Hello All:

Yeah really! My neighbor set his K40 on fire with about 250 watts, and
wanted another new one as they had a guarantee on them to be replaced. I
went with him to the CB shop down town. The lady threw the K40 antenna
into a large box with even more K40's in it! TILT! And said it will be a
while before I get more in!

I said give the K40 back and we will fix it. The 130 pF capacitor had
fried inside the base of the antenna. It was a common mass produced
cheapie capacitor. I replaced the burnt one with 2 each 260 pF caps
wired in parallel to make the 130 pF value. These where Mica 500 VDC
Capacitors. It was a real Bear it get all put back together. We also
replaced the RG-58C CB cheapie coax with RG142 Teflon coax as this will
handle more power safely than the unknown mass produced cheapie coax.

Besides who wants to pay 25 dollars a pop for a transistor for unknown
coax catching on fire?? I sure don't especially with a 8 pill amp!

The K40 worked great after the mod. A few turns of black tape around the
burnt plastic base assebly and some High Gloss Black Paint make it look
real spif a row, Ten-4! We painted on it K40-1 Can do easy G.I.

Jay in the Mojave


PowerHouse Communications wrote:

So that little capacitor in the base of the coil can handle the full 500
watts?

We're goin' in! good job Jay.

Jay in the Mojave wrote:
We painted on it K40-1 Can do easy G.I.

Jay in the Mojave

On Tue, 24 Oct 2006 17:15:29 -0700, Jay in the Mojave wrote:

Hello All:

Yeah really! My neighbor set his K40 on fire with about 250 watts, and
wanted another new one as they had a guarantee on them to be replaced. I
went with him to the CB shop down town. The lady threw the K40 antenna
into a large box with even more K40's in it! TILT! And said it will be a
while before I get more in!

I said give the K40 back and we will fix it. The 130 pF capacitor had
fried inside the base of the antenna. It was a common mass produced
cheapie capacitor. I replaced the burnt one with 2 each 260 pF caps
wired in parallel to make the 130 pF value.


I thought caps in parallel acted like resisitor in series? That would make it
520 instead of 130. But dman, now you got me thinking. I am going to have to go
look it up. I don't recall for sure.

http://www.play-hookey.com/dc_theory...apacitors.html



These where Mica 500 VDC
Capacitors. It was a real Bear it get all put back together. We also
replaced the RG-58C CB cheapie coax with RG142 Teflon coax as this will
handle more power safely than the unknown mass produced cheapie coax.

Besides who wants to pay 25 dollars a pop for a transistor for unknown
coax catching on fire?? I sure don't especially with a 8 pill amp!

The K40 worked great after the mod. A few turns of black tape around the
burnt plastic base assebly and some High Gloss Black Paint make it look
real spif a row, Ten-4! We painted on it K40-1 Can do easy G.I.

Jay in the Mojave


Where is that cap located? I tossed my K40. One problem was the whipw as too
rigid.

Vinnie S.

I said give the K40 back and we will fix it. The 130 pF capacitor had
fried inside the base of the antenna. It was a common mass produced
cheapie capacitor. I replaced the burnt one with 2 each 260 pF caps
wired in parallel to make the 130 pF value.


I thought caps in parallel acted like resisitor in series? That would make it
520 instead of 130. But dman, now you got me thinking. I am going to have to go
look it up. I don't recall for sure.

http://www.play-hookey.com/dc_theory...apacitors.html

Two caps in parallel are additive.

I may be wrong but I believe the cap value in a K-40 is 55 pf

Vinnie S. wrote:

On Tue, 24 Oct 2006 17:15:29 -0700, Jay in the Mojave wrote:


Hello All:

Yeah really! My neighbor set his K40 on fire with about 250 watts, and
wanted another new one as they had a guarantee on them to be replaced. I
went with him to the CB shop down town. The lady threw the K40 antenna
into a large box with even more K40's in it! TILT! And said it will be a
while before I get more in!

I said give the K40 back and we will fix it. The 130 pF capacitor had
fried inside the base of the antenna. It was a common mass produced
cheapie capacitor. I replaced the burnt one with 2 each 260 pF caps
wired in parallel to make the 130 pF value.



I thought caps in parallel acted like resisitor in series? That would make it
520 instead of 130. But dman, now you got me thinking. I am going to have to go
look it up. I don't recall for sure.

http://www.play-hookey.com/dc_theory...apacitors.html




These where Mica 500 VDC
Capacitors. It was a real Bear it get all put back together. We also
replaced the RG-58C CB cheapie coax with RG142 Teflon coax as this will
handle more power safely than the unknown mass produced cheapie coax.


Besides who wants to pay 25 dollars a pop for a transistor for unknown
coax catching on fire?? I sure don't especially with a 8 pill amp!

The K40 worked great after the mod. A few turns of black tape around the
burnt plastic base assebly and some High Gloss Black Paint make it look
real spif a row, Ten-4! We painted on it K40-1 Can do easy G.I.

Jay in the Mojave



Where is that cap located? I tossed my K40. One problem was the whipw as too
rigid.

Vinnie S.


Hello Vinnie: Yep your right! I stand corrected. Had to wire em in series.

Jay in the Mojave

On Tue, 24 Oct 2006 20:03:17 -0700, Jay in the Mojave wrote:


Where is that cap located? I tossed my K40. One problem was the whipw as too
rigid.

Vinnie S.


Hello Vinnie: Yep your right! I stand corrected. Had to wire em in series.

Jay in the Mojave


The other problem I had with the antenna, was the rigidity, as I mention. The
whip is great on the highway, but go into a bank drive-thru or ot a tree lined
street, and it sound like the roof was going to be torn off.

Vinnie S.