SUPER SCANNER QUESTION

[TonyV225]

I had a friend call and he has a super scanner the latest or newest style they made before stopping production. He needs input on a part thats in the relay box on the antenna its a capacitor I believe he said and its not labled with a value.

Its the cap that controls The omni directional I guess and if you over powered the antenna it was known to blow out. He wants to know what it needs to be replaced with The part is (Top Row) CMO5FD..... (Middle Row) 241JO3..... (Bottom Row) SAHA Thanks....Tony

 

[TonyV225]

Nobody knows what this part is or noboduy here has blown one up on the omnidirectional setting running to much input power?

 

[BOOTY MONSTER]

i dont know if it gives the answer youre looking for . but the pdf of the owners gives schematics of the boxes on page 11 .

http://www.cbtricks.com/ant_manuals/ant_specialists/ms_119/graphics/super_scanner_ms119_om.pdf

 

[Wire Weasel]

How does he know the capacitor is bad? Is it burned looking or something?

I have a capacitance meter for finding values of unknown caps. Ya can get a pretty decent one off ebay for around $45

Good luck

 

[Robb]

My experience with blown caps in antennas is limited to a K-40 mobile antenna. But I believe the principles involved with having one on an antenna are the same. You be the judge...

The cap was used to make a more uniform SWR across the 40 channels. Without it, both ch 1 & 40 were a bit higher. A cap is used to electrically shorten the wave length of the antenna.

My cap popped because I put a 250 watt linear amp thru it - snapped it in two. I' sure the value won't be the same as the K-40, as the length of its radiator is obviously shorter than the super-scanner. If he bought a handful of different values of caps and played around with them - I'll bet he gets close or even right on with some patience. Shouldn't cost more than a few dollars to 'shotgun' it.

There was a web page on the net of a guy who rebuilt one of these - dunno if it is still out there any more.

Wish I could help more - but there it is...

 

[BOOTY MONSTER]

A/S Super Scanner

"The older versions of the antenna used a coaxial stub to match the impedance when in the omni mode. You could run a fairly good amount of power through it with no problem. But the newer version used a different impedance transforming scheme, which could only reportedly take about 50 watts or so before burning it out. Running in the directional mode, and you could run up to 1500 watts with no problem. But you only had to forget once and switch back to omni and Poof! You also had to refrain from running high power and switching the antenna to a different direction while keyed, or you risked welding the switching relay contacts, which was also what usually happened if one of these antennas was the unfortunate victim of a lightning strike."

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"There was a web page on the net of a guy who rebuilt one of these - dunno if it is still out there any more."

10 Meter "Super Scanner" Antenna Project - How to Modify the Original Super Scanner for 10 Meters!

 

[Shockwave]

I had a friend call and he has a super scanner the latest or newest style they made before stopping production. He needs input on a part thats in the relay box on the antenna its a capacitor I believe he said and its not labled with a value.

Its the cap that controls The omni directional I guess and if you over powered the antenna it was known to blow out. He wants to know what it needs to be replaced with The part is (Top Row) CMO5FD..... (Middle Row) 241JO3..... (Bottom Row) SAHA Thanks....Tony

Tony, you need a 240 pf capacitor. I would replace it with a Semco metal cased mica. The higher the voltage the more power it will handle. You can get them from RF parts.

 

[TonyV225]

I also know there is a coil in the relay box next to the cap but if that coil was bad it would be plain as day or noticeable by looking at it so hes going to have to test that coil and make sure theres a connection. I have a few of these antennas and have never messed with them Im tempted to crack one of the boxes open to see what this things all about.

I cant imagine how exactly they made these crazy things work it should be pretty interesting to say the least. I tell ya if they still made these I bet they would sell like hotcakes at the right price.