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Messages - kopcicle

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1
Ham Radio Circuits and Repair / HR2510
« on: May 12, 2018, 02:00:57 PM »
 PB-111AB , I need the X-ray of the mainboard , my manual didn't include it  :-/

2
Test Equipment / Re: Gaw 1500 Signal generator for CB
« on: April 23, 2016, 05:19:32 PM »
If it is one of GAW Electronics Inc offerings it would be a 70's design and of one of two methods . a multi chip synthesizer much like the older SBE Formula D or based on the just available mc145106 or 145109 Motorola (I'll catch shit for this) derived from the Fairchild SM5104 line .

There were other PLL/Digital Dividers from that era but those are the common ones.
The rest of it would be a decade/BCD counter , several pierce oscillators and a colpits for fine tuning .
all that remains is stability and attenuation circuits .

shouldn't be that hard :-)

~kop   

3
How CB radio works / Re: Understanding how CB radio works
« on: April 23, 2016, 02:12:52 PM »
was meaning to say that the recent "soundtracker" scheme was a disaster ...

I have another for you .

                            am                   lsb                 usb
n                         113                   113               113
3xF0 (MHZ)      33.8575          33.8525         33.8578
Nx10khz (MHZ)  1.13                 1.13               1.13 
Fl (MHZ)           34.9875           34.9825         34.9875
Fif (MHZ)            7.8025             7.7975           7.8025
Ft (MHZ)           27.185             27.185           27.185   

What if ...

F0 (MHZ)         11.285833333  11.284166667  11.285933333               
Nx10khz (MHZ)  1.13                 1.13                  1.13 
Fl (MHZ)           12.415833333  12.414166667 34.9875
Fif (MHZ)            7.8025             7.7975              7.8025
Ft (MHZ)           4.613333333    4.616666667    4.613333333

(if -1.13 MHZ)   3.483333333    3.486666667    3.483333333

@ 3.48mhz  with at least a decade of count (1.13 MHZ)left going down this would allow 80m coverage :-)
Admittedly the 10khz channel spacing is a kludge and the receive audio isn't the best but the lot of the UPD858 SSB chassis are known to be stable frequency wise and have terrific transmit audio .

Yes it would require a complete re-tune of the if and rf but the transformers are still available in the form factor necessary .
I may be full of static but the thought passed and I  had to share ...

~kop

4
Electronic Video Blog / Re: #42 Shop Talk Capacitors gone wild
« on: April 13, 2016, 11:00:45 PM »
http://ww.badcaps.net/forum/showthread.php?p=14041#post14041
I can elaborate on how the majority of RECENT bad caps happened . (more tech urban legend )
Or I can relate how original "Beaver" paper caps in a Hy-Gain afterburner detonate .
Then there was the oil filled in an original HA-10 (Heathkit Warrior) that split , leaked , only the solid copper case contained the explosion .

A) a variac is a very good idea for lighting off old tube gear .
B) pools of toxic capacitor oil under the device might be a good clue that the apocalypse is near
C) Just replace 40 year old caps before even turning the thing on .
D) have some one else flip the switch
E) all of the above

The above has been brought to you by the ubetcha bar and grill , guaranteed not to rust , bust , crack , peel or make your mother feel bad .

~kop 

5
How CB radio works / Re: Understanding how CB radio works
« on: April 12, 2016, 03:44:24 AM »
Maybe I remember this ...
the 10.240mhz is divided two different ways
by 1024 to get the 10khz channel spacing and by 2 to get 5.12mhz that is then tripled for 15.360
So ...
.91+ 15.360 + 10.695 = 26.965mhz
The difference between 10.695 and 10.240 is 455khz which "kinda" explains the receive .
nifty little bit of engineering save for the Tc9106 rom locked pos .
This is for the classic Uniden 25/29 LTD mix
I spent just short of 20 seconds in a recent 29 before turning it into a door stop ....

~kop

6
New member welcome / greatest has been that never was
« on: April 12, 2016, 03:21:45 AM »
I'm a bit rough on the troops at times . irreverent , irascible , acerbic , dirty old man with out remorse . I do have my good side . I really do teach what I learn and try to have some humor about it . Problem is I also have no problem calling an inept time waster just that , a waste of time . Guess I'll have to work on that .
I have nearly 30 years experience working on all common makes of motorcycle and and somewhat less experience working on those I can't spell . I honestly don't have a brand preference and believe that anything less than that you ride being more important than what you ride is a posture for a--hats , imbeciles and docile media led lemmings of the American public .

I started in radio by winding wire on a quaker oats box and listening through war surplus high impedance headphones . The first transmitter was a keyed 807 oscillator and the receiver a two tube regen . Grandfather was instrumental in  developing long range communications for B17's flying over Europe and pioneered the “flying wire” that is now used to talk ULF to submarines . I , like so many , was involved in early citizens band radio . A white face Knight , a Cam88 , A Citiphone SS and finally a Johnson Viking II (w/6146's and a complete rework of the audio circuit (can't leave well enough alone) . I returned from the service to transistors and early IC's . I still have a box of the original Cybernet 02A boards that I continue HF experiments with . I have the usual collection of Uniden and rebranded junk as well as a few more familiar pieces like a 390A , 1011c , 101's , Henry Tempo One , Uniden 2020 and at least one or two general coverage receivers , transmitters and transceivers . 
I dabble in 3,200VDC @ several amps (hint around 27.120MHZ)  as well as 50VDC @ several hundred amps (hint I'm a welder as well as experimenting with LDMOS) . I've even rebuilt or modified the audio output sections of echo ranging  equipment for fun and profit .
I listen everywhere and talk where my self imposed restrictions allow . There is still some question where my grandfathered General Radiotelephone License is applicable and even if it's still valid . I don't promote or condone unlicensed use of radio frequencies however I'll not impede nor discourage genuine innovation and experimentation either . Spirit of the law if you will  .

I digress , as per usual . If I reach the edges of your tolerance please inform me , publicly if necessary . I'm far beyond the age where a bruised ego means anything more than your using my transgression to show the rank and file what is and isn't allowed as well as keep my arrogant self out of trouble long enough to be of some assistance .

I do hope that this will be a fruitful and valuable if not at times difficult union .Online help , derision , insults , and outright laughing at you is available any time I'm actually at a keyboard . I'm only a PM or email  away  . The only request is that if it is of a unique and useful nature and that after having your ego bruised and your sensibilities offended beyond all sane expectations please post a synopsis of the problem , diagnosis and repair to the forum . I'd do it for you but I feel I've already done my bit by making you feel small , ignorant , inept and oh by the way , helping fix the problem .

..laughing with you , not at you

~Kop

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