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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 10 + Year member
Call Sign : 26 CT050 26 FB080 26 WT105 26 TE171 Posts : 948 Times Thanked : 51 Join date : 2019-06-27 QTH or Location : NORTH LONDON Equipment Used : ORIGINAL President Lincoln, President Teddy , Silver Eagle microphones , Gainmaster antenna, use a AMP ofcourse I do sometimes Age : 66
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
Mitch Contributor
Call Sign : M1TCH Posts : 79 Times Thanked : 8 Join date : 2020-01-02 QTH or Location : Leicester Equipment Used : Yaesu FT-857D, Diamond V2000, Major 3000, President Jackson Mk1, Lafayette AFS-1005, K40 mic, KL203, B550P and Sirio GPE 27 ⅝λ.
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.
redeye68 New Member
Call Sign : 26CT868 Posts : 5 Times Thanked : 0 Join date : 2019-08-11 QTH or Location : Surrey Equipment Used : Various
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 10 + Year member
Call Sign : 26 CT050 26 FB080 26 WT105 26 TE171 Posts : 948 Times Thanked : 51 Join date : 2019-06-27 QTH or Location : NORTH LONDON Equipment Used : ORIGINAL President Lincoln, President Teddy , Silver Eagle microphones , Gainmaster antenna, use a AMP ofcourse I do sometimes Age : 66
Today at 6:48 am by iherup888
Subject: Colt Excalibur PTBM 125A4X 
