[TenTec] Model 238C Tuner Questions

Steve Hunt steve at karinya.net
Tue Oct 16 10:22:16 EDT 2012

Even measuring the load impedance wont immediately tell you what are the 
best settings, for a couple of reasons:

1) The HiZ / LoZ labelling is a misnomer for an L-network tuner; for 
example, for a load of 10+j20 Ohms you would need the HiZ setting.
2) On the HiZ1 and LoZ1 settings, the 238 is not a simple L-match; 
compensating components are switched in to overcome the strays and the 
network becomes either a low-pass T-network or a low-pass Pi-network.

Steve G3TXQ

On 16/10/2012 12:19, Richards wrote:
> I wonder if there is a simple way to use my RigExperts AA-230 antenna 
> analyzer to determine if the antenna has high or low impedance so it 
> would be easier to determine, in advance, which High-z or Low-z 
> setting to start out with or to confirm my selection and best guess as 
> to which works best ?

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