On Mon, 10 Jan 2011 22:36:39 -0600, Jim Shorney wrote:
If the +10 is +/- 10 mV, you're probably OK there.
I meant to type +/- 100 mV...
73
-Jim
--
Ham Radio NU0C
Lincoln, Nebraska, U.S.S.A.
TR7/RV7/R7A/L7, TR6/RV6, T4XC/R4C/L4B, NCL2000, SB104A, R390A, GT550A/RV550A,
HyGain 3750, IBM PS/2
Jim / Carl
Great checklist!
It sounds like the DR-7 is working ok in EXT mode. The 12 and 5 MHz
signals are stable, so the VCO is locking, just off by 2 MHz. I think
the problem is in the 'presets' of the Digital Control board, fed via
the DR-7. I have seen a couple of instances of PROM
Guys,
I am fairly certain the digital programming section of the DR-7 will not
affect the DR-7 display. If its just the display thats off and not the
actual TR-7 operating frequency then the problem is strickly with the
functioning of the display portion of the DR-7. The display uses the VCO
Hi Gary -
Agreed. BUT Carl said in his initial message that the counter reads
correctly in EXT mode on his HT. The digital control signals that set
the BAND DO go through the DR-7 via U9005, 6, 7 and 8, hence the need
for the Jumper Board to run without the DR-7 board in place.
A fault in
Carl -
The Jumper Board makes it a lot easier to eliminate, (or indict!,) the
DR-7. The counter preset information is carried between the Digital
Board and the Translator Board on the pins on the left side of the DR-7,
and they are susceptible to solder cracking with age, stress.
The
Sorry, that should have said that Pin 45 is chassis ground.
73, Garey - K4OAH
Glen Allen, VA
Drake 2-B, 2-C/2-NT, 4-A, 4-B, C-Line
and TR-4/C Service Supplement CDs
www.k4oah.com
Garey Barrell wrote:
He did not indicate pin 45 (it was literally zip as in .1) however
pin 43 was HI and he
That 'may' be OK, but is suspicious at best.
You need to trace back through Pin 3 and 2 of U9007, Pin 14 and 13 of
U9005, and board Pin 2/41.
I haven't been in this section before, but I would start by switching
bands as you measure each pin above, and see if _any_ of them change
state.
Hello to the group.
TR7
A: I have reseated all the boards.
Stored unit for nine months. Hooked up yesterday.
Digital freqs way off, 12xxx while in 20 M position 5xxx while in 40 M
position...etc
Did have some signals (SSB) input on the 20 M position, but mechanical
dial says way off
Some things to check (in no particular order):
Make sure all the boards are properly seated. If oxidation on the Molex
connectors is persistent, cleaning/DeOxit treatment should be used. Copper
grounding fingers should be clean and make good contact with the frame. Also
check for deformed female
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