• 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.

Low-band NMO VHF-High performance?

Anderegg

Enter text in this field
Premium Subscriber
Joined
Mar 7, 2010
Messages
2,343
Location
San Diego
NMO36, tuned for 40MHz CHP. Puting together a new car, and would like to install a QMA Motorola Multiplexer I have, and use my low-band antenna dual purpose for VHF-High. What type of performance could be expected from a low-band whip on 155MHz vs a triband Laird or Larsen small antenna. The local VHF channels do not talk enough to allow comparison testing.

Paul
 

markclark

Member
Premium Subscriber
Joined
Oct 30, 2004
Messages
353
Location
Nevada Territory
The VHF High signal killer is the Low Band coil that is nowhere near the resonance needed for High Band performance. I know this from personal experience. Try to install a diplexer and run two antennas.

Good luck.
 

Anderegg

Enter text in this field
Premium Subscriber
Joined
Mar 7, 2010
Messages
2,343
Location
San Diego
For RX only obviously, would it be worse than a tri-band NMO150/450/7800 antenna? VHF is so hard to test in my county, as it only lights up once in a blue moon, and when it does, it is always horrible signal strength at best.

Paul
 

prcguy

Member
Joined
Jun 30, 2006
Messages
10,985
Location
So Cal - Richardson, TX - Tewksbury, MA
Yup, running a base load antenna 3X lower than the operating frequency doesn't work very well. You should get better results using a VHF 5/8 wave like a Larsen or Maxrad tuned to 155 then it will operate as a 1/4 wave tuned to 51.6MHz. Not perfect but should be useable for CHP.
 

petnrdx

Member
Joined
Feb 5, 2004
Messages
266
Location
Sparks, NV
As PRCguy says, you REALLY want to go the other way around. I know from experience that the Lo Band antenna is deaf as post
at VHF Hi. If your 42 mhz antenna is RX only then get an NMO-150 and use it for both. Will work well. If your Lo Band antenna
needs to be for TX also, then you will need two antennas.
 

merlin

Active Member
Joined
Jul 3, 2003
Messages
527
Location
South East Idaho
The low band antenna will resonate near your target frequency, at least enough to stay under 2:1 match.
Not much option going back and fourth between bands.
Use strictly for 155, you can use an outboard coil and small cap to 'tune' the antenna.
Best bet is something like Maxrad, Larson, or Browning 5/8 wave 150.
I tried the 6 meter antenna on 2 meter and neither band had optimal performance. I went with the Browning 5/8 wave AND the Sigma SE-HF-X80 tuned 5/8 wave at 52 Mhz.
 
Top