Codar CR70A Service Sheet help with missing text. - UK Vintage Radio Repair and Restoration Discussion Forum

sureshotsyd · 30th Dec 2015, 1:31 pm

Hello Folks,

I have a downloaded Service sheet for the CR70A, but there is one particular word which is not clear on the print out or on the download. It is in the paragraph on IF alignment, Line 3 begins "short circuit" then the next word, possibly 4 letters, is faint, followed by "gang section (oscillation)".

Does anybody please have an original copy of this sheet, and would they be willing to just tell me what this word is?

I should presumably be able to make an educated guess, but since it was a minor miracle that I qualified to become a "Special Operator" in Royal Signals, and then subsequently pass the Radio Amateurs' exam, as my Radio Theory leaves much too be desired, the words 'short circuit' are somewhat worrying.

All replies and advice greatly appreciated
thanks in advance
Dave G0SKK

dave walsh · 30th Dec 2015, 2:16 pm

Welcome to the Forum Dave. I'm sorry I can't help with this specific enquiry but there have been a number of threads re the Codar Company in the past and various sets including yours. It proved hard to pull out info on either but the CR70A model was better recorded than others. If you do a Codar search via the "top box" there may be other comments that prove useful to you as well!
Dave W

Station X · 30th Dec 2015, 2:59 pm

The word is probably "rear" or "back".

What is means is that you must short-circuit the local oscillator section of the tuning capacitor to disable the local oscilator during IF alignment. Otherwise stations might break through into the IF circuits.

sureshotsyd · 30th Dec 2015, 4:11 pm

My word Graham and Dave, that was quick !
Many thanks to both of you, I'm now searching for said sig gen.

Thanks again
Dave

30th Dec 2015, 1:31 pm	#1
sureshotsyd Diode Join Date: Dec 2015 Location: Tamworth, Staffordshire, UK. Posts: 3	Codar CR70A Service Sheet help with missing text. Hello Folks, I have a downloaded Service sheet for the CR70A, but there is one particular word which is not clear on the print out or on the download. It is in the paragraph on IF alignment, Line 3 begins "short circuit" then the next word, possibly 4 letters, is faint, followed by "gang section (oscillation)". Does anybody please have an original copy of this sheet, and would they be willing to just tell me what this word is? I should presumably be able to make an educated guess, but since it was a minor miracle that I qualified to become a "Special Operator" in Royal Signals, and then subsequently pass the Radio Amateurs' exam, as my Radio Theory leaves much too be desired, the words 'short circuit' are somewhat worrying. All replies and advice greatly appreciated thanks in advance Dave G0SKK

30th Dec 2015, 2:16 pm	#2
dave walsh Dekatron Join Date: Jan 2006 Location: Ramsbottom (Nr Bury) Lancs or Bexhill (Nr Hastings) Sussex. Posts: 5,817	Re: Codar CR70A Service Sheet help with missing bits Welcome to the Forum Dave. I'm sorry I can't help with this specific enquiry but there have been a number of threads re the Codar Company in the past and various sets including yours. It proved hard to pull out info on either but the CR70A model was better recorded than others. If you do a Codar search via the "top box" there may be other comments that prove useful to you as well! Dave W Last edited by dave walsh; 30th Dec 2015 at 2:25 pm.

30th Dec 2015, 2:59 pm	#3
Station X Moderator Join Date: Jan 2003 Location: Ipswich, Suffolk, IP4, UK. Posts: 21,290	Re: Codar CR70A Service Sheet help with missing bits The word is probably "rear" or "back". What is means is that you must short-circuit the local oscillator section of the tuning capacitor to disable the local oscilator during IF alignment. Otherwise stations might break through into the IF circuits. __________________ Graham. Forum Moderator Reach for your meter before you reach for your soldering iron.

30th Dec 2015, 4:11 pm	#4
sureshotsyd Diode Join Date: Dec 2015 Location: Tamworth, Staffordshire, UK. Posts: 3	Re: Codar CR70A Service Sheet help with missing text. My word Graham and Dave, that was quick ! Many thanks to both of you, I'm now searching for said sig gen. Thanks again Dave