Kurt wrote:

Well, I had set the program to optimize the antenna for 433Mhz
as that is what I was going to start with on my tracking transmitter.
Plugged the Yagi into my handheld, set the power to low, set the fwd
indication on my SWR meter and then did the ref reading. I was shocked
to see that it was 1:1.2. Set it up to 450Mhz and saw it was 1:1. For
this new ham, it was pretty surprising for a first project.

This is exactly why I never trusted gamma matches on 70 cm. I consistently
got nearly perfectly flat matches all the way across the band using a gamma
match. This usally something aint right. and the antenna is probably
radiating more in the infra-red region than at the desire frequency. No
doubt there are others more skilled than I who can make it work For me the
quagi has worked to damned well for me to bother.

Jimmie.

Jimmie D wrote:
Kurt wrote:

Well, I had set the program to optimize the antenna for 433Mhz
as that is what I was going to start with on my tracking transmitter.
Plugged the Yagi into my handheld, set the power to low, set the fwd
indication on my SWR meter and then did the ref reading. I was shocked
to see that it was 1:1.2. Set it up to 450Mhz and saw it was 1:1. For
this new ham, it was pretty surprising for a first project.

This is exactly why I never trusted gamma matches on 70 cm. I consistently
got nearly perfectly flat matches all the way across the band using a gamma
match. This usally something aint right. and the antenna is probably
radiating more in the infra-red region than at the desire frequency. No
doubt there are others more skilled than I who can make it work For me the
quagi has worked to damned well for me to bother.

Jimmie.


Thanks for the info Jimmie. I gotta find a 70cm repeater in a
reasonable range and see if I can get some signal reports. As
mentioned, I was tentatively going to use this for RDF so in actuality
I could just connect it to a handheld scanner. I was told though if an
antenna demonstrated a good SWR on transmitting it should be good for
receiving. Sounds like that may not be the truth though judging by your
experience.

Kurt

"Kurt" wrote in message
...
Jimmie D wrote:
Kurt wrote:

Well, I had set the program to optimize the antenna for 433Mhz
as that is what I was going to start with on my tracking transmitter.
Plugged the Yagi into my handheld, set the power to low, set the fwd
indication on my SWR meter and then did the ref reading. I was shocked
to see that it was 1:1.2. Set it up to 450Mhz and saw it was 1:1. For
this new ham, it was pretty surprising for a first project.

This is exactly why I never trusted gamma matches on 70 cm. I
consistently got nearly perfectly flat matches all the way across the
band using a gamma match. This usally something aint right. and the
antenna is probably radiating more in the infra-red region than at the
desire frequency. No doubt there are others more skilled than I who can
make it work For me the quagi has worked to damned well for me to bother.

Jimmie.
Thanks for the info Jimmie. I gotta find a 70cm repeater in a reasonable
range and see if I can get some signal reports. As mentioned, I was
tentatively going to use this for RDF so in actuality
I could just connect it to a handheld scanner. I was told though if an
antenna demonstrated a good SWR on transmitting it should be good for
receiving. Sounds like that may not be the truth though judging by your
experience.

Kurt

Hi Kurt

The local repeater is a good source of a test signal, as you indicate.
In addition, have you considered looking for an amateur satellite on 435MHz?
AMSAT has alot of satellite pass prediction information.

Jerry