Elk Antennas 2m/70cm portable log-periodic dipole
Posted: Fri Feb 19, 2010 2:29 pm
I've had nothing but trouble trying to get on Keller from out in Twentynine Palms. At first, I figured this was just due to my limited equipment (a HT with the stock rubber ducky when I started out) and had all but accepted the fact that I would either have to drive up the mountain, or live with EchoLink delays and drops (which are really bad on Time Warner's horrible service in this area). Later, after getting a decent mobile radio and antenna set up in the wife's truck (and verifying it was installed right by testing on simplex), I realized equipment might not be the whole problem after all. I did several trial runs by sitting on EchoLink to verify there was, in fact, traffic and listening in on the mobile with the squelch turned off - still nothing but sleep-inducing white noise (not even garbled static).
I mentioned this to DaveK before one of the Nets, and with his help was able to get this elevation profile:
So, I'm just over 55 miles from the Keller Peak repeater... and half of that distance is through solid rock. 
Enter the Elk
On Dave's recommendation I ordered an Elk Antennas 2-meter/70-cm antenna, along with their carry bag since I figured this would end up becoming part of my standard kit in the truck. The antenna packs down small in the bag (about 24 x 6 x 1.5 inches) and is very light and easy to assemble. All of the individual rods are color-coded so there is no confusion getting them in the right order, and everything goes together without tools. The mount fits snug onto 1-inch PVC conduit readily available at any hardware store, which I have since cut to the length of my roof rack for easy transport.
I was able to test it out for the first time during last night's Net, under less than ideal conditions (mostly my fault), and I am very impressed. On the receiving end it sounded as if the repeater was next door, it was like being on EchoLink only without the random lags and drops. I had to transmit on high power to reach the repeater with a useable signal, but it was still scratchy (I have not heard the recording yet). Still, most of my transmission troubles are probably due to my hastily assembled "pile of firewood and a ratchet strap" mounting bracket, only roughly knowing what direction the repeater was in, using the only very poor coax I had on hand, and strong winds blowing the entire assembly around.
Keller is behind the mountains in the distance on the right.
I think with a proper mount and an accurate bearing from here to the repeater I'll be in business. I also think I'm going to order a second Elk to leave in the wife's truck - something so useful and so easy to carry, it almost seems silly to be traveling the back country without it.
I mentioned this to DaveK before one of the Nets, and with his help was able to get this elevation profile:
- tnp-to-keller-profile.JPG (55.43 KiB) Viewed 8928 times
Enter the Elk
On Dave's recommendation I ordered an Elk Antennas 2-meter/70-cm antenna, along with their carry bag since I figured this would end up becoming part of my standard kit in the truck. The antenna packs down small in the bag (about 24 x 6 x 1.5 inches) and is very light and easy to assemble. All of the individual rods are color-coded so there is no confusion getting them in the right order, and everything goes together without tools. The mount fits snug onto 1-inch PVC conduit readily available at any hardware store, which I have since cut to the length of my roof rack for easy transport.
I was able to test it out for the first time during last night's Net, under less than ideal conditions (mostly my fault), and I am very impressed. On the receiving end it sounded as if the repeater was next door, it was like being on EchoLink only without the random lags and drops. I had to transmit on high power to reach the repeater with a useable signal, but it was still scratchy (I have not heard the recording yet). Still, most of my transmission troubles are probably due to my hastily assembled "pile of firewood and a ratchet strap" mounting bracket, only roughly knowing what direction the repeater was in, using the only very poor coax I had on hand, and strong winds blowing the entire assembly around.
Keller is behind the mountains in the distance on the right.
I think with a proper mount and an accurate bearing from here to the repeater I'll be in business. I also think I'm going to order a second Elk to leave in the wife's truck - something so useful and so easy to carry, it almost seems silly to be traveling the back country without it.