[MRCA] PRC-70 progress: Ranger Ryan's Concise Guide to Guide to Special Forces Communications

[jkarlow at comcast.net]

Ray -

 

A historical document with a touch of humor about Special Forces Operations
using the PRC-70 Radio.

"Ranger Ryan's Concise Guide to Guide to Special Forces Communications"
circa 1988.

 

Lots of data from the field.

 

Have fun reading! 

 

 

Jim Karlow

KA8TUR

                           

4907 Oakwood Court

Commerce Township,  Mi 48382

E-Mail:  <mailto:jkarlow at comcast.net> jkarlow at comcast.net

Tel/Cell: 248-961-2034

 

 

 

From: mrca-bounces at mailman.qth.net <mrca-bounces at mailman.qth.net> On Behalf
Of Ray Fantini
Sent: Friday, November 25, 2022 4:38 PM
To: mrca at mailman.qth.net; MMRCG <MMRCG at groups.io>;
milsurplus at mailman.qth.net
Subject: [MRCA] PRC-70 progress

 

End result of the RT-1133/PRC-70, thanks for all the help from everyone.
After learning what the test points on the motherboard were discovered that
the 1A1A4 +10 and +5 regulator were only supplying +5 and not +10. It did
have its +24 volts from the filter and -5 volt card. Checking the test point
discovered that the +10 volt bus was grounded and after removing the 1A1A4
card the short went away. After way too much time spent removing the tin
work from the regulator discovered that C4, a 47 uf capacitor was shorted
and dragging down the bus, replaced that cap and now the radio is working.
Looks like I may have to read the operators manual to figure out the auto
tune deal, is it completed when it beeps three times? Or will the tone go
away? Next quest is do I have to reinstall the sardine can around the supply
or not?

 

Ray F/KA3EKH

 

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