Archive for the ‘OHR Kits’ Category

What is the Minimum power ouptut from an OHR 100A?

Friday, May 30th, 2014

Just curious what the MINIMUM output of a 40 meter OHR-100A is with the pot turned all the way down. I can’t find that info anywhere online. I realize it may vary from radio to radio. Would you expect
it to key properly at minimum power?

The minimum power is 0.00W and it does not depend on the band. On all OHR 100A transceivers, the
power output is continuously variable from zero to full power. The power control is actually the bias on the driver, so the transmitter will key properly regardless of output power setting. The power output control is a 100 ohm trim pot accessible from the rear of the radio. Full power is at minimum resistance on the emitter of the driver transistor.

Will the OHR DD-1 Digital Dial work with my radio?

Wednesday, April 4th, 2007

We do not directly support the OHR DD-1 as a digital dial for radios other than OHR, but in practice it can be used with many. The manual includes block diagrams of several basic receiver types with indications of where you would look for a connection point. If your radio does not have a countable frequency available at a jack (e.g. an “accessory jack”) you will need to have some understanding of the electronics involved, and an ability to read the schematic diagram for your receiver.
But of course the DD-1 is also set up for use as a stand-alone counter. So if you can find a relevant frequency to count, you can use the DD-1, and often you can program the “digital dial side” of the device to show your operating frequency. The usual problem is that some receiver designs use different LO frequencies for different bands or groups of bands. One solution to that problem is to set up different offsets in the five memories of the DD-1, and selecting them is simply a matter of pressing a front- panel button.

The connection parameters are essentially identical to the AADE DFD1 (which we also sell). Neil provides detailed notes for a number of radios on his web site at

Can I convert my 100A from one band to another?

Monday, January 23rd, 2006

It is possible to convert a 100A from one band to another, but it is not practical. (more…)

Can I build the DD1 into my OHR 500?

Friday, January 20th, 2006

The quick answer is yes– it’s your radio, and your counter, so you can do whatever you want with them. You won’t even void the warranty, unless there is a problem caused by the “modification.” But in fairness, I have to say it is not a real good idea. Let me explain why we don’t offer a digital display as an option, and invite you to reconsider. (more…)