Sounds like a "done deal" to me.
73
Bob, K4TAX
----- Original Message -----
From: "Mark Kenward" <k8vf_mark@centurytel.net>
To: <tentec@contesting.com>
Sent: Tuesday, March 25, 2014 8:56 PM
Subject: Re: [TenTec] Help needed with Paragon II alignment
Hi again, Bob. Yes I did my settings while at 14 mHz and that's where I
had the rig from the start.
Set it up just as you did, had it on an hour or more, and lid on, replaced
after any adjustment.
Well, I am within 30 hz on each end,(high at one end and low at the other)
and closer in the middle so I will call it ok.
On the BFO's, as I said, if I did them in order, I couldn't get close on
the cwT adjustments. (close to 1000Hz)Other than the FSK bfos being set
off intentionally because I had to, all else was as you said.
Ref oscillator was easy enough to get to, I slid the shield off to the
side, pulled a couple Mass connectors to get at a test point, and cap is
bottomed out, or topped out-rocking it back and forth to get it right on
and that is it.
Thanks for all your advice and friendly assistance in the past.
Sounds like I can button it up.
Best regards,
Mark Kenward
K8VF
I've repaired and aligned several of the Paragon and Paragon II radios.
This includes the ones I owned personally.
I always strived to set the BFO oscillators to be "dead nuts on" with an
accuracy of 1 Hz or better. There is some interaction between the
adjustments and I've found that going over the alignment for these some 3
or 4 times was found to be necessary. Since these "rocks" are not highly
temperature compensated some warm uptime is required and even then they
willvary with temperature. Specially true if running a high demand mode
such as RTTY that heats the inside of the case. My counter will capture
the low and high values over a period of time. I usually allow the radio
to warm up in receive with the cover on, make adjustments, lay the cover
back on and then allow it to warm again. Frankly I'm not sure how prudent
this method turns out to be. But I did spend several hours analyzing the
drift of the oscillators over time and over a temperature range.
The master osc is quite stable and is easy to adjust and it generally
stays put.
In general I felt that if I could get all bands to be less than +/- 50 Hz
that I had a good alignment job. What you find is about typical of my
notes. If you get it correct on 160M then it will be off by 2x that amount
on 10M. If you get it correct on 10 MHz then the error will be about as
you find, or about 30 Hz or less, depending on band. The further one gets
away from the 10 MHz reference the worse it gets either up or down.
The manual that I have states: "Frequency accuracy: +/- 50 Hz @ 25 degrees
C." From this info looks like your results are quite good.
73
Bob, K4TAX
----- Original Message ----- From: "Mark Kenward"
<k8vf_mark@centurytel.net>
To: <tentec@contesting.com>
Sent: Tuesday, March 25, 2014 6:59 PM
Subject: [TenTec] Help needed with Paragon II alignment
Greetings.
I recently got a Paragon II and it was out of adjustment. (Formerly
belonged to Federal Highway Dept?)
I set BFO's as well as possible.
Basically has to set fsk bfo's off a bit to get the LSB/USB/and CW
Transmit to be on freq. Which they now are. I dont use FSK.
Set reference oscillator frequency.
NOW, the rig works fine on transmit and receive, BUT:
tx/rx are right on freq at 10 mHz.
BELOW 10 mHz I am 10-30 Hz high.
ABOVE 10 mHz I am 10-30 Hz low.
The off set starts at -30 at 160 mtrs, closer as you go up in freq, till
10 mHz, then drops about 10 cycles more per band as you go up to 10
meters.
Obviously I have something buggered up.
The only other thing I adjusted was to set the PBT, which shouldnt affect
this, I do not believe.
The rig is rock solid, and doesn't drift, so I would like to get it spot
on.
Can anyone help me here?
Mark
K8VF
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
_______________________________________________
TenTec mailing list
TenTec@contesting.com
http://lists.contesting.com/mailman/listinfo/tentec
|