Originally Posted by Floydage For the less workshop-inclined they could buy one of those mini fans to turn on and point at the box while it's on.
I caught one on sale for $5 and it has an adjustable frame. Also make sure the box isn't too close to any other warm electronics.
Speaking of fans I discovered a conducted problem with the Zinwell 970A when a fan is on the same circuit (or I suspect any other motor, inductive, transient-generating device). The Zinwell goes nuts on a VHF channel if I turn the fan on or change the fan speed. It works fine after I retune the station and as long as I don't change the fan speed. I suspect a better wall-wart/power supply or a big capacitor on the output of the wall-wart would do the trick. Hopefully the Pals don't have this problem but...
Didn't most of the CECBs have 90 day warranties? I saw a few with 1 year part-only warranties but don't see the point in that if it has to be repaired at an authorized service center that's going to nail ya for more than more than the box is worth. Anyhow I don't think all the CECBs were designed based on a 90 day warranty, rather the price of the boxes didn't warrant longer terms. Much of the design for reliability and mfg in a product like this is standardized these days. I was impressed with some of the guts I've seen on these threads but can't speak for all the CECBs. A hot box is a concern though. Do the Pals have built-in power supplies?
I forgot about the credit card warranty extensions, thanks for reminding me!
Adding fans:1: Fans won't do anything on the DTVPal series units- the housing is TOTALLY sealed... There is NO airflow thru the unit, NONE. UNIT IS TOTALLY SEALED.
2: While I'm a big fan of anything that will increase performance, longevity, or stability and all kinds of hacks... Fans added in after the unit is UL rated, especially the cheaper you go are a fire hazard, something else to replace /point of failure /operational ,RF noise, another power brick to add to power bill, and or load on A/C system while in use/phantom load when not being used... also a issue for those with pets, small children. Can also be a issue if say a FIRE
3: Passive design (Cooling holes /slots)= No moving parts.... While it can be argued that drilling holes in the case might be viewed by those looking to void a insurance claim as in the case of FIRE, adding passive cooling to a device (if done tastefully-EG: appearing factory) is far less likely to be seen as a contributing factor to the cause of a fire.
4: Not to be argumentative and I fully understand that adding external fans may be for some the extent of their workshop abilities, but fans (Unless it's 25hp) won't cool a non-modified unit enough to make a difference.
With the case being so easily opened (pops open in about a minute) and only basic tools required to drill some holes it's a no brainer when you consider *passive vs active cooling pros and cons. FireMarshalls, inspectors, investigators take a very dim view of things that don't look stock/factory/to code if they are called in (EG: A fire). External, additional fans, wiring of such unless it's done to military spec could get you into deep legal /financial do-do... real quick.
Warranty- How it influences design, spec of components:
Yep, most CECB's had a 90-day warranty, And yes the price figured into the warranty length.
On 90-day warranties being the standard- And that lovely out of parts only, not labor on 1-year warranties..
1: 90-days is a joke- Customer having to pay return shipping on DOA items is a insult as well- in those cases it occurs. (Mfg should eat it)
1-year should be considered the minimum... parts and labor. (See #2)
(Yes I understand cost concerns to manufacturer. DTVPal was for me= the most expensive box(s) per unit after the coupon was applied so they should have had a 1-year at min = See #2 below.)
2: Most failures on electronics occur within the first 30-days-, or YEARS into ownership. So going to 1-year statistically is NOT a issue, that is if you're not making (or designing) junk /sub-standard equipment.
3: Longevity... Costs.... As you know manufacturers look at cost of each component and will try to save money whenever they can. "Warranty length", the period of to me implies how much faith the manufacturer has in their product.
4: RE: A hot box is a concern though. Do the Pals have built-in power supplies?DTVPal, Echo TR-40 has NO AIRFLOW MOVEMENT THRU THE CASE and is TOTALLY SEALED as designed and marketed. (None needed to get you to 90-days....)
DTVPal uses a external power supply. (Which is good so far as heat generated inside the case as you know)
Other units with external power supplies have cooling slots, Zinewell 970, Artec (model ID escapes me) as a example.
Anytime you reduce temps you increase lifespan,.... as you probably already know.
* Depending on location-(EG: The tropics, Desert) active cooling may be desirable over passive.
DTVPal series cooling options:
A: Drill holes in case=Passive
B: Drill holes/ or slots in case-point external fan at modified case.
C: Mount a fan directly on/in case.
D: Remove top cover and point fan towards bare PCB board to provide air movement.
E: For hard core mod types... the ultimate.... Use liquid cooling....
In all cases to reduce operating temps the "case", regardless of Passive or active needs to be modified in some way.