I made a previous thread before going over some of the problems I have
been having with my HF setup, using an ICOM 7100 as my rig, a Chameleon
EMCOMM II antenna which is an end-fed antenna, Diamond SWR meter, LDG
IT-100 tuner, and PowerWerx 30 AMP Desktop switching power supply.
A brief summary on the previous issue, which is related to the problem I am continuing to have:
The problem I was having before was that I was unable to make any
contacts on the 40 meter band or any other HF bands such as 20 meters. I
tested my radio with a few Hams I know, one of them was 60 miles away
from me and the other was 20 miles away. Both could not hear me
transmit even though I was in close proximity to them. I ended up
taking my radio to Ham Radio Outlet to have them check the radio. They
tested it on FM, 7.200 mhz and it was outputting 90-100 watts which they
said was perfectly normal. I was told from the guy at HRO that the
radio is working perfectly. I don't have any reason to not believe him,
as he was very knowledgeable and helpful. I was told that it since the
radio tested fine, it was probably either an antenna problem or I need
an amplifier to bring my radio over 100 watts output due to the hilly
terrain of living in Santa Clarita, California. I was told that out
here where I live it is a very typical problem to get a signal out in
the local area, and even though I may be able to make contacts 300 miles
way on SSB, locally it can be more difficult because of the terrain.
After going home and doing more tests, I called the same guy from HRO
and said that the SWR meter was only peaking around 20 watts to 40
watts. He said that this is normal for SSB, and since SSB is Peak
Envelope Power, the needle would only rise to around 20 watts or so.
This conflicts with what I was told from some other hams, who said that
their SWR meters constantly goes up and down to 100 watts when on SSB.
Next, I decided to buy an Alpha Antenna vertical to see if it was an
antenna problem. So after I was able to make contact with N7BFO Chuck
(he said I had a week signal and could hear me), who is 60 miles from
me, I bought a 20 foot flag pole and placed it at the top of my 40 foot
slope. Now after the end-fed antenna is up higher I can hear a lot more
stations and have less noise. I was able to make another contact with
N7BFO Chuck but this time being the first time with the end-fed antenna.
To much of our disappointment, Chuck could barely hear me and I could
hear him loud and clear. Chuck said that being so close to each others
stations he should be able to hear me a lot better.
I decided to make a video and put it on YouTube to show other Hams what
is going on and to get some advice. At this point, I don't think I am
outputting full 100 watts power on SSB, which does not make sense at
all. My RF output on the radio is at 100%, and I even changed the radio
to default settings just to be on the safe side. If the power is not
at 100 watts, it would make a lot of sense as to why I am having
difficulty making contacts. The height of my antenna should be good
enough now.
I have tried the following:
A) Raise my mic gain above 50% all the way up to 100%
B) Lower my mic gain
C) Change the ICOM 7100 radio to default settings
D) Turn speech compression on and off
E) Try a vertical antenna versus my end fed antenna
F) Check SWR levels
G) Connect antenna directly into radio and not using tuner
H) Disconnect SWR meter
I) Tried completely different coax cables
My questions are:
1): Is it normal for the SWR meter to only go up to 20 - 40 watts when transmitting on SSB when running on 100% RF power output?
2): Is it normal to have the Power Supply not go up to 17-18 AMPS when transmitting on SSB when running on 100% RF power output?
I took a look at the SWR meter after tuning and it is reading right
around 1, so I don't believe that the radio is being scaled down from
100 watts due to a high SWR.
I have been trying to make contacts by calling CQ, CQ, CQ, but no
responses yet. I am getting the feeling that my radio is not outputting
full power but since I have nothing to compare it to and getting
different responses from different HAM operators I don't know what to do
at this point. I think it would be a waste of money to get an
amplifier until I can confirm that my radio is outputting 100 watts
right now.
Here is the link to my video (was taken on iPhone) in my shack using the ICOM 7100 radio:
https://www.youtube.com/watch?v=IKDf...iT7AjDL7m4Fzlg
In the video, I show how when I change my radio to FM and transmit it
goes to around 18 AMPS on the power supply and 100 watts on the SWR
meter.
When I am on SSB 40 meters, and transmit, the power supply peaks at 12
amps but usually stays around 7-8 AMPS, and the SWR meter peaks around
20 watts.
Steve who is WB2WIK has been very helpful and I wanted to post this to
get some different ideas, and of course including Steve's input! I am
no expert, but I don't think this is an SWR problem is there a setting
in the radio I don't know about? It seems like the radio is limiting
the output to 20-40 watts maximum on SSB.
2 comments:
.
Thanks for your comments, Comments may take a day to show up
Amateur Radio Users Support Group
https://groups.io/g/AmateurRadio
ICOM IC7300 IC-7300 SDR Transceiver
icom7300@groups.io
https://groups.io/g/icom7300
Icom 7610 Transceiver
Icom7610@groups.io
https://groups.io/g/Icom7610
.
Note: only a member of this blog may post a comment.
Subscribe to:
Post Comments (Atom)
I think when talking in the mic the meter would read about what you have, if you give agood whistle in the mic it should go up to 100 watts....and a 100 watt radio should use 18 to 20 watts on full power....Fred in England
ReplyDeleteSeveral videos on u tube that shows very precise measurements and the "fix" for low output on ssb Icom 7100 radios..Check them out..they work!! Otherwise, send to repair shop and pay $100..
ReplyDelete