Yes, but the 70 is a 50 watt radio, that is where I was confused.
On Sun,
8 Jan 2012, David W Wood (G3YXX) wrote:
> Wrong ...
>
> If it is a 100 watt output, it won't be 100 per cent efficient, so you =
> have to make assumptions about its efficiency.
> A typical class c would be about 60 per cent, hence 160 watts draw.
> Assuming 13.8 efficiency, then using ohms law gives you the current =
> draw.
>
> 73
>
>
>
> David W Wood
>
> Ham call - G3YXX
> FOC # - 1685
> Licensed - 1969
> =20
>
> -----Original Message-----
> From: For blind ham radio operators =
> [mailto:[log in to unmask]] On Behalf Of Butch Bussen
> Sent: Sunday, January 08, 2012 7:25 PM
> To: [log in to unmask]
> Subject: Re: anyone know what the current draw is for TMV7A on high =
> power?
>
> Where do you get the 100 watts? I'm a little confused or perhaps I need =
>
> a nap. at 50 percent, a 50 watt radio would pull 100 watts, divided by=20
> 12v is 8 amps, or are you thinking a hundred watt radio?
> 73
> Butch
> WA0VJR
> Node 3148
> Wallace, ks.
>
>
> On Sun, 8 Jan=20
> 2012, David W Wood (G3YXX) wrote:
>
>> If it was 50 per cent efficient, at 100 watts, then about 15 amps.
>> If, say, class C at two thirds efficiency, then about 11 amps.
>>
>> 73
>>
>> David W Wood
>>
>> Ham call - G3YXX
>> FOC # - 1685
>> Licensed - 1969
>> =3D20
>>
>> -----Original Message-----
>> From: For blind ham radio operators =3D
>> [mailto:[log in to unmask]] On Behalf Of Tom Behler
>> Sent: Sunday, January 08, 2012 3:37 PM
>> To: [log in to unmask]
>> Subject: anyone know what the current draw is for TMV7A on high power?
>>
>> Hi, all.
>>
>> Does anyone know what the old Kenwood TMV7A draws in terms of amperage =
> =3D
>> when=3D20
>> transmitting on high power?
>>
>> I looked on icanworkthisthing.com, but the manual there omits the=3D20
>> specifications section.
>>
>> I would suspect the current draw on high power is about 12 or 13 amps, =
> =3D
>> but=3D20
>> am not totally sure.
>>
>> I'm getting packet radio set up here, and am trying to decide whether =
> I =3D
>> can=3D20
>> use the 7A for packet with my RS35 power supply, and the rigrunner, =
> or=3D20
>> whether I need to give the old 7A it's own separate power supply.
>>
>> Currently, my rig runner and Astron RS35 powers my TS590 and my =
> TMV71A, =3D
>> plus=3D20
>> a few accessories, but obviously, everything is not operating at the =
> =3D
>> same=3D20
>> time.
>>
>> 73 from Tom Behler: KB8TYJ
>>
>>
>> --
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