there is a mod out for th ekenwood ts2000 that brings the sensitivity up and does not raise the noise figure I have the info if anyone is interested but it requires someoen who can tack some resistors onto the smd board at the front end basically kenwood didn'tbother to send the correct voltage to the front end and the mod fixes that it's beenincorportated in the latest tsk rigs sold in the last year or a bti more from what I have been told I have not found anyone to do the mod here unfortunately I also need to replace the rotary channel encoder the one just above the volume controls cause it's starting to act up 73 b7nla
On Jan 26, 2011, at 1:41 PM, colin McDonald wrote:
> I know on HF and LW frequencies, space is obviously an issue and that's why
> this antenna is desireable.
> However, would this antenna be better than say a discone, or even a quarter
> wave vertical on frequencies above 100MHZ?
> One has to wonder.
> I mean, if this thing can pull signals out on the VHF band that would be
> unreadable with a quarter wave or 5/8's wave, then definitely worth the
> investment I think.
> For a scanner or wide band receiver anyway.
> I find most preamps merely increase the noise level of the noise floor, and
> don't do anything to actually increase the quality of the signal. Sort of
> like having an extra volume control that introduces other unwanted variables
> into the signal path.
> Yes, it'll make the S meter go up, but that is a factor of the entire noise
> floor being raised up including the faint signal.
> Perhaps I've never used a really good preamp, but if I hear a signal, then
> turn on the preamp, I don't hear the signal any better than before, just
> louder audio.
> even in radios like the ts2000, the preamp seems to just increase the noise
> floor and boost up the signals audio and not the actual signal itself.
> Perhaps they make preamps now that focus on digging the signal out and
> amplifying what you want to hear instead of everything around it.
> 73
> Colin, V A6BKX
> ----- Original Message -----
> From: "Martin McCormick" <[log in to unmask]>
> To: <[log in to unmask]>
> Sent: Wednesday, January 26, 2011 9:35 AM
> Subject: Re: Really Big Transmitters
>
>
>> Maybe we should change the subject line to Really Little
>> Antennas. I don't know anything about that particular antenna,
>> but amplified or active antennas have been around for a while
>> and keep getting better mainly due to FET amplifiers with lower
>> and lower noise figures.
>>
>> The only down side to an antenna like this is that when
>> you use it indoors, it is going to pick up all the crud from all
>> the gear you are running so you will have an even better way of
>> listening to your switching power supply, that little switching
>> circuit that makes compact fluorescent lamps go and lots of
>> other hash generators.
>>
>> Also, if you live near a very powerful AM or FM radio
>> station, you might discover that the powerful transmitter
>> overloads the preamp in the antenna which could cause you grief
>> by creating lots of mixing products far away from the frequency
>> you are trying to hear.
>>
>> If you have a relatively quiet location, this antenna is
>> probably fine.
>>
>> It sounds kind of interesting so let us know if you get
>> one and listen through it.
>> Russ Kiehne writes:
>>> The reason I ask, do you know anything about the following antenna?
>>> The AOR LA390
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