Ranger AR3500 intermittant SSB problem

General CB Radio Advice and Troubleshooting

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gentlegiant
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Posts: 2
Joined: Sun Jul 02, 2006 10:21 pm

Sun Jul 02, 2006 10:35 pm

This seems to have everyone confounded so if anyone has the answer or at least a pointer I will be truly greatfull.

My old Ranger AR3500 has developed a problem on SSB only. After about five minutes the power output drops right off to about 1 or 2 watts. AM FM and CW are unaffected. It seems that thermal instabillity is the problem but as anyone who has tried to find thermistic component faults knows its the devils own work.

73's + Tnx

.- .-. -.-
Paul (2H3CK)
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Good Buddy
Posts: 27
Joined: Sat May 27, 2006 11:38 am
Location: London

Mon Jul 03, 2006 3:42 pm

Hi GG,
try also asking the same question on the forum at: http://www.open-channel.co.uk there are some good tech types on there.

All the best....P
All the best.....73....P
gentlegiant
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Posts: 2
Joined: Sun Jul 02, 2006 10:21 pm

Tue Jul 04, 2006 5:07 pm

Found the answer folks.

Anyone who has similar problems replacing Q27 will solve it. Since the OE spec transistor C1923 is obsolete but some 2SC1923's can be found at emense cost a repair can be effective using a general purpose NPN such as a BC548 but BE WARNED The pin designation is not the same so make double sure you insert it correctly before you solder it in place.

73's and thanks also must go to Rick for helping track this down.

:wink:
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