on getting a rigid riser its just that the spring is all i had to try at the moment
by fat boy
Thursday, 09 October 2014, 15:35 PM
Forum: ANTENNA HELP
Topic: 102 +spring swr
Replies: 9
Views: 442

102 +spring swr

This is what i just put in my buddies truck i cant get the swr below 1.8 on 27.415 which is where we talk and he wants to run a tnt 4 pill so i know it needs at least a 1.3 or lower swr to be working properly and not burn the box anyone have any suggestions heres a pic http://s18.postimg.org/bm24elq...
by fat boy
Wednesday, 08 October 2014, 20:07 PM
Forum: GENERAL QUESTIONS
Topic: magnum 257hp low on wattage
Replies: 4
Views: 275

Re: magnum 257hp low on wattage

Its on a dummy load with plenty power supply so im working in a lab type setup thats the best way to xheck stuff out
by fat boy
Wednesday, 08 October 2014, 19:26 PM
Forum: GENERAL QUESTIONS
Topic: magnum 257hp low on wattage
Replies: 4
Views: 275

magnum 257hp low on wattage

I hooked my 257 up today and i found that its only doing 45 to 50 or so watts pep and about 20 avg shouldnt this radio be doing like 80 watts pep. I got good audio reports ssb alc is all tbe way up am dk is 10watts max and modulation is all the way. I was just wondering if anyone has experience with...
by fat boy
Saturday, 20 September 2014, 0:28 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: 2x2879 only doing 80 watts
Replies: 5
Views: 378

Re: 2x2879 only doing 80 watts

Sounds like your output tune cap or the cap across the 2 pills in front the output xfmr is bad in my experience 1 bad pill=0 watts. So pills are probably fine just need to check caps should be somewhere between 100 and 200pf on the output tune and you should have a 1000pf across the output xfmr just...
by fat boy
Sunday, 07 September 2014, 19:28 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: 2 pill build
Replies: 0
Views: 324

2 pill build

Just starting a new 2 pill driver. I ripped apart my old tx star 250 drilled and cut me a board kept as much as i could from the 250 need to order some parts but its a work in progress any opinions or suggestion from fellow amp guys is appreciated http://s4.postimg.org/xrivevu1l/20140907_113023.jpg
by fat boy
Sunday, 07 September 2014, 19:21 PM
Forum: GENERAL QUESTIONS
Topic: 4 pill
Replies: 17
Views: 518

Re: 4 pill

Let me start a new topic as i am interested in amp building
by fat boy
Sunday, 07 September 2014, 12:16 PM
Forum: GENERAL QUESTIONS
Topic: 4 pill
Replies: 17
Views: 518

Re: 4 pill

Man why do yall not like **Censored**. I have a **Censored** 4 pill used but it is original it works fine not a single issue with it. Does 800 its an ab box looks good on the scope and spectrum analyzer
by fat boy
Saturday, 06 September 2014, 21:44 PM
Forum: GENERAL QUESTIONS
Topic: 4 pill
Replies: 17
Views: 518

Re: 4 pill

So what do you think about the Fat Boy 4x2879 because thinking about getting back into it my Radio Cobra 29 LTD Classic w/ RFX-75 and Fat Boy 4x2879 Hey outlaw did you ever think of ordering a **Censored** amp it may take you 6 to 7 months to get it but hes a 1 man operation and very thorough doesn...
by fat boy
Friday, 05 September 2014, 22:53 PM
Forum: ANTENNA HELP
Topic: Here we go coax length important ?
Replies: 26
Views: 904

Re: Here we go coax length important ?

In my experience. Coax length does not matter as long as the connectors are done right and you have good connections if you have any issues it has to be with the antenna itself as far as the radios swr meter they are only as good as a tech can tune it I don't trust radio meters unless I tuned it mys...
by fat boy
Friday, 05 September 2014, 7:48 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Power supply weak
Replies: 12
Views: 368

Re: Power supply weak

Thattl run a 4 pill and a radio all day long -- Monday, 29 September 2014, 16:47 PM -- Hey hank got her fixed up man with a variable and digital volt/ammeter she works great http://s1.postimg.org/k5470u6aj/20140929_172347.jpg http://s1.postimg.org/ly73p5rh7/20140929_172353.jpg http://s1.postimg.org/...
by fat boy
Thursday, 04 September 2014, 19:46 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Power supply weak
Replies: 12
Views: 368

Re: Power supply weak

I will pm u
by fat boy
Thursday, 04 September 2014, 14:10 PM
Forum: MOBILE SETUPS
Topic: Dead Key & Swing
Replies: 18
Views: 487

Re: Dead Key & Swing

Sounds like you have an avg reading wattmeter that dont read pep what kind of wattmeter is it those things can be tricky if you dont know what your doing
by fat boy
Thursday, 04 September 2014, 14:06 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Power supply weak
Replies: 12
Views: 368

Re: Power supply weak

Let me know how it works
by fat boy
Wednesday, 03 September 2014, 11:45 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Power supply weak
Replies: 12
Views: 368

