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Components and Circuits For discussions about component types, alternatives and availability, circuit configurations and modifications etc. Discussions here should be of a general nature and not about specific sets. |
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1st Jan 2020, 10:20 pm | #1 |
Nonode
Join Date: Dec 2012
Location: Stockport, Greater Manchester, UK.
Posts: 2,085
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Shower element for dummy load
I replaced the electric shower on Christmas Day, nothing wrong with it you understand, been working fine for 35 years but it looked a bit tired and I couldn't think of a sensible present for SWMBO so I had bought an absolutely super new shower. Anyway, while putting the old one in the bin I thought to extract the heater bit for examination and found it has two sections which are used in ||el for a nominal 7kW.
The sections are 20Ω and 15Ω respectively, which means it can be used as a load at either 35Ω (VSWR < 1.2 at 50Ω) or 8.6Ω for audio. Prolonged high-power operation might require some water flow I don't anticipate any requirement for a QRO load, if anyone is looking for such an item
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1st Jan 2020, 10:25 pm | #2 |
Dekatron
Join Date: Apr 2012
Location: Wiltshire, UK.
Posts: 13,951
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Re: Shower element for dummy load
For HF use I'd be worried that the capacitance between the inner heating-core and the outer metal sheath could mean it presented as something other than a purely resistive load.
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2nd Jan 2020, 10:09 am | #3 |
Nonode
Join Date: Nov 2015
Location: Welwyn Garden City, Hertfordshire, UK.
Posts: 2,013
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Re: Shower element for dummy load
Pure 35 Ohm resistive is not as good as 1.2:1 VSWR
Closer to 1.5:1 but with the inductance and capacitance present that is probably meaningless unless down at low frequencies. |
2nd Jan 2020, 11:00 am | #4 |
Hexode
Join Date: Dec 2018
Location: Sheffield, South Yorkshire, UK.
Posts: 364
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Re: Shower element for dummy load
what make is the old shower unit
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2nd Jan 2020, 11:21 am | #5 |
Nonode
Join Date: Dec 2012
Location: Stockport, Greater Manchester, UK.
Posts: 2,085
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Re: Shower element for dummy load
Sadia Heatrae. It originally had a touch switch but that failed and I replaced it with a very well insulated push switch
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