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 Colt Excalibur PTBM 125A4X

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redeye68
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redeye68

Call Sign : 26CT868
Posts : 3
Times Thanked : 0
Join date : 2019-08-11
QTH or Location : Surrey
Equipment Used : Various

Colt Excalibur PTBM 125A4X Empty
PostSubject: Colt Excalibur PTBM 125A4X   Colt Excalibur PTBM 125A4X Icon_minitimeSun Apr 19, 2020 1:37 pm

Hello all,

Hope you are all staying safe and well locked up in your Shacks.

I've dug out as above radio and it works fine it's a 4 Band A B C D version with low lows on the NB switch, Bleep switched on the ANL switch sounds like a Nato bleep. All reports I've had say the Audio sounds good so happy with that.

Just one problem the Squelch THUMP! so can someone with knowledge please advise if there is a way to fix this please. any input would be greatly received many thanks.

Cheers and Beers

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NUBSTER
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NUBSTER

Call Sign : 26 CT050 26 FB080 26 WT105 26 TE171
Posts : 186
Times Thanked : 17
Join date : 2019-06-27
QTH or Location : PALMERS GREEN NORTH LONDON
Equipment Used : original President Lincoln, Midland 8001XT, President Teddy , Silver Eagle microphones , Gainmaster antenna
Age : 62

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PostSubject: Re: Colt Excalibur PTBM 125A4X   Colt Excalibur PTBM 125A4X Icon_minitimeMon Apr 20, 2020 12:50 pm

Hello there ,sorry to say it's the nature of the beast to do it lol ,I've had two of those over the years and both did it ,back when I had them there was alot more radio doctors about to do the mod on them which sorry I dont know how to do, TBH I just left it and got use to it , the thing is there is not many rig doctors about now and some might not want to work on those because of the size of it plus postage cost both ways and parts for those are getting very rare like its cousin the Jumbo which has the same problem, the only rig Dr's I know who might and i say might are a guy call "Cubwolf"(who is said to specialise in these radios ie: Excalibur, Ham Jumbo, and Maco versions) and "Black Spirit" who also is a well respected rig doctor, the thing is they both dont come on this forum anymore thay mainly to be found on Transmission 1 forum, hope this helps
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Mitch
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Posts : 20
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QTH or Location : Leicester
Equipment Used : FT-857D w/ K40 mic, 5/8 silver rod & Diamond V2000.

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PostSubject: Re: Colt Excalibur PTBM 125A4X   Colt Excalibur PTBM 125A4X Icon_minitimeMon Apr 20, 2020 1:15 pm

There is a very easy solution, just solder a 1uF electrolytic between the base and collector of Q27, on a 125/131 board (Q25 on a 133), it won't eliminate it altogether but it's a whole lot better. Pics below to help.

Colt Excalibur PTBM 125A4X Fig111

Colt Excalibur PTBM 125A4X Fig211

Colt Excalibur PTBM 125A4X Fig311
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redeye68
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redeye68

Call Sign : 26CT868
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Join date : 2019-08-11
QTH or Location : Surrey
Equipment Used : Various

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PostSubject: Re: Colt Excalibur PTBM 125A4X   Colt Excalibur PTBM 125A4X Icon_minitimeMon Apr 20, 2020 1:55 pm

Thank you,

Nubster and Mitch for the replies, Nubster yeh I did the fix on my old Jumbo and it worked well now sold on. Thanks for the info on the rig doc's might try them for a tune up of the old girl getting on now not sure how old but must be 35-40 years I'm sure.

Mitch perfect thank you for taking the time to upload the info pic's and schematic very helpful top man.

I did look for info on this subject before posting but no results found anywhere lot's on other cybernet boards but could not find a thing on this one.

Stay safe good DX
73
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NUBSTER
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NUBSTER

Call Sign : 26 CT050 26 FB080 26 WT105 26 TE171
Posts : 186
Times Thanked : 17
Join date : 2019-06-27
QTH or Location : PALMERS GREEN NORTH LONDON
Equipment Used : original President Lincoln, Midland 8001XT, President Teddy , Silver Eagle microphones , Gainmaster antenna
Age : 62

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PostSubject: Re: Colt Excalibur PTBM 125A4X   Colt Excalibur PTBM 125A4X Icon_minitimeTue Apr 21, 2020 9:47 am

Your welcome glad to help
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