Very interesting about your TW1.
I wonder how those meters are calibrated to begin with?
Tom Behler: KB8TYJ
----- Original Message -----
From: "Steve Forst" <[log in to unmask]>
To: <[log in to unmask]>
Sent: Thursday, December 13, 2012 1:12 PM
Subject: Re: Accuracy of TW1 Talking SWR/Watt Meter
> Tom,
>
> I always find the TW-1 to read low on power and sometimes (not always) a
> few ticks higher on SWR. I am comparing this to readings I get from a
> Wave-Node unit, which has some audio feedback, and the meters on my amps
> and external tuners. The meters in the amps and tuners need sighted
> help, which I usually don't have here. When I did have sighted help, I
> found that no matter what combo of radio, amp, and tuner, these meters
> always matched or were very close to what I was seeing from the
> Wave-Node. The TW-1 is always the odd man out.
>
> This discrepancy increases with power and frequency. Less of a
> difference on 160, more on 10 meters.
>
> The tones seem to work well in the TW-1. If I tune for flat SWR with
> the tone, All meters will show 1.0:1 with the possible exception of the
> TW-1 which may show as much as 1.5:1 depending on band or antenna.
> Same with power tone. If I tune for highest pitch, all meters will show
> max power, but the voice of the TW-1 will always read lower than the
> others. Sometimes more than 100 watts difference, while the others are
> all pretty close to each other.
>
> My TW-1 may be out of specs compared to what others have, or maybe it is
> correct and everything else here is wrong. As someone said, it's just a
> hobby.
>
> 73, Steve KW3A
>
>
> On 12/13/2012 6:57 AM, Tom Behler wrote:
>> Hey, all.
>>
>> As I have addressed my most recent issue with the TS590 DC power cable, I
>> have noticed something interesting with my TW1 swr/watt meter.
>>
>> Actually, I thought I already knew this, but my most recent readings have
>> reminded me of the issue.
>>
>> Now, with both of my TS590 power cables, when the rig is set to 100 watts
>> output, I consistently get 100 watts as a power reading on the TS590's
>> internal meter.
>>
>> However, when using the LDG TW1 talking watt meter, my readings can vary
>> anywhere from 85 to 91 watts, with occasional dips as low as 81 watts.
>>
>> Keep in mind that all of these readings are taken on a resonant frequency
>> with my Alpha Delta DXCC antenna and an SWR of 1.0 to 1. Also, I get the
>> same reading variations with the TW1 when using a dummy load.
>>
>> I checked the TW1 manual, and they clame an accuracy of plus or minus 5
>> percent on 14 mhz, but I think that is debatable.
>>
>> On the other hand, do we know how accurate the TS590's power meter is as
>> well?
>>
>> I'm not one to quibble over 10 or 15 watts, but I find the inconsistent
>> readings with the TW1 to be at least interesting.
>>
>> 73 from Tom Behler: KB8TYJ
>>
>>
>>
>
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