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Toptek PA-85V VHF amplifier

 

Has anyone used this amplifier for the VHF side of their IC-7000?
Have reached my height limit for my antenna, am hitting the repeater I need but there is noise on my signal. Was hoping 85 watts would help.
Thanks?
Martha
K1VJ
 

Have used?mine for a good number of years.

you don,t?say what antenna you're using.

I use a 10 element yagi?vertically polarised.

73 colin vk3zzs


On Mon, Mar 24, 2025 at 7:57?AM Martha Pummer via <vmpummer=[email protected]> wrote:
Has anyone used this amplifier for the VHF side of their IC-7000?
Have reached my height limit for my antenna, am hitting the repeater I need but there is noise on my signal. Was hoping 85 watts would help.
Thanks?
Martha
K1VJ
 

Note the radio is rated 50W,? moving up to 85W is a very marginal increase
and one I'd not persue.? ?Basically if you don't double your power its not worth
the effort.? I assume you using low loss cable (rg213 or better say lmr400) as
cable loss at 2m has an impact.? RG8X is ok for short runs (less than 25ft).
?
I use a small 30W amp for my Ft817 as 5W to 30w is a substantial increase.
?
I use an amp with mine... Not toptek but generally they are all the similar.
-? First TX power must be set to not damage the amplifier input.
? ?For my amp that is about 7W.
-? You need whatever cable? your amp uses to signal TX active, and also
? ? matches the IC7000 (the accessory jack).
- coaxial cables (obvious I know).
- power supply for the amp and the radio with 12A of additional current
? ?capability.
?
My experience and usage is that more antenna is cheaper than an amp
and it helps wth RX as well.? A small 4 element yagi for 2M aimed in the
desired direction will be far more effective than upping the power to 85W.
?
--
Allison
 

2.3dB extra will not even move the S meter, say at 50 Watts

73

Andrew

Get
On 26 Mar 2025, at 13:27, "ajparent1/kb1gmx via " <arrl.net@groups.io target=_blank>[email protected]> wrote:

Note the radio is rated 50W,? moving up to 85W is a very marginal increase
and one I'd not persue.? ?Basically if you don't double your power its not worth
the effort.? I assume you using low loss cable (rg213 or better say lmr400) as
cable loss at 2m has an impact.? RG8X is ok for short runs (less than 25ft).
?
I use a small 30W amp for my Ft817 as 5W to 30w is a substantial increase.
?
I use an amp with mine... Not toptek but generally they are all the similar.
-? First TX power must be set to not damage the amplifier input.
? ?For my amp that is about 7W.
-? You need whatever cable? your amp uses to signal TX active, and also
? ? matches the IC7000 (the accessory jack).
- coaxial cables (obvious I know).
- power supply for the amp and the radio with 12A of additional current
? ?capability.
?
My experience and usage is that more antenna is cheaper than an amp
and it helps wth RX as well.? A small 4 element yagi for 2M aimed in the
desired direction will be far more effective than upping the power to 85W.
?
--
Allison

 

开云体育

Exactly. 1 S unit is 6dB.
KC9C

-------- Original message --------
From: "Andrew Lenton via groups.io" <a@...>
Date: 3/26/25 1:12 PM (GMT-08:00)
Subject: Re: [ic7000] Toptek PA-85V VHF amplifier

2.3dB extra will not even move the S meter, say at 50 Watts

73

Andrew

Get
On 26 Mar 2025, at 13:27, "ajparent1/kb1gmx via " <arrl.net@groups.io target=_blank>[email protected]> wrote:
Note the radio is rated 50W,? moving up to 85W is a very marginal increase
and one I'd not persue.? ?Basically if you don't double your power its not worth
the effort.? I assume you using low loss cable (rg213 or better say lmr400) as
cable loss at 2m has an impact.? RG8X is ok for short runs (less than 25ft).
?
I use a small 30W amp for my Ft817 as 5W to 30w is a substantial increase.
?
I use an amp with mine... Not toptek but generally they are all the similar.
-? First TX power must be set to not damage the amplifier input.
? ?For my amp that is about 7W.
-? You need whatever cable? your amp uses to signal TX active, and also
? ? matches the IC7000 (the accessory jack).
- coaxial cables (obvious I know).
- power supply for the amp and the radio with 12A of additional current
? ?capability.
?
My experience and usage is that more antenna is cheaper than an amp
and it helps wth RX as well.? A small 4 element yagi for 2M aimed in the
desired direction will be far more effective than upping the power to 85W.
?
--
Allison

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