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28778

Re: PS7 fault

Hi Mike, I ran a KW1000 Amp with my TR7 for many years, with no issues back in the 1970’s / 80’s. 73 Keith G3VKW From: DrakeRadio@yahoogroups.com
keith evans
3:50 PM
#28778
 
28777

Re: TR-7 Advice

Without the AUX7 or some replication with diodes under the MB on a perf-board you won't be able to receive the 0-1.5MHz LF range. The UP/DOWN buttons do
Don Buska - The Radio Lab Works
3:19 PM
#28777
 
28776

Re: R-4 crystal eliminator

SI570 is good (if I remember well, it is used as LO on Elecraft KX3), the only issue is the square wave output, but the filtering on R-4C should be enough. 73
Guido Tedeschi
11:44 AM
#28776
 
28775

Trade for IC-7200

Still looking for a clean used IC-7200. Will Trade both of the following: Drake TR-4C with AC-4 PS, Mic, etc. and Icom IC-720a w/mic & original box & manual.
qrv@...
11:28 AM
#28775
 
28774

Re: PS7 fault

Mike - The Tr-7 relay is very similar to the one used for the C-Line. The C-Line relay is rated for 155VAC up to 3A per contact set. The Linear switch is a
Garey Barrell
11:11 AM
#28774
 
28773

Re: SPR-4 answers

Well, don't expect too much. There has to be a signal at the antenna to receive it. Large buildings are often pretty effective shields plus being noisy.
Richard Knoppow
11:01 AM
#28773
 
28772

Re: PS7 fault

This is an example of where an old fashioned large soldering iron can be very helpful. Most modern irons were made for working on circuit boards where there
Richard Knoppow
10:54 AM
#28772
 
28771

Re: PS7 fault

If this is a DC coil relay, it should always have a reverse suppression diode across the coil. The collapsing field creates a nasty reverse voltage spike when
Curt Nixon
10:36 AM
#28771
 
28770

Re: PS7 fault

Hi Guys Thanks once again for the help, I have fired up the rebuilt PS7 and it works just fine. The new bridge rectifier is a C3510 which is half the size of
mike.davidsohn
10:19 AM
#28770
 
28769

Re: R-4 crystal eliminator

Several months ago, I tried what Gary mentioned. I got si5351 breakout board with three outputs and a Teensy 2 atmel uc board.  It was new to Auduino coding,
Kihwal Lee
9:03 AM
#28769
 
28768

Re: R-4 crystal eliminator

Lee, I have N3ZI’s setup. It works very well unit you get to the higher frequencies 15M and 10M and then it runs out of drive. I set the project aside
Doug Coffman
8:10 AM
#28768
 
28767

Re: R-4 crystal eliminator

You might look at this schematic too: http://www.jimcom.net/elehobby/r4cdds/ddssch.gif The index page is here: http://www.jimcom.net/elehobby/r4cdds/index.html
Jim Pruitt
7:54 AM
#28767
 
28766

Re: R-4 crystal eliminator

Hello Gary. Can/would you post more specific details about your original project and how you would do it now? Thank you. Jim Pruitt On Fri, Aug 28, 2015 at
Jim Pruitt
7:53 AM
#28766
 
28765

Re: R-4 crystal eliminator

Thank you all, unfortunately Guido seems to disagree about the AD9850. On the datasheet I only looked to the phase noise thinking it was the important point
Giovanni Carboni IZ5PQT
7:41 AM
#28765
 
28764

Re: R-4 crystal eliminator

Take a look at this: http://www.jimcom.net/elehobby/r4cdds/index.html It has been posted for about 10 years now. It is in Japanese but you can see the
Jim Pruitt
7:39 AM
#28764
 
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