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Everything posted by jparisse

  1. DZL TX takes 5v which you can get from your RC RX. The GPS connects to the lower of two connector (connectors to the left) with just GND and TX lines (black and yellow). Jeff
  2. Thomas... You are like the Shaolin Priest from the old Kung Fu movies! Totally wise but cryptic to your followers! I have two sentences setup: GGA and RMC each at 1Hz so the data seems continuous to this human processor. I understand about the pauses but don't understand how one can program the GPS unit to produce them... Should I just lengthen the pause time between the sentences I am currently using (say 2 or 3Hz)? Is it that easy? Thanks for teaching me so much. Someday I hope to snatch the pebble from your hand... Jeff Mark... That is VERY cool and about time (ask 'em to m
  3. I'm getting busy at work and can not participate in the OSD Beta program. If anybody wants my Beta unit, PM me. $10 to cover postage is all I want. Jeff Edit - Sold to a US based NTSC user with AVR programming tools and knowledge.
  4. The modem is probably perfect but the audio fidelity (antique word) of the 650mW Lawmate TX is not so good... I flew a test today with the DZL Modem and above mentioned Lawmate TX. I should point out that I have messed with the audio pot on the TX so much that the screw driver slot is worn down. I think this pot is for impedance matching but on some TXs (as Mr. RC-CAM points out) is a carrier frequency adjustment for the audio channel. In either way, I used it to maximize the performance with a TinyTrac3 and, later, with the DZL Modem (less so). The “non-factory” setting of this pot may ske
  5. Testing with Airwave I finished assembling a 633 TX and 634 RX from Airwave and tested the DZL Modem with them. Video looked clear and very much like the Lawmate product. The difference (as Thomas has already pointed out) is in the quality of the audio link(s). The square wave looked almost identical to Thomas’ screen shots and the TX tolerated a much wider range of pot settings. I added a .01uf, .1uf and 1uf filter cap just to see/hear if I could detect any difference or benefit. Maybe in a harsher airborne RF environment a filter cap could ground out LF but on the bench, I couldn’t see
  6. Taz and Beta Team... The schematic and construction photos can be found on this thread. I wanted to keep everything here during the testing phase so we could all research this together. Thanks Gil... yeah, I love those plastic toolboxes from Stanley Tools! Jeff
  7. Thanks. It is sold as PCB repair copper by DATAK (LKG Industries). I usually line the inside of my RF boxes but this 633 and it's VReg get hot so I felt the surface area of the copper would help to keep things cool (plus I put my TXs out in the wind anyway). Jeff
  8. I run Google Earth Plus at home to survey the flying field and to cache the data so that when I'm away from the Internet the maps are still available. I use a laptop for telemetry and one of those portable 7" DVD players that are also dirt cheap on EBay for video and OSD data. I setup my gear inside the rear hatch of my car. My current ship: http://www.rcgroups.com/forums/showthread.php?t=631757 Jeff
  9. Right now I'm using Google Earth Plus... Jeff
  10. I followed Thomas and Mark's lead and soldered all the components including a VReg to the 633 and put it into a box. I used a 5c wire w/shield and copper RF foil. It works! Jeff
  11. 40EUR=$54 about the same as a full DZL Beta kit with case, PCBs and all the parts. You're right, Gil... A bargan! Jeff
  12. Actually Gil, we are only interested in the set-up into which you have installed the DZL modem. This thread is for DZL users who wish to share information on the DZL modem and how it integrated into their plane. I bet most folks on RC-CAM have planes with cameras in 'em. I must reason that the DZL Modem works perfectly for you without any modifications. Great... so far 100% success. Jeff
  13. Just to put some numbers to it... at 5.5V the NTE1904 rose to 108.5F (42.5C) in three minutes. I didn't push it past that. That should be OK with a heatsink and perhaps outside of the fuselage. I was hoping to design a PCB without a heatsink and keep it exposed to air (relying on the AWM633 to self cool). If I mount the VReg upside-down, it can be folded over and attached to a piece of brass or aluminum that is laid across the top of the AWM633. Sort of like a heatsink sandwich (heatsink, component space, PCB). The heatsink only adds the option to use 5.5V rather than a single LiPoly
  14. I'm attempting to power the Airwave 633 TXs at 3.3V and RFI on switchers bugs me too. So I'm thinking of using a LDO linear regulator on a low input voltage instead. As a test, I dropped a 640mA load across a NTE1904 3.3V Linear LDO Regulator and powered it with a single cell LiPoly (4.2V fully charged). The NTE1904 was mounted vertically (stuck in a breadboard) without a heatsink. I took temperature measurements at 5-minute intervals with a Fluke 61 IR Thermometer at 2". Room temperature was 70F and the air was static. After 10 minutes the chip leveled off at 81.5F (11.5F over ambient) and
  15. Gil, Can you share your setup details for the good of the group? Did you use a filter cap on the receiver? What component values did you use? What brand of Video TX/RX are you using? I just finished installing the last of the Beta modems into my UAV and ground testing. I'm not using a filter cap in the RX and I'm using the standard component values of the kit. I have a Black Widow AV setup (Lawmate) with a 600mW 2.4GHz TX and a simple standard RX (I'll use my high gain diversity system when I flight test). The video is clear and the telemetry seems rock solid. When the morning fog con
  16. The six Beta DZL Modems have been shipped. I'll post some photos to aid construction here. Let the Beta testing begin! Jeff
  17. Thomas wrote: "the square wave from the DZL encoder must be filtered right"... This part has me a little ... What is the goal of the filter cap? Is it to reduce low frequency noise (high-pass) or to shape the square wave to a triangle (integrator)? My setup had the best results without any filter cap at all. I reason that whatever circuitry on the receiving end of my Video Transmitter is shaping the square wave to resemble the scope traces I uploaded to the DZL thread. All I had to do on the DZL TX side was adjust my output level to get it to work (100k pot to ground, wiper out).
  18. Connector Examples - Once the TX is setup (jumper and pot) one can package the whole thing in 3/4" shrinkwrap.
  19. OK Guys, the first batch of Beta DZL Modems has shipped to Hartwig, Wavess and qnzkrew via airmail. International postage cost $6.33 and domestic was less than $2.00. So, the new shipping terms will be $7.00 International and $2.00 U.S.. The TX has standard .1” pin headers for Power and GPS in. One can use a JST, servo or other connector that has.1” pin spacing. The output is a shielded cable terminated with an RCA phono plug. There is a jumper to select inverted or non-inverted output and I’ve left a space for a filter cap should one determine if a filter cap is necessary (one of the prima
  20. USB to Serial... I use a Belkin brand USB to serial converter with my DZL modem and it works fine as should all similar products. Jeff
  21. Mark wrote: "Postage should be no more than $5 to Australia via USPS airmail btw" I used the USPS postage rate finder on the web and I couldn't get the price below $17 to Perth so I'm shipping at a loss*. Can you send a link on how to find a better rate? To All, Yes, once the Beta testers have confirmed their orders, either Mark Harris or I (or perhaps both) will offer the kit for sale to the general public. The consumer price will be slightly higher than the Beta Testing price but the kit form will help make this affordable to everyone. If any Beta tested back out, I will offer remai
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