2021-07-01

Home Antenna Considerations, Part 1.

 I am doing some considerations on a re-design of my antennas in and around the house. Right now I have a more or less functioning system, because during the pandemic I have not had the option of people coming to assist in antenna installations. 

The antenna system was due some maintenance the last 2 years, so now is probably the time to get started again.

This is my existing antenna system:

1) RX-ant:

- Active Mini-whip: 10kHz - 25MHz (needs some distribution/filter circuit(s))

- Indoor loop: 500kHz - 30MHz (lower than 500kHz w/amplification?)(needs distribution/filters)

- Loop on ground (30 - 160m, maybe MW/NDB bands w/ amplification?) (needs distribution/filters)


2) TRX-ant:

- R6000 (10 - 20m) (6m poor(RX only?)). In working order, but guy wires need to be replaced.

- Low 5B dipole (10-15-20-40-80m). Not very efficient due to the low height.

- V2000 (6/2m/70cm vertical). This is in working order.

- Corner vertical (mounted at the corner of the garden). This antenna has lost the top. I will have to check if the telescopic fiberglass mast has partly collapsed, or if it is broken. Originally this antenna worked in varying degrees on 160 - 30m, but it has certainly lost the 160m capability. Most definitely needs maintenance or re-design.

- Big Wheel, 2m (could possibly do 70cm) Omnidirectional, horizontal polarisation. This is generally in working order, but in rainy conditions it seems to deteriorate. Probably leaking, so needs maintenance.

- 10m 1/2 wave antenna. In working order.

- Low 2m/70cm vertical w/lossy cable. 


I am trying to make the antenna system as unobtrusive as possible, still with the functionality I want, so here are some requirements:


TRX Operation possible on following bands:
- preferably a possibility og making at least one QSO on 2200 and 630m. This may be tricky, but should be tested.
- 10 - 160m, reasonably well.
- 10m good (minimum as good as a vertical 1/2 wave).
- 4/6m needs to be improved (probably with Moxon, capable of running more power)
- 2m added gain, horizontal
- 70cm horizontal gain
- 23cm vertical and horizontal w/ some gain
- 13cm vertical and horizontal w/ some gain
- 9cm ???
- 6cm (maybe "14dB" patch array)
- 3cm 15/17dB horn or small (35cm?) dish
- probably some antennas should be capable of more than one band.

Diverse RX antennas: 
- Mini-Whip (2 pcs?). Will need distribution/filters
- Indoor WB loops for MW/HF. Will need distribution/filters
- Outdoor WB loop for MW/HF. Will need distribution/filters
- Outdoor loop for MF/LF(/VLF?). Will need distribution/filters
- Loop on ground antenna for MF/low HF bands. Will need distribution/filters
- other possible RX antennas may be considered, e.g. 4/6/10m RX antenna, 137/145/250MHz, 432MHz, 23/13/3cm monitor antennas.


I do have some ideas, but I think I will have to take yet another look at the garden and assess the possible solutions, so this is all for today.

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