cisfuk wrote:
> 455-480mhz all read 19.89v and doesn't change from there when adjusting
> the vco trimmer and below 455mhz all read 0.54v and also doesn't change
> from there when adjusting vco trimmer
That seems to say the free running VCO frequency is around 453/454
(somewhere between 452.5 a
455-480mhz all read 19.89v and doesn't change from there when adjusting
the vco trimmer and below 455mhz all read 0.54v and also doesn't change
from there when adjusting vco trimmer
cisfuk wrote:
> Thanks, I fitted the oscillator on the TX module now L1 shows 19.89v
> but doesn't change when adjusting the VCO trimmer
>
You should try creating a test EPROM for the TX also with channels every
2.5 MHz and see if it can lock anywhere.
As it is pushing 19V into the VCO, it is
Thanks, I fitted the oscillator on the TX module now L1 shows 19.89v
but doesn't change when adjusting the VCO trimmer
cisfuk wrote:
> I started too but then the trimmer broke so I'm not sure what to do
> about that.
>
> http://img383.imageshack.us/img383/7035/281hg3.jpg my one only has
> 3? the bottom right is 5v.
>
You must have had a trimmer that had been glued. Look at your local
parts house for a 2 t
I started too but then the trimmer broke so I'm not sure what to do
about that.
http://img383.imageshack.us/img383/7035/281hg3.jpg my one only has
3? the bottom right is 5v.
cisfuk wrote:
> Thanks for your help with that, I took a look at the TCXO for the TX
> module today but I'm not sure which way it goes because it has 4 pins
> this is what it says on it NKG3001B 4D21 NDK 12.8Mhz
>
>
Did you get the RX VCO to lock?
WRT the TXCO, there are four holes in the cir
Thanks for your help with that, I took a look at the TCXO for the TX
module today but I'm not sure which way it goes because it has 4 pins
this is what it says on it NKG3001B 4D21 NDK 12.8Mhz
cisfuk wrote:
> L1 shows 0.17v upto 460mhz then it shows
> 460mhz = 2.5v, 465mhz = 9v, 470 = 14.8v, 475 = 3.8v, 480 = 9v
>
Discounting the 475 and 480 MHz readings, it is likely currently
centered / tuned for about 466 MHz.
It cannot require the same VCO voltage at two largely disparate
frequ
L1 shows 0.17v upto 460mhz then it shows
460mhz = 2.5v, 465mhz = 9v, 470 = 14.8v, 475 = 3.8v, 480 = 9v
cisfuk wrote:
> Thanks for that, I tried it but it just stayed at 0.17v
>
Not sure what you tried:
1. Making a EPROM with channels from 440 to 480 (or perhaps 400 to 440
if it is a -10) in 2.5 MHz steps.
2. Adjusting the VCO trimmer.
If it is #2, you will need to first move the trimmer and watc
Thanks for that, I tried it but it just stayed at 0.17v
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