Joe Tracker's

Ham Radio eBay Prices

ham rig
Final auction prices of amateur radio equipment on eBay, compiled by a fellow ham: high, low and average final bids on transceivers, HT's, scanners and more.



Frequently Asked Questions

About eBay Price Tracking

You mentioned the problem of small samples with skewed distributions. So why not use the median instead of the mean?

Can't I get this information from eBay?

Will you research/recommend/advise on a specific purchase?

About "Joe Tracker's" Station

Can I use a tuner like the LDG 100Pro with the type of vertical you built, or do I have to go with an Icom AH-4 mounted at the antenna?

What type of gray PVC pipe will you be using in the next stage of your vertical antenna project? Which "schedule" # and what diameter?

You mentioned that the pipe used for your vertical is 25 feet long but you have only 23.5 feet of wire. From the pics I see the wire is coming out from the bottom. Can you confirm the length of the antenna?

What type of wire are you using for your "flagpole" vertical's control cable. Antenna rotor wire, CAT 5 ethernet cable, or...?

 

About the eBay Price Tracker



You mentioned the problem of small samples with skewed distributions - so why not use the median instead of the mean?
You're right, I do have ambition to report on medians as well as - or instead of - means, but I extract the data from SQL into Excel pivot tables which suprisingly do not support calculating the median. Researching it.

Can't I get this information from eBay?

For quite a long time now (in Internet years, that is) eBay has allowed you to search completed eBay auctions up to fourteen days old for free. This is useful for extremely popular items, like the latest hot-selling two-meter rig.

Most items on eBay don't sell in sufficient quantities to get a clear picture over that period. The only way to get further historical data is to buy it, and currently eBay sells only up to ninety days worth - which is often still not enough for this category - so you would need to purchase more data from an authorized third-party vendor.

Furthermore, the judgment calls I'm making on what to include and how to separate items - used condition, special series, with or without which accessories, etc. - would not be visible in data from any vendor without paying for megabucks custom reporting.

Step-by-step, month-by-month, I'm trying to compile my own database of very specific, very useful historical pricing information. So to answer your question: no, I don't think you're going to be able to find data like this anywhere.


Will you research/recommend/advise on a specific purchase?

In general, if I haven't owned a particular rig I would hesitate to advise you on it. But I will try to answer questions about what caused me to exclude certain auctions or how I decided to divide up certain models into separate listings.

Always happy to talk toys. This research has been fun. But please remember, this is a hobby and I am not in the business of selling data.

I apologize for any delay in my replies. I have this nasty habit of joining early-stage software startups, so as you can imagine sometimes I can disappear for weeks at a time without a moment to spare for ham radio.



About Joe Tracker's Station



Can I use a tuner like the LDG AT-100 Pro with the type of vertical you built, or do I have to go with an Icom AH-4 mounted at the antenna?
No reason why you have to use the Icom tuner, but for best results if you're going to go with LDG Electronics you should use their remote mounting RT-11, not an indoor tuner. You'll also need one of LDG's baluns in-between the RT-11 and the antenna. Even better, use one of the SGC autotuners like the SG-237, they are ideal for this application.

What type of gray PVC pipe will you be using in the next stage of your vertical antenna project? Which schedule number and what diameter?
Gray Schedule 40 is good, Schedule 80 is better.  Both are sunlight resistant, but Schedule 80 has an extra-thick wall.  The best would probably be 2" OD Schedule 80, but it can be unwieldy.  For my first "flagpole" antenna I used more than one diameter because I needed to get the bottom end into the Easy-Up tripod. I connected the sections with size adapters.  I can get more specific, but really you need to decide what muscle power, wind speeds, base/clamps/etc. are going to be involved and then work backwards. 

You mentioned that the pipe used for your vertical is 25 feet long but you have only 23.5 feet of wire. From the pics I see the wire is coming out from the bottom. Can you confirm the length of the antenna?
Yes, 23.5 feet is the length from the tuner to the top of the wire. Every bit of the wire coming out of the tuner radiates, i.e. the antenna begins at the tuner terminal. 23 feet is the minimum length required by the AH-4 tuner. Other lengths can impact the tuner's performance because you don't want it to actually be at resonance with a ham band, so plan carefully. But if you can get it longer, much longer, you'll have better performance on the low bands and might even be able to tune up on 160 meters.

What type of wire are you using for your "flagpole" antenna's control cable? Antenna rotor wire, CAT 5 ethernet cable, or...? 

I have used both inexpensive antenna rotor wire laid across the roof, and irrigation control wire (using four of the five wires) when I ran it underground through irrigation sleeving during some landscaping.

The wires did pick up some RF and brought it back into the shack causing the radio's display to act up, but I just wrapped the wire about ten turns around a ferrite torrid core "doughnut" right behind the radio (next to a line isolator on the coax, by the way) and that took care of it. I also routinely create chokes with the coax near my antennas: for HF verticals, 8' from the antenna I wind both the control cable and the coax ten turns around 10" forms.






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