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 President Grant 2 is it antenna fussy

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BillMasen
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Join date : 2020-04-20
QTH or Location : Co Durham
Equipment Used : President Grant 2

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PostSubject: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeWed Apr 22, 2020 6:15 pm

Been trying for months to get my Pres Grant 2 to operate but no matter where I fit it , EG nin my van or home, no matter what twig I use I cannot get the SWR down. I'm totally baffled and looking around for likely causes. Its never been used operationally though I've had it 3 years because I've never managed to get the SWR under 10.
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BillMasen
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Equipment Used : President Grant 2

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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeThu Apr 23, 2020 8:35 am

Saw your reply on other thread, cheers Mate. Following SWR instructions to letter that came with SWR meter, I'm starting to suspect patch leads and cable from Magmount, tried Three different CB antenna from Thunderpole including an 18footer, and a based loaded mobile whip.

On and off I've been into CB since 1976 Smile
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BillMasen
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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeThu Apr 23, 2020 8:50 am

its steel, Transit van roof 8ft by 6ft
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BillMasen
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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeThu Apr 23, 2020 8:58 am

Yes mate I'm guessing dodgy ant cable or dodgy SWR meter or its patch lead, Its a bloody nightmare not being able to visit a shop for spares and advise. I appreciate your help.

BTW I just posted another antenna question if your feeling helpful Smile

Bill
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Alan Pilot
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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeThu Apr 23, 2020 12:57 pm

Have you got a multimeter to test the coax for a short.
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BillMasen
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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeThu Apr 23, 2020 1:11 pm

Trying to borrow one today, mines bust.
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Northern Crusader
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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeFri Apr 24, 2020 4:58 pm

Alan Pilot wrote:
Have you got a multimeter to test the coax for a short.

It doesn't have to be shorted to give high SWR. The impedance of coax is determined by the spacing between the outer surface of the centre conductor and the inner surface of the braid. Alter that and it alters the impedance of the coax which affects the SWR.

In mobile installs with high SWR coax pinched or crushed where it comes into the car which measures OK with a DC multimeter has led many a person on a wild goose chase.
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Alan Pilot
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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeFri Apr 24, 2020 6:02 pm

Northern Crusader wrote:
Alan Pilot wrote:
Have you got a multimeter to test the coax for a short.

It doesn't have to be shorted to give high SWR. The impedance of coax is determined by the spacing between the outer surface of the centre conductor and the inner surface of the braid. Alter that and it alters the impedance of the coax which affects the SWR.

In mobile installs with high SWR coax pinched or crushed where it comes into the car which measures OK with a DC multimeter has led many a person on a wild goose chase.
I did say to test for a short.
That's the first thing i do then test for continuity after that.
Everybody has there own path of fault finding i suppose.
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Northern Crusader
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Call Sign : M0GVZ / 26CT1760
Posts : 371
Times Thanked : 23
Join date : 2019-11-13
QTH or Location : IO94SA
Equipment Used : Icom 7300, TS480, President McKinley, Albrecht AE6110, CRT Mike
Age : 50

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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeSun Apr 26, 2020 11:52 am

Alan Pilot wrote:

I did say to test for a short.
That's the first thing i do then test for continuity after that.
Everybody has there own path of fault finding i suppose.

Neither will tell you that you're getting high SWR because of pinched coax so using those alone won't rule out everything. Ironically you don't need a meter to measure it, you can see it with the naked eye. If the coax is flattened, even a little bit, or it's been bent tighter than the minimum bend radius in the specs then that's likely the reason assuming no dodgy soldered on connectors.
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Alan Pilot
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PostSubject: Re: President Grant 2 is it antenna fussy   president - President Grant 2  is it antenna fussy Icon_minitimeSun Apr 26, 2020 6:06 pm

A multimeter will tell you if you have the dodgy soldered on connectors as mentioned above.
It will also tell you if you have a stray bit of the outer shield touching the centre cable.
It won't do the swr but will rule out bad connections.

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