Re: Power supply weak

You need to keep those insulators as they keep the transistors from shorting apply a small dab of paste to the back of the transistor the put the insulator on then apply another small dab to the insulator then screw them down it should be good to go sorry for taking so long ti reply i didnt get a no...
by fat boy
Saturday, 30 August 2014, 18:51 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: 128 pill question
Replies: 6
Views: 431

128 pill question

Just out of curiosity. How many watts pep and bird should a 128 pill amp do at the proper drive
by fat boy
Friday, 29 August 2014, 19:01 PM
Forum: RADIO MODIFICATIONS
Topic: tr696fd1 dual final conversion
Replies: 15
Views: 445

Re: tr696fd1 dual final conversion

Well i guess i got it right it has the channels and riger beep mod too i couldnt find a 103 variable resistor in my junk so i didnt install the variable power yet. I did noticed something odd though as this radio warms up it transmits a static in the am carrier on a dead key even if the mic gain is ...
by fat boy
Friday, 29 August 2014, 11:00 AM
Forum: RADIO MODIFICATIONS
Topic: tr696fd1 dual final conversion
Replies: 15
Views: 445

Re: tr696fd1 dual final conversion

Put q39 back and did the diode mod now i get 2 watts swinging 6 on avg 25pep 25 on ssb the alc and am modulation is all the way up i have not tested it on the air yet just on a dummy load
by fat boy
Wednesday, 27 August 2014, 21:57 PM
Forum: RADIO MODIFICATIONS
Topic: tr696fd1 dual final conversion
Replies: 15
Views: 445

Re: tr696fd1 dual final conversion

What does q39 do in this radio i was looking inside and noticed that it was clipped and also i noticed that my avg power on am doesnt swing when modulated is there a swing mod that i can do to this radio without hurting it?
by fat boy
Tuesday, 26 August 2014, 15:56 PM
Forum: RADIO MODIFICATIONS
Topic: tr696fd1 dual final conversion
Replies: 15
Views: 445

Re: tr696fd1 dual final conversion

What parts do i need to add variable power on this radio i looked at the 959 schematic and i know i have to put a 5k pot across j17 but to i need to add anythi g else
by fat boy
Tuesday, 26 August 2014, 8:04 AM
Forum: RADIO MODIFICATIONS
Topic: tr696fd1 dual final conversion
Replies: 15
Views: 445

Re: tr696fd1 dual final conversion

A 2sc2029 is what comes in the new cobra 29s i think. Its a 27 mhz transistor
by fat boy
Monday, 25 August 2014, 22:02 PM
Forum: OTHER TECHNICAL QUESTIONS
Topic: tr696fd1 power output
Replies: 1
Views: 138

tr696fd1 power output

How many watts should i expect with a good tune on this radio
by fat boy
Monday, 25 August 2014, 12:19 PM
Forum: RADIO MODIFICATIONS
Topic: tr696fd1 dual final conversion
Replies: 15
Views: 445

Re: tr696fd1 dual final conversion

What kind of power would i see from 2 2sc2029s in this radio
by fat boy
Monday, 25 August 2014, 9:01 AM
Forum: RADIO MODIFICATIONS
Topic: tr696fd1 dual final conversion
Replies: 15
Views: 445

tr696fd1 dual final conversion

Does any know a procedure and components i need to make my tr696fd1 single 1969 into a dual final 2078 or dual mosfet final radio
by fat boy
Monday, 25 August 2014, 7:50 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Power supply weak
Replies: 12
Views: 368

Re: Power supply weak

Yeah i forgot the discharge cap part you should use a resistor to discharge the cap a 10 ohm or 100 ohm will do just fine
by fat boy
Sunday, 24 August 2014, 21:56 PM
Forum: MOBILE/BASE INSTALL HELP
Topic: Radio Suggestions
Replies: 11
Views: 1023

Re: Radio Suggestions

Yaesu ft857d or ft100 the 100 can only be found used
by fat boy
Sunday, 24 August 2014, 19:47 PM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Power supply weak
Replies: 12
Views: 368

Re: Power supply weak

Well the first thing i would do is check the power transistor's the collector voltage to see if it anywhere between 18 and 25 volts then check the base voltage the base voltage should be around 14 to 16 ish volts if you have that voltage at the base of the power transistors they may be open and just...
by fat boy
Saturday, 23 August 2014, 10:39 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: ab biasing
Replies: 23
Views: 1108

Re: ab biasing

The regs are heatsink mounted i did a 10 minute keydown test on the bias circuit and it didnt overheat besides the regs have an automatic thermal shutdown so it would never blow the pills in the event of a failure
by fat boy
Wednesday, 20 August 2014, 7:59 AM
Forum: AMPLIFIERS / POWER SUPPLIES
Topic: Motorola SRF3749
Replies: 8
Views: 432

Re: Motorola SRF3749

25 watts from 1 watt carrier is good you should see about 180 pep give or take 15 watts and around 75 or 80 bird