HBR-2016 HF 160 to 6 meter High Performance All-Mode Transceiver
June 17, 2016: Revision of HBR-2016 has begun.
The HBR-2000 page describes a HF (160 to 6 meters) High Performance Transceiver that I completed in 2000. Last year I decided to begin the process of rebuilding it and named it the HBR-2016. The reason for building the HBR-2016 is I decided to encorporate what I learned since the orginial build, both electrically and construction wise. I wanted it to be smaller in size as well as replace some of the cheap components (mainly relays) that I used in the orginal design. As well, I decided to make all the individual modules more accessible if repairs are needed.
BAND PASS FILTER MODULE:
Here is a photo of the new BPF module.
All the filters used in the HBR-2000 and HBR-2016 were derived using a program listed in the main menu under the Design Page. If you wish access to this program please send me an email.
The new BPF filter modular is smaller in size. The dimenions are 173 mm by 178 mm with a depth of 30 mm. It is 1/3rd smaller than the module in the HBR-2000. As well, some of the individual BPF's encorporate more stages of filtering to achieve improved stop band attentuation. The relays that I had used in the HBR-2000 were cheap and had begun sticking when closed or releasing very slowly. The new relays I chose are OMRON G6S-2-Y12VDC. The relay contacts are listed as being composed of (AG)AU which consist of a silver base and gold shell. Hopefully over a the long term this will reduce the chances of the contacts sticking. As with the original design I include relay contact current wetting to help reduce oxidization of the contacts. Time will tell. W0QE on his web site provides an interesting test that he performed on small signal relays. Click here for his Web Site:
The bottom section of the BPF module photo contains a high Q T notch filter for the IF freq of the transceiver.
HIGH FREQUENCY OSCILLATOR (HFO) GENERATION MODULE :
The following two photo's show the top and bottom sections of the HFO module. It will be seated on top of the BPF module and is the same size except for the depth because it is two sided. One side has ten individual xtal osc. circuits, a double balanced mixer which hetrodynes the selected xtal osc.'s with the VFO to generate the proper injection freq. for both the receiver and the transmitter portions of the transceiver.
BOTTOM SECTION OF THE HFO MODULE
CLOSE UP VIEW OF THE XTAL OSC.'S
The other side contains 10 BPF's for the HFO output followed by an amplifier chain to boost the output level to +17 dBm for the receiver and +7 dBm for the transmitter mixer and freq. counter. Instead of using relays to switch the xtal osc.'s and the HFO BPF's I decided to use diode switches. The average xtal. osc. output level is +6 dBm and the output of the HFO mixer is -20 dBm + or - 0.5 dBm, thus I was not concerned about using diode switching for the osc. and BPF's like we are with the receiver RF input BPF's where signal level can be significantly larger causing 3rd order intermodulation distortion in the diodes. After testing various diodes I decided that the IN4148 small signal switching diodes met my requirement. They are two diodes switches on either side of the BPF's and forward biased at 12 mA's per diode or 48 mA's in totl.
TOP SECTION OF THE HFO MODULE
CLOSE UP VIEW OF HFO AMPLIFIER CHAIN
The HFO output power measures +17 dBm + or - 0.4 dBm for all bands 160 to 6 meters.
1. Receiver Measurements
2. Design Process
3. IF-Detector Module
4. Audio Module
5. VFO and Frequency Control
6. RF Filters
7. Front End, Mixer, Post Mixer Amp and Noise Blanker Gate
8. Front Panel Layout
9. Transmitter 100 Watt Amp.
10. Test Equipment
11. Keeping Records
Published Articles (Copyright ARRL. All rights reserved, used with permission of the ARRL.)