• To anyone looking to acquire commercial radio programming software:

    Please do not make requests for copies of radio programming software which is sold (or was sold) by the manufacturer for any monetary value. All requests will be deleted and a forum infraction issued. Making a request such as this is attempting to engage in software piracy and this forum cannot be involved or associated with this activity. The same goes for any private transaction via Private Message. Even if you attempt to engage in this activity in PM's we will still enforce the forum rules. Your PM's are not private and the administration has the right to read them if there's a hint to criminal activity.

    If you are having trouble legally obtaining software please state so. We do not want any hurt feelings when your vague post is mistaken for a free request. It is YOUR responsibility to properly word your request.

    To obtain Motorola software see the Sticky in the Motorola forum.

    The various other vendors often permit their dealers to sell the software online (i.e., Kenwood). Please use Google or some other search engine to find a dealer that sells the software. Typically each series or individual radio requires its own software package. Often the Kenwood software is less than $100 so don't be a cheapskate; just purchase it.

    For M/A Com/Harris/GE, etc: there are two software packages that program all current and past radios. One package is for conventional programming and the other for trunked programming. The trunked package is in upwards of $2,500. The conventional package is more reasonable though is still several hundred dollars. The benefit is you do not need multiple versions for each radio (unlike Motorola).

    This is a large and very visible forum. We cannot jeopardize the ability to provide the RadioReference services by allowing this activity to occur. Please respect this.

Antenna Tuning

Status
Not open for further replies.

jimbr1

Member
Joined
Sep 9, 2007
Messages
51
I have a question about antenna tuning. I'm using a small tunable whip antenna. When tuning, I can get as low as about 1.2 to 1. If I tune it low for channel 19 or 20, by the time I get to channel 1 or 40, the SWR is a little over 3 to 1. My question is, if I use an antenna matcher, will it lower BOTH high SWR ends simultaneously (channel 1 and 40) or just one end, either channel 1 or 40? If I need to re-tune it when I change channels, could I just tune the antenna itself for the high or low end (say lowest SWR on channel 40) and use the matcher to tune for lowest SWR on channel 1? I'm just looking for information from personal experiences as I have done research which so far has not really answered my questions as I am not looking for antenna recommendations, only tuning experiences. Any info would be appreciated.
Cheers
 

WouffHong

Member
Joined
Oct 11, 2005
Messages
308
Location
Jawjuh :)
Swr

I if I use an antenna matcher, will it lower BOTH high SWR ends simultaneously (channel 1 and 40) .
Cheers
Negative - each extreme will require retuning as you have probably noticed. The reactance of the antenna will change as you move from Ch1 to Ch 40 and require retuning at points that are over, say, 1.5-2.0 SWR
Da Wouff
 

jimbr1

Member
Joined
Sep 9, 2007
Messages
51
I was hoping for a bit of magic...now back to reality....thanks for the info...
Jim
 

JayMojave

Member
Joined
Dec 13, 2007
Messages
688
Location
Mojave Ca
Hello Jimbr1:

Don't sweat the SWR there, those short antennas will have a narrow SWR bandwidth. The radio will work just fine with those higher SWR's at the band edges. Is not a problem GI!

Jay in the Mojave
 

sloop

Member
Joined
Jul 19, 2008
Messages
249
Location
Millers Creek, NC
Ant. Tuning

Jimbr1...I agree, don't sweat the high SWR at the band edges. Tune your antenna with ch 19 (freq. wise it in the middle of the 40 chs.). You should not see much SWR difference across the chs.
 

rfking123

Member
Premium Subscriber
Joined
Jun 18, 2008
Messages
107
Location
Syracuse, New York
I have a question about antenna tuning. I'm using a small tunable whip antenna. When tuning, I can get as low as about 1.2 to 1. If I tune it low for channel 19 or 20, by the time I get to channel 1 or 40, the SWR is a little over 3 to 1. My question is, if I use an antenna matcher, will it lower BOTH high SWR ends simultaneously (channel 1 and 40) or just one end, either channel 1 or 40? If I need to re-tune it when I change channels, could I just tune the antenna itself for the high or low end (say lowest SWR on channel 40) and use the matcher to tune for lowest SWR on channel 1? I'm just looking for information from personal experiences as I have done research which so far has not really answered my questions as I am not looking for antenna recommendations, only tuning experiences. Any info would be appreciated.
Cheers
A rule of thumb for you. The higher the frequency, the shorter the antenna. CB channel 1 is: 26.965; CB channel 40 is 27.405. A difference of 1.440 Mhz. If you trim back too much channel 1 may jump in SWR, and visa verse. It is always a compromise but if you tune very carefully, you can get a good SWR for both channels 1, and 40. It is a "knack," without having to resort to tuners, and cutting.
 

jimbr1

Member
Joined
Sep 9, 2007
Messages
51
Thanks for the replies- the antenna I'm using is a small whip outside on a metal air conditioner housing. It is easily tuned but very narrow as describe previously. My only other option is an indoor dipole- may have a better match across 11 meters but, being inside- I don't think it will perform as well as an outdoor antenna- even a small one.
 
Status
Not open for further replies.
Top