"Once you have verified that the firmware is running, place a jumper shunt on JP8 and JP10. Be sure todo this at a reasonable human room temperature (like 60-80 deg. F). This is necessary because thisprocedure initializes the operating parameters in the EEPROM and also does a temperature compensationdiode calibration which needs to happen at room temperature. Once the jumper shuntshave been installed, power-cycle the board and wait for the system activity light to come on steady(about 4 seconds or so after the 5 second initial wait time). Then remove the jumper shunts."From https://allstarlink.org/votersystem.pdf page 20ChuckOn Sat, Apr 2, 2016 at 3:23 PM, Skyler F <electricity440@gmail.com> wrote:Well stupid me for not listening to you guys. I guess the hamtronics is really sensitive to low impedance outputs, and the highs get cut off if you have any sort of load at all. When I turned on the internal amplifier, the RTCM was happy with calibrating squelch.
Can anybody explain to me what "Diode calibration" means?73,
SkylerOn Wed, Mar 30, 2016 at 5:42 PM, Joe Leikhim <rhyolite@leikhim.com> wrote:Skyler;
Here is a wideband VHF 136-156 MHz radio that will solve your ham club problems for $35 each. If these were UHF I would be buying a bushel full. You will need to get the programming software from Ritron. I think it is free.
There are similar models with an enclosure, but for much more $$.
See the auction below on E-Bay:
Seller dale575
Ritron VHF Transceiver PCA, 136-156MHZ, 5 Watt, Model DTX-142-GCWD-I
http://www.ebay.com/itm/Ritron-VHF-Transceiver-PCA-136-156MHZ-5-Watt-Model-DTX-142-GCWD-I/191557457767?_trksid=p2047675.c100005.m1851&_trkparms=aid%3D222007%26algo%3DSIC.MBE%26ao%3D1%26asc%3D35389%26meid%3D4bbbffc700cc4aefba654c3ce0d394f8%26pid%3D100005%26rk%3D2%26rkt%3D6%26sd%3D401085025343
On 3/30/2016 12:11 PM, Skyler F wrote:
Factory tuned from the factory. And I don't even have a signal generator / counter good for RF. We got one hamtronics board, and won't buy another until we get this one working.
On Wed, Mar 30, 2016 at 10:08 AM, Joe Leikhim <rhyolite@leikhim.com> wrote:
Were these receivers factory built and tuned or did individual club members build them? Either way, you might try others from the lot. If you have only a rudimentary signal generator and / or frequency counter, perhaps I can walk you through some "field expedient" steps over the phone.
On 3/30/2016 12:01 PM, Skyler F wrote:
I don't have the test equipment to go through all of the dirty Local Oscilator, SINAD, etc., so I will have to wait on that a few weeks before the president of the club gets back in town.
WHEN I bypassed the capacitor and resistor ( 1k and .03µ) , the RTCM was able to calibrate squelch. The LED flashed several times and then was steady. Maybe the capacitor is the wrong value. There was no code on it, but based on the resistor code, the value was correct.
73Skyler
On Mon, Mar 28, 2016 at 4:08 PM, Joe Leikhim <rhyolite@leikhim.com> wrote:
If you are using an external reference, you cannot make up for the 2nd LO error if it is wildly off. There is an easy SINAD related test in EIA-603 that is called Offset Acceptance Bandwidth that would indicate if the IF were off center. Things that could go wrong apart from simple misalignment of the Quad Detector coil could include the LO crystal being way off frequency, the IF filters being wrong BW or off spec pass frequency.
Given the symptoms, I am putting my money on a misadjusted quad coil.
Joe
On 3/28/2016 5:06 PM, Bryan Fields wrote:
On 3/28/16 2:51 PM, Joe Leikhim wrote:
1) Make sure the receiver First Local Oscillator is adjusted correctlyThese are both very good points i didn't consider. I normally don't check my
on frequency. (Fo -10.700 MHz) Likewise the second LO should be at
around 10.2450 MHz. The second LO is not adjustable, so any minor error
would have to be made up with the TCXO U3. After this second step:
Then :
2) Make sure the general alignment is set properly, especially the
discriminator coil T2 which responds to 10.7000 MHz from a signal
generator, has an S curve response. In my experience with these sort of
Quadrature Detector chips, you can get a false sense of IF centering
where the noise component is suppressed. You might try adjusting for
maximum noise first without the 10.7000 MHz signal. Be careful you don't
jam the coil slug.
reference oscillators in the hamtronics as they are using an external 10MHz
source.
You will want to check SINAD on it as well, if it's not making spec (and those
hamtronics are very sensitive), something else is wrong with it.
--
Joe Leikhim
Leikhim and Associates
Communications Consultants
Oviedo, Florida
JLeikhim@Leikhim.com
407-982-0446
WWW.LEIKHIM.COM
_______________________________________________
App_rpt-users mailing list
App_rpt-users@ohnosec.org
http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
To unsubscribe from this list please visit http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.
--
-- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida JLeikhim@Leikhim.com 407-982-0446 WWW.LEIKHIM.COM
--
-- Joe Leikhim Leikhim and Associates Communications Consultants Oviedo, Florida JLeikhim@Leikhim.com 407-982-0446 WWW.LEIKHIM.COM--
_______________________________________________
App_rpt-users mailing list
App_rpt-users@ohnosec.org
http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users
To unsubscribe from this list please visit http://ohnosec.org/cgi-bin/mailman/listinfo/app_rpt-users and scroll down to the bottom of the page. Enter your email address and press the "Unsubscribe or edit options button"
You do not need a password to unsubscribe, you can do it via email confirmation. If you have trouble unsubscribing, please send a message to the list detailing the problem